GB2432686A

GB2432686A - Accelerated file scanning for spyware/malware

Info

Publication number: GB2432686A
Application number: GB0523996A
Authority: GB
Inventors: Jonathan L Edwards
Original assignee: McAfee LLC
Current assignee: McAfee LLC
Priority date: 2005-11-25
Filing date: 2005-11-25
Publication date: 2007-05-30
Anticipated expiration: 2025-11-25
Also published as: GB2432686B; GB0523996D0

Abstract

A method for scanning files for spyware and malware comprises identifying file names in a registry of at least one computer 602 and then scanning files associated with the file names 604. Since malware and spyware often manipulate the registry to ensure they are run by the operating system, the method scans all software that utilizes the registry in any manner. In another method a scan 654 is conditionally performed based on whether a change in the registry has been identified 652. In another method a scan may be scheduled e.g. on a periodic basis (701, fig. 7), or prompted by a change in the registry (702). Duplicate file names found in the registry may be removed prior to the scan (704, 710). The time required for performing the scan may be less than the time required for scanning files on hard-disks of the computer.

Description

SYSTEM, METHOD AND COMPUTER PROGRAM PRODUCT FOR ACCELERATING

MALWARE/SPYWAR.E S CANN[NG RELATED APPLICATION(S).

The present application is a continuation-in-part of an application filed September 27, 2004 under application serial number 10/952,039, and which is incorporated herein by reference.

FiELD OF THE INVENTION

The present invention relates to computer/network scanning, and more particularly to scaiming for spyware and/or maiware.

BACKGROUND

In the space of just over a decade, the Internet, because it provides access to information, and the ability to publish information, in revolutionary ways, has emerged from relative obscurity to international prominence. Whereas, in general, an internet is a network of networks, the Internet is a global collection of interconnected local, mid-level, and wide-area networks that use the Internet Protocol (IP) as the network layer protocol. Whereas the Internet embraces many local-and wide-area networks, a given local-or wide-area network may or may not form part of the Internet.

As the Internet and its underlying technologies have become increasingly familiar, attention has become focused on Internet security and computer network security in general. With unprecedented access to information has also come unprecedented opportunities to gain unauthorized access to data, change data, destroy data, make unauthorized use of computer resources, interfere with the intended use of computer resources, etc. These opportunities have been exploited time and time again by many types of maiware including, but is not limited to computer viruses, worms, Trojan horses, etc. As experience has shown, the frontier of cyberspace has its share of scofflaws, resulting in increased efforts to protect the data, resources, and reputations of those embracing intranets and the Internet.

Recently, some new types of software have emerged, collectively called "spyware" Spyware, while not as malicious as the aforementioned conventional viruses, Trojan horses, etc., may still cause problems for computer users. For example, spyware may he designed to log keystrokes, track which websites a computer user visits, and/or transmit personal information to a third party.

In the context of the present description, the term spyware is further deemed to include other related types of similar software such as adware, dialer software, other equivalents, and/or any other software that is less malicious than conventional malware.

For example, adware is typically designed to download and display advertisements on a screen of a computer, and can be very intrusive. Dialer software, on the other hand, is designed to redirect a dial-up Internet Service Provider (ISP) connection of a computer to a different, more expensive phone number, in exchange for access to something, typically pornography.

Often, this software is marketed as legitimate applications which the computer user ostensibly installs willingly. For example, a free music player application may be come bundled with adware and require that the adware be installed before the music player application will work. The owner of the adware conventionally pays the owner of the music player to include the adware Although some of these examples of spyware border on legitimacy, many of these applications are poorly written, and cause compatibility problems with other software. Moreover, spyware can be very intrusive, waste network bandwidth, and cause a slew of other problems.

While the distinguishing feature of ma]ware such as a computer virus is still that it replicates from file to file, such maiware has evolved from simply being pieces of code that replicate into tools to enable more targeted violations of computer security.

This trend is seen most clearly in the existence of "zombie" networks. These networks come into being when a virus infects many computers which all then communicate to the malware author awaiting commands. Once the network is in place, it can be used for many nefarious deeds including launching denial of service attacks, sending SPAM, etc. As computer systems are become more and more complicated and associated disks contain more and more files, an increasing amount of time is needed to scan all these files in order to detect spyware and/or maiware. On some large file servers containing many terabytes of data, such time to perform a complete scan can exceed one week. Unfortunately, it is often necessary to be able to detect spyware and/or malware in a much more expeditious manner.

