KR20120039569A - Apparatus for preventing malicious codes using executive files - Google Patents

Abstract

PURPOSE: A device for preventing malicious codes using executive files is provided to prevent generation of executive files including malicious codes or changes of executive files due to the malicious codes, thereby protecting a system from the malicious codes without a separate update process. CONSTITUTION: A database(114) stores an original information value. The original information value includes a value to which a hash function is applied to executive files stored in an agent system. A blocking module(102) sets a blocking mode for moving, deleting, generating, or changing the executive files. The blocking module backs an original executive file up when the executive file is changed in the blocking mode. A file executing module(104) compares an information value including a value to which a hash function is applied with an original information value of the database to determine execution of a specific execution file.

Description

Anti-malware device using executable file {APPARATUS FOR PREVENTING MALICIOUS CODES USING EXECUTIVE FILES}

The present invention relates to blocking malicious code, and more particularly, to block executable files in an agent system from being moved, deleted, changed, or created so that executable files including malicious code are generated in the agent system or executable files are generated by malicious code. The present invention relates to a malicious code blocking device and method using an executable file that can be prevented from being changed.

In general, in order to prevent malware infection on a dedicated agent system, such as a dedicated personal computer device, an antivirus product for a client having an antivirus engine is installed to prevent infection of malware. In order to prevent malware infection, existing anti-virus engines need to update their anti-virus engines regularly on their personal computers, as well as update their security.

On the other hand, the malicious code blocking method used by the administrator on a computer system with a dedicated function blocks execution of an unspecified file in parallel with the malware diagnosis program. In order to block execution of an unspecified file, the existing Secure OS On the installed system, set the rule by combining the file's path name, file name, and hash, and block the execution or reading of the file that does not meet the set rule.

However, there is a problem in that the computer system cannot perform the necessary functions because the misdiagnosis often causes the deletion of files necessary for the computer system when the malicious code is used to repair the malicious code in the computer system. However, there is a problem that files in the computer system are changed by malicious code.

In order to solve the above problems, an object of the present invention is to provide malicious code for a specific executable file when executing the specific executable file in a blocking mode that blocks movement, deletion, change, or creation of the executable file installed in the agent system. Execution or blocking is executed by comparing the DNA value of the scanned specific executable file with the original DNA value stored in the database, and the executable file containing the malicious code is generated without any complicated rules. The present invention provides an apparatus and method for preventing malicious code using an executable file that can prevent the executable files from being changed.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the object of the present invention, an apparatus for preventing malicious code using an executable file according to an embodiment of the present invention includes a database storing original DNA values for each executable file stored in an agent system, movement of the executable files, A blocking module for setting a blocking mode for blocking a change or creation, and when an executable file in the agent system is changed in the blocking mode, a blocking module for backing up the original executable file before the change, and for a specific executable file in the agent system When there is an execution request, it is determined whether to execute the specific executable file by comparing the DNA value of the specific executable file with the original DNA value of the specific executable file stored in the database, and wherein the specific executable file is the arbitrary executable file. If the original backup file is restored by running Contains file execution modules.

The malicious code blocking apparatus using the executable file according to an embodiment of the present invention, when there is a request for updating the executable file in the agent system, compares the executable files by comparing the DNA value of each executable file in the agent system with a database. It may include a block release module for determining whether to release the blocking mode by checking the presence or absence of the change.

In the apparatus for blocking malicious code using an executable file according to an embodiment of the present disclosure, the blocking module may set the blocking mode according to a request of a management server connected through a communication network.

In the malicious code blocking apparatus using an executable file according to an embodiment of the present invention, when there is a request to execute the specific executable file in the blocking mode, the malicious code blocking apparatus performs a malicious code scan on the specific executable file, and then the specific scan is completed. It may further include a malicious code inspection module for providing an executable file to the file execution module.

In the malicious code blocking device using the executable file according to an embodiment of the present invention, the malicious code inspection module may generate a notification message based on a malicious code scan result for the specific executable file.

In the malicious code blocking device using an executable file according to an embodiment of the present invention, the notification message may be generated in the form of a log, a notification window, or an e-mail.

In the malicious code blocking apparatus using the executable file according to an embodiment of the present invention, the file execution module blocks execution of the specific executable file when the DNA value of the specific executable file does not match the original DNA value stored in the database. In addition, the test may be requested by transmitting the DNA value of the specific executable file to a management server connected through a communication network.

The malicious code blocking apparatus using an executable file according to an embodiment of the present invention, the agent system in the administrator mode that can move, delete, create or change any executable file in response to the administrator of the agent system in the blocking mode. It may further include an administrator module for setting the.

An apparatus for blocking malicious code using an executable file according to an embodiment of the present invention uses DNA values of the updated executable files as executable files in the agent system are updated after the blocking mode is released by the unblocking module. It may further include an update module for updating the database.

In the malicious code blocking apparatus using an executable file according to an embodiment of the present invention, the blocking module may reset the agent system to the blocking mode when the database is updated.

In another aspect, the malicious code blocking method using an executable file according to an embodiment of the present invention, if the agent system is running, setting a blocking mode for blocking the movement, deletion, creation or change of the executable file, and the agent If there is a request for execution of a specific executable file in a system, checking whether the malicious code is infected with the specific executable file, calculating a DNA value of the specific executable file that has been scanned, the calculated DNA value, Comparing the original DNA values of the specific executable files stored in the database and blocking the specific executable files if they do not match.

In the malicious code blocking method using an executable file according to an embodiment of the present invention, determining whether there is a change request for any executable file in the blocking mode state, and if the change request is received, the arbitrary executable file is changed. Backing up the original arbitrary executable file before the change and changing the arbitrary executable file, and recovering and executing the backed up original executable file if there is a request for execution of the changed