Further, it is sometimes beneficial for a maiware and/or spyware scanner product to contain a true "on-access scanner," which scans files the instant they are created.

Unfortunately, it is sometimes not possible for some products to incorporate such an on-access scanner. In these cases, the system is only protected by "on-demand scanning," which is a scan that is run per a certain schedule, for example, once per day. Because such scanning happens infrequently, there is a sizeable window of opportunity for spyware and/or maiware to cause harm.

There is thus a need for overcoming these and/or other problems associated with

the prior art.

SUMMARY

According to an aspect of the present invention, there is provided a method for scanning files, comprising: identifying a plurality of file names in a registry of at least one computer; and scanning files associated with the file names.

According to another aspect of the present invention, there is provided a computer program product embodied on a computer readable medium for scanning files, comprising: computer code for identifying a plurality of file names in a registry of at least one computer; and computer code for scanning files associated with the file names.

According to a further aspect of the present invention, there is provided a system for scanning files, comprising: means for identifying a plurality of file names in a registry of a t least one computer; and means for scanning files associated with the file names.

According to a further aspect of the present invention, there is provided a method, comprising: identifying a change in a registry of at least one computer; and conditionally performing a scan based on whether the change in at least one said registry is identified.

According to a further aspect of the present invention, there is provided a computer program product embodied on a computer readable medium, comprising: n computer code for identifying a change in a registry of at least one computer; and computer code for conditionally performing a scan based on whether the change in the registry is identified.

According to a further aspect of the present invention, there is provided a system, comprising: means for identifymg a change in a registry of at least one computer; and means for conditionally performing a scan based on whether the change in the registry is identified.

According to a further aspect of the present invention, there is provided a method, comprising: determining whether a scan is scheduled; if it determined that the scan is scheduled: identifying a plurality of file names in a registry of at least one computer, removing duplicate file names in the registry of at least one said computer, and scanning files associated with the file names for spyware and malware; identifying a change in the registry of at least one said computer; and if the change in the registry is identified: identifying the file names in the registry of at least one said computer, removing the duplicate file names in the registry of at least one said computer, scanning the files associated with the file names for spyware and malware, scanning the registry for predetermined keys, and removing the predetermined keys. n

A system, method and computer program product are provided for scanning files. A plurality of file names in a registry of a computer is initially identified. By this identification, files associated with the file names are scanned.

in one embodiment, the file names may be identified utilizing a predetermined format associated therewith. Such format may include a path. Further, in use, duplicate file names may be removed. To this end, spyware (adware, spyware, etc.) and/or maiware may be more effectively detected.

Another system, method and computer program product are provided. In particular, a change in a registry of a computer is first identified. Then, a scan is conditionally performed based on whether the change in the registry is identified.

In one embodiment, the registry may be continuously monitored for identifying the change. As a further option, a separate scheduled scan may be performed on a periodic basis. Thus, the conditional scan may be performed prior to the scheduled scan. Further, the conditional scan may he performed in parallel with the scheduled scan.

In yet another embodiment, the conditional scan may include scanning the registry. Such scanning of the registry may include scanning the registry for at least one predetermined key. Such predetermined key may thus be deleted upon the detection thereof.

In still yet another embodiment, the conditional scan may include scanning at least one file. In one aspect of the present embodiment, the change that is identified may include a change to any file name in the registry. Thus, the file to be scanned may include only files associated with the changed file name in the registry. In another ernbodiment the conditional scan may include scanning all of the files identified i.n the registry.

To this end, the time required for the scarming may be less than the time required for scanning files stored on harddisks of the computer.

In one embodiment, the registry may include a location on the computer for storing information including hardware that is attached to the computer, system options that have been selected, a configuration of memory of the computer, and/or application programs to be present when an operating system of the computer is started.

Strictly as an option, the present technology may further he utilized to counter terroriSm.

BRIEF DESCRIPTiON OF THE DRAWINGS

Figure 1 illustrates a network architecture, in accordance with one embodiment.

Figure 2 shows a representative hardware environment that may he associated with the data server computers and/or end user computers of Figure 1, in accordance with one embodiment.

Figure 3 illustrates a method ftr scanning for spyware utilizing a virus scanner, in accordance with one embodiment.

Figures 4A -4B illustrate a method for scanning for spyware utilizing a virus scanner, in accordance with another embodiment.

Figure 5 illustrates an exemplaiy graphical user interface for scanning for spyware utilizing a virus scanner, in accordance with one embodiment.

Figures 6A -6B illustrate methods for combating spyware, maiware, etc., in accordance with one embodiment.

Figure 7 illustrates a method for combating spyware, malware, etc., in accordance with another embodiment.

DETAILED DESCRIPTION

Figure 1 illustrates a network architecture 100, in accordance with one embodiment. As shown, a plurality of networks 102 is provided. In the context of the present network architecture 100, the networks 102 may each take any form including, but not limited to a local area network (LAN), a wide area network (WAN) such as the Internet, etc. Coupled to the networks 102 are data server computers 104 which are capable of communicating over the networks 102. Also coupled to the networks 102 and the data server computers 104 is a plurality of end user computers 106. In order to facilitate communication among the networks 102, at least one gateway or router 108 is optionally coupled therehetween.

It should he noted that each of the foregoing network devices in the present network architecture 100, as well as any other unillustrated hardware and/or software, may he equipped with various security features. For example, the various data server computers 104 and/or end user computers 106 may be equipped with security functionality in the form of a virus scanner, etc. for purposes that will be set forth hereinafter in greater detail. More infonnation regarding optional functionality and architectural features will now be set forth for illustrative purposes Figure 2 shows a representative hardware environment that may be associated with the data server computers 104 and/or end user computers 106 of Figure 1, in accordance with one embodiment. Such figure illustrates a typical hardware configuration of a workstation in accordance with one embodiment having a central processing unit 210, such as a microprocessor, and a number of other units interconnected via a system bus 212. n -li-

The workstation shown in Figure 2 includes a Random Access Memory (RAM) 214, Read Only Memory (ROM) 216, an I/O adapter 218 for connecting peripheral devices such as disk storage units 220 to the bus 212, a user interface adapter 222 for connecting a keyboard 224, a mouse 226, a speaker 228, a microphone 232, and/or other user interface devices such as a touch screen (not shown) to the bus 212, communication adapter 234 for connecting the workstation to a communication network 235 (e.g., a data processing network) and a display adapter 236 for connecting the bus 212 to a display device 238.

I 0 The workstation may have resident thereon any desired operating system. It will be appreciated that an embodiment may also be implemented on platforms and operating systems other than those mentioned. One embodiment may be written using JAVA, C, and/or C++ language, or other programming languages, along with an object oriented programming methodology. Object oriented programming (OOP) has become increasingly used to develop complex applications.

Our course, the various embodiments set forth herein may be implemented utilizing hardware, software, or any desired combination thereof. For that matter, any type of logic may be utilized which is capable of implementing the various functionality set forth herein.

Figure 3 illustrates a method 300 for scanning for spyware utilizing a virus scanner, in accordance with one embodiment. As an option, the present method 300 may be implemented in the context of the architecture and environment of Figures 1 and/or 2. Of course, however, the method 300 may he carried out in any desired environment.

In operation 302, at least one computer (e.g. see computers 104, 106 of Figure 1, for example, etc.) is scanned for viruses utilizing a virus scanner. In the context of the present description, the term virus scanner may include any hardware, software, and/or -12-logic that is capable of at least detecting viruses and, optionally, any other type of malware, Further in the context of the present description, maiware (i.e. "malicious software") may refer to any programming or files that are developed for the purpose of doing harm to a computer and/or network components. Thus, maiware may include, but is not limited to various forms of computer viruses, worms, Trojan horses, etc. Further, in operation 304, the computer is further scanned for spyware utilizing the virus scanner. Again, in the context of the present description, the term spyware is deemed to include spyware, adware, dialer software, other equivalents, and/or any other software that is less malicious than conventional malware, etc As shown in Figure 3, the spyware and virus scanning may take place in parallel.

Of course, it should be noted that such spyware and virus scanning may be performed in parallel, in series, simultaneously, separately, etc., as long as the virus scanner is carrying out such scanning. While any of the foregoing options are possible, there may he a performance impact when spyware scanning is run simultaneously with virus scanning. Thus, separate scannmg for spyware and viruses may be employed to prevent such performance impact.

Further, it should be noted that the spyware scanning should be deemed to be carried out by the virus scanner, even if only a sub-component, related component, etc. of the virus scanner is canying out such spyware scanning. For example, it is conceivable that a comprehensive virus scanner may be equipped with a spyware component via an "upgrade," "update," etc. Still yet, the virus scanner may he part of a large single system (e.g. an enterprise system with a firewall, intrusion detection capabilities, etc.), which further includes a spyware scanning capability. Even still, the virus scanner may simply be sold with the spyware scanning capability, as a single system. in each of these instances (as well as others not explicitly set forth), the spyware scanning capability is deemed to he provided, at least in part, "utilizing the virus scanner.' n -13-In use, the computer is scanned for the spyware by scanning a registry associated therewith. Note operation 306. Spyware, in many (hut not all) instances, may alter the registry in some way, thus making registry scanning an effective technique for detecting spyware.

In one embodiment, the registry may include a location on the computer for storing information such as hardware that is attached to the computer, system options that have been selected, a configuration of memory of the computer, and/or application programs to be present when an operating system of the computer is started. [n the specific context of the Microsoft Windows operation system, the registry may include the sections noted in Table 1.

Table I

* HKEY Classes Poot -file associations and OLE inforrnati on * EKE? Current User -all preferences set for current user * EKE? User -all the current user information for each user of the system * HKEY Local Machine -. settings for hardware, operating system, and installed applcations * EKE? Current Configuration -settings for the display and printer s * EKE? Dyn Uata -performance dat.a Of course, in the context of the present description, the registry may include any data used by an operating system to store configuration information. -14-

More information will now be set forth regarding one exemplary embodiment utilizing various optional features each of which may (or may not) be incorporated with the foregoing method 300 of Figure 3, per the desires of the user.

Figures 4A -4B illustrate a method 400 for scanning for spyware utilizing a virus scanner, in accordance with another embodiment. As an option, the present method 400 may be implemented in the context of the architecture and environment of Figures 1 and/or 2, and even the method 300 of Figure 3. Of course, however, the method 400 may be carried out in any desired environment.

With reference first to Figure 4A, a first list of items is displayed in operation 402. Such first list may include items associated with a computer (e.g. see computers 104, 106 of Figure 1, for example, etc.) which are currently being scanned. Thus, the first list may operate to identify and track which items of the computer are being 1 5 scanned during use of the virus scanner.

In use, it is determined whether an add icon has been selected by a user. Note decision 404. As will soon become apparent, the add icon allows the user to add additional items to the first list, thus ensuring that such additional items are included in a scan. To this end, upon detection of the selection of the icon by the user, a second list of items is displayed. Note operation 406. Such second list includes items associated with the computer which are capable of being scanned (and not already being scanned per the first list). Moreover, such second list of items includes a registry of the computer, for scanning for spyware, as will soon become apparent.

It is then determined in decision 408 whether the user selects the registry in the second list. Upon the detection of the selection of the registry in the second list (as determined in decision 408), the registry is moved from the second list to the first list.

Note operation 410. Movement of the registry in such manner thus provides a technique for optionally allowing the registry to be scanned for detecting spyware n -15-While the method 400 has set forth a technique for including spyware scanning (by movement of the registry item from the second list to the first list), it should be noted that a remove button may also he used to disable spyware scanning (by movement of the registry item from the first list to the second list). To this end, the registry associated with the computer may be conditionally scanned based on user input. More information regarding an exemplary graphical user interface for facilitating the forgoing functionality will he set forth hereinafter in greater detail.

In decisions 409 and 411, it is determined whether a scan should take place. Of course, such determination may take any form based on whether the scanner is an on-demand, on-access, etc. scanner. If it is determined in decision 411 that a scan should take place, the registiy of the computer is scanned for detecting spyware, utilizing the virus scanner (since the registry was moved to the first list, etc.). Note operation 412.

As an option, a user interface that indicates, in real-time, when and what is being scanned, may be updated to indicate the registry, during operation 412. If, however, it is determined in decision 409 that a scan should take place, the registry of the computer is not scanned for detecting spyware (since the registly was not moved to the first list, etc.).

In any case, if it is determined in either decision 409 or 411 that a scan should take place, the computer is scanned fhr viruses, utilizing the virus scanner. See operation 450 of Figure 4B.

With continuing reference to Figure 4B, it is determined in decision 451, whether an update event is detected. Of course, such update event may he manually initiated and/or automatically initiated by a client and/or server based Ofl a periodic basis, predetennined scheduling, etc. Upon the detection of the update event, both virus signatures and spyware signatures associated with the virus scanner are updated. Note operation 452. -16-

As an option, the spyware signatures and virus signatures of the virus scanner may be updated via a network (e.g. see, for example, networks 102 of Figure 1, etc.).

More particularly, the spyware signatures and virus signatures of the virus scanner may be updated together and/or simultaneously. By coordinating the updating of the virus and spyware signature updates, updating mechanisms need not be duplicated.

Moreover, any overlap in the signatures themselves can be eliminated. Table 2 illustrates an exemplary log of an illustrative update process.

Table2

Updating Virus Signìatures Downloading DAT4 390. ZIP Installing 4390 Signatures Updating AntiSpyware Signatures Downloading SPY3820.ZlP Installing 3820 Signatures Figure 5 illustrates an exemplary graphical user interface 500 for scanning for spyware utilizing a virus scanner, in accordance with one embodiment. As an option, the present interface 500 may be implemented in the context of the architecture and environment of Figures 1 and/or 2, and even the methods 300 and 400 of Figures 3 - 4B. Of course, however, the interface 500 may be carried out in any desired environment.

As shown, a graphical user interface 500 is provided which may be displayed in an options menu associated with a virus scanner Specifically, such interface 500 may be displayed UPOfl a user initiating the options menu while using the virus scanner. As mentioned earlier, the interface 500 may include a field for receiving the user inpul for controlling the virus scanner with respect to spyware scanning. -17-

Specifically, such field of the graphical user interface 500 may include a first list 504 of item.s associated with the computer. Such first list 504 may include items associated with the computer which are being scanned.

Associated therewith is a second list 506 that may he displayed upon the selection of an icon (eg. an "add" icon, etc.). Such items of the second list 506 may include the registry 508. Further, the items of the second list 506 may include additional items associated with the computer which are capable of being scanned upon the selection thereof. As shown, such items may further include local drives, fixed 1 0 drives, removable drives, network drives, running processes, a user profile folder, and/or a recycle bin.

In use, the items of the second list 506 may be moved to the first list 508 upon the selection thereof, as set forth earlier. To this end, duplication of options, updating, etc. between the virus and spyware scanning is removed.

Thus, the present embodiment is capable of exploiting the similarities of virus and spyware scanning for removing duplication, etc. For example, at a high level, a virus scanner often needs to examine various parts of the computer to look for suspicious files or configuration data. Still yet, reports of what has been found and cleaned sometimes need to be generated and correlated so that an administrator can track anomalies in an organization. Spyware, like new viruses, is continuously being written, so analysis of new samples may be needed and the results of this analysis may need to get to the computers running the scanner in the form of periodic updates to signatures, etc. Of course, the virus scanner may account for the differences between virus and spyware scanning, to accommodate the same. Reporting may require a different level of granularity and urgency. With a virus, many files may he infected with the virus. With spyware, on the other hand, there is often just once instance installed, hut it may consist -18-of different files and registry entries. A virus outbreak is also much more serious than spyware being found. Spyware is typically less malicious and does not actively try to spread from computer to computer (in most cases). Generating instant alerts and responses may thus be applied to virus scanning, hut may he avoided during spyware scanning in some situations.

Still yet, a new vims may be released and spread around the world in minutes.

A mechanism for extremely fast deployment of new signatures for detection may thus be important when virus scanning. Spyware, on the other hand, spreads slowly, is less malicious, and is easier to remove when detected. Therefore, the frequency/number of updating instances of the spyware signatures may be less than virus signature updates, in one embodiment.

More information will now be set forth regarding one exemplary embodiment utilizing various optional features each of which may (or may not) be incorporated with the foregoing technology of Figures 1-5, per the desires of the user.

Figures 6A -6B illustrate methods 600, 650 for combating spyware, ma]ware, etc., in accordance with one embodiment. As an option, the present methods 600, 650 may be implemented in the context of the architecture and environment of Figures 1 and/or 2, as well as the functionality of Figures 3 -5, and the descriptions thereof. Of course, however, the methods 600, 650 may he caiTied out without any of the previously disclosed features, and/or in any other desired environment.

As shown in Figure 6A, the method 600 is provided for scanning files.

Specifically, in operation 602, a plurality of file names in a registry of a computer (e.g. see computers 104, 106 of Figure 1, for example, etc.) is identified.

As mentioned earlier, in one embodiment, the registry may include alocation on the computer fur stonng information such as hardware that is attached to the computer, -19-system options that have been selected, a configuration of memory of the computer, and/or application programs to be present when an operating system of the computer is started. In the specific context of the Microsoft Windows operation system, the registry may include the sections noted in Table 1 above. Of course, in the context of the present description, the registry may include any data used by an operating system to store configuration information.

By this identification, files associated with the file names are scanned. Note operation 604. Thus, any files with associated file names in the registry are scanned.

Since maiware, spyware, etc. often manipulate the registry so as to ensure that such software is run by the operating system (as well as to support other functionality), the present method 600 ensures that any such software that utilizes the registry in any manner is scanned, and managed accordingly.

Moving to Figure 6B, another method 650 is provided. As shown, a change in a registry of a computer (e.g. see computers 104, 106 of Figure 1, for example, etc.) is first identified. See operation 652. This change can be identified in any desired way that identifies any difference in the registry at one particular time, with respect to another.

Then, in operation 654, a scan is conditionally performed based on whether the change in the registry is identified Such scan may include any scan that is capable of identifying any malware, spyware, etc. that may have caused the change. Again, maiware, spyware, etc. often manipulate the registry so as to ensure that such software is run by the operating system, as well as to support other functionality. The present method 650 ensures that any such change prompts a scan, so that remedial measures may he optionally taken.

More information will now he set Iorth regarding one exemplary embodiment utilizing VTiOUS optional features each of which may (or may not) be incorporated with 7) -20 -the foregoing methods 600, 650 of Figure 6A-6B, per the desires of the user. As will ocrn be set forth, the following embodiment incorporates an optional combination of the foregoing methods 600, 650 of Figure 6A-6B.

Figure 7 illustrates a method 700 for combating spyware, maiware, etc., in accordance with another embodiment. As an option, the present method 700 may be implemented in the context of the architecture and environment of Figures 1 and/or 2, as well as the functionality of Figures 3 -6B, and the descriptions thereof. Of course, however, the method 700 may be carried out without any of the previously disclosed features, and/or in any other desired environment.

As shown, decisions 701 and 702 (and the following respective operations) may operate in parallel. Of course, in another embodiment, serial or at least partia] serial operation may also be implemented. With respect to decision 701, it is first determined whether a scan is scheduled. Such scheduling may be automatic, on periodic basis, or performed by a local user and/or remote administrator, in any case, if it is determined that a scan is scheduled per decision 701, various operations are performed.

First, in operation 703, a plurality of file names is identified in a registry of a computer (e.g. see computers 104, 106 of Figure 1, for example, etc.) File names may be identified based on a particular format associated therewith. In particular, file names often have a small number of allowable forms. For example, a computer running Microsoft Windows includes file names that take the following form: <drive letter><colon><backslash><path><naflle> (e.g. c:\program uiles\spyware.exe, etc.). Of course, there are other allowable forms, but only a few exist and they are all as well defined, Thus, it is possible to distinguish file names from other arbitrary alphanumeric data.

Next, in operation 704, duplicate file names in the registry are removed. Thus, only one instance of each file name remains. Thereafter, files associated with the file -21 -names are scanned for spyware and/or maiware, etc. See operation 706. As an option, the location of the files may be determined using the file names and associated path information.

To this end, the time required for performing the aforementioned scan may be less than the time required for scanmng files stored on harddisks of the computer, as other on-demand scanners typically require. In one example involving a typical system, it may take about 10 seconds to extract data from the registry providing a list on the order of 1000 files, which takes around 1 minute to scan.

With reference now to decision 702, a change in the registry is identified.

Again, this change can be identified in any desired way that identifies a difference in the registry at one particular time, with respect to another. Of course, other specific changes may be monitored. For example, changes involving file names may be specifically monitored, if desired.

In one embodiment, the registry may be continuously monitored for identifying the occurrence of a change. Thus, the conditional scan may be performed prior to the scheduled scan. In other words, the conditional scan may be performed at any time, while the scheduled scan may occur at specific time intervals, etc. If the change in the registry is identified, various operations maybe earned out.

For example, similar to operations 703-706, a plurality of file names may be identified in a registry of a computer. See operation 708. Next, in operation 710, duplicate file names in the registry are removed. Thereafter, files associated with the file names are scanned for spyware and/or malware, etc. See operation 712.

In the present embodiment, however, various additional options/variations may be employed, in view of the detection of a specific change in decision 702. For example, the file names identified in operation 708 may either include all of the file -22 -names in the registry, only the file name(s) that was the subject of the change identified in decision 702, and/or a combination thereof.

Further, as either a supplement or substitute for operations 708-712, the registiy itself may be scanned in operation 714, in reaction to the detection of a change therein.

Such scanning of the registry may further include scanning the registry for at least one predetermined key. Such predetermined key may thus be deleted upon the detection thereof. More information relating to such predetermined key will be set forth hereinafter in the context of an illustrative example of operation. It should thus he noted that any desired scanning (even that set forth during the description of Figures 3 -6B) may he used after decision 702.

In one particular example involving a Microsoft Windows operating system, spyware can write the name thereof to HKEY_CLASSES_ROOT\CLSID\{a random nurnber}. Because there are numerous random numbers the spyware can choose and this key is heavily used, it is sometimes inefficient to monitor such area directly.

Moreover, just writing the file name in this area is not sufficient in terms of getting the operating system to run the spyware. However, one other requirement for the spyware may involve writing the same random number to a specific key such as HKEYLOCAL_MACHIN E\software\microsoft\windOWs\cUlTefltVersiofl\eXPlorer\bro wser helper objects. It may thus be very efficient to monitor such single key for changes in the aforementioned manner.

Because the spyware (and much rnalware, for that matter) needs to run all the time and not just when the user chooses the spyware to run, the spyware may need to find a way to coerce the operating system into running the same, for example, when the computer is actuated. On the Microsoft Windows operating systems, this procedure involves setting a value at some place in the registry which points to one of the spyware application files. For example, there is a key called l-IKLM\Softwarc\Microsoft\WindoWS\CurrefltVerSiOn\Rufl. If a value is created in -23 -association with such key which contains the name of an executable file (e.g. the spyware executable, etc.), the operating system automatically runs such executable file when a user logs on to the computer. Thus, by monitoring such area for changes in the aforementioned manner, a procedure may he provided for exploiting the foregoing technique for the purpose of improved scanning.

In one embodiment, terrorism may he countered utilizing the aforementioned technology. According to the U.S. Federal Bureau of Investigation, cyber-terrorism is any "premeditated, politically motivated attack against information, computer systems, computer programs, and data which results in violence against non-combatant targets by sub-national groups or clandestine agents." A cyber-terrorist attack is designed to cause physical violence or extreme financial ham. According to the U.S. Commission of Critical Infrastructure Protection, possible cyberterrorist targets include the banking industry, military installations, power plants, air traffic control centers, and water systems. Thus, by optionally incorporating the present technology into the cyber-frameworks of the foregoing potential targets, terrorism may he countered by preventing the infection thereof with maiware, which may potentially cause extreme financial harm.

While various embodiments have been described above, it should be understood that they have been presented by way of example only, and not limitation. For example, any of the network elements may employ any of the desired functionality set forth hereinabove. Thus, the breadth and scope of a preferred embodiment should not be limited by any of the above-described exemplary embodiments, hut should be defined only in accordance with the following claims and their equivalents.

Claims

-24 -

CLAIMS

1. A method for scanning files, comprising: identifying a plurality of file names in a registry of at least one computer; and scanning files associated with the file names.

2. The method as recited in claim 1, wherein the file names are identified utilizing a predetennined format associated therewith.

3. The method as recited in claim 2, wherein the format includes a path.

4. The method as recited in claim 3, wherein the path includes a drive letter.

5. The method as recited in any one of the preceding claims, wherein duplicate file names are removed.

6. The method as recited in any one of the preceding claims, wherein the files are scanned for malware.

7. The method as recited in any one of the preceding claims, wherein the files are scanned for spyware.

8. The method as recited in claim 7, wherein the spyware includes adware.

9. The method as recited in claim 7 or 8, wherein the spyware includes dialer software -25 - 10. The method as recited in any one of the preceding claims, wherein a first time required for the scanning is less than a second time required for scanning files stored on harddisks of at least one said computer.

11. The method as recited in any one of the preceding claims, wherein the registry includes a location on at least one said computer for storing information selected from a group consisting of hardware that is attached to the computer, system options that have been selected, a configuration of memory of the computer, and application programs to be present when an operating system of the computer is started.

12. The method as recited in any one of the preceding claims, wherein the registry includes a location on the at least one computer for storing information including hardware that is attached to the computer, system options that have been selected, a configuration of memory of the computer, and application programs to be present when an operating system of the computer is started.

13. The method as recited in any one of the preceding claims, wherein the method is utilized to counter teiTorism.

14. A computer program product embodied on a computer readable medium for scanning files, comprising: computer code for identifying a plurality of file names in a registry of at least one computer; and computer code for scanning files associated with the file names.

15. A system for scanning files, comprising: means for identifying a plurality of file names in a registry of at least one computer; and means for scanning files associated with the file names.

-26 - 16. A method, comprising: identifying a change in a registry of at least one computer; and conditionally performing a scan based on whether the change in at least one said registry is identified.

17. The method as recited in claim 16, wherein a scheduled scan is performed on a periodic basis.

18. The method as recited in claim 17, wherein the conditional scan is performed prior to (he scheduled scan.

1 9. The method as recited in claim 1 7 or 18, wherein the conditional scan is performed in parallel with the scheduled scan.

20. The method as recited in any one of claims 16 to 19, wherein at least one said registry is continuously monitored for identifying the change.

21. The method as recited in any one of claims 16 to 20, wherein the conditional scan includes scanning at least one said registry.

22. The method as recited in any one of claims 16 to 21, wherein the scanning of at least one said registiy includes scanning at least one said registry for at least one predetermined key.

23. The method as recited in claim 22, wherein the at least one predetermined key is deleted upon the detection thereof.

24. The method as recited in any one of claims 16 to 23, wherein the conditional scan includes scanning at least one file.

-27 - 25. The method as recited in claim 24, wherein the conditional scan includes scanning each of a plurality of files identified mat least one said registry.

26. The method as recited in claim 24 or 25, wherein the change includes a change to any file name in at least one said registry.

27. The method as recited in claim 26, wherein the at]east one file includes only files associated with a changed file name.

28. The method as recited in any one of claims 16 to 27, wherein the scan includes scanning for malware.

29. The method as recited in any one of claims 16 to 28, wherein the scan includes scanning for spyware.

30. The method as recited in claim 29, wherein the spyware includes adware.

3.1. The method as recited in claim 29 or 30, wherein the spyware includes dialer software.

32. The method as recited in any one of claims 16 to 31, wherein a first time required for the scan is less than a second time required for scanning files stored on harddisks of at least one said computer.

33. The method as recited in any one of claims 16 to 32, wherein at least one said registmy includes a location on at least one said computer for storing information selected from a group consisting of hardware that is attached to the computer, system options that have been selected, a configuration of memory of the computer, and application programs to be present when an operating system of the computer is started. s')

-28 - 34. The method as recited in any one of claims 16 to 33, wherein the registry includes a location on the at least one computer for storing information including hardware that is attached to the computer, system options that have been selected, a configuration of memory of the computer, and application programs to be present when an operating system of the computer is started.

35. The method as recited in any one of claims 16 to 34, wherein the method is utilized to counter telTorism.

36. A computer program product embodied on a computer readable medium, comprising: computer code for identifying a change in a registry of at least one computer; and computer code for conditionally performing a scan based on whether the change in the registry is identified.

37. A system, comprising: means for identifying a change in a registry of at least one computer; and means for conditionally performing a scan based on whether the change in the registry is identified.

38. A method, comprising: determining whether a scan is scheduled; if it determined that the scan is scheduled: identi'ing a plurality of lile names in a registry of at least one computer, removing duplicate file names in the registry of at least one said computer, and scanning files associated with the file names for spyware and malware; identifying a change in the registry of at least one said computer; and if the change in the registry is identified: -29 -identifying the file names in the registry of at least one said computer, removing the duplicate file names in the registry of at least one said computer, scanning the files associated with the file names for spyware and malware, scanning the registry for predetermined keys, and removing the predetermined keys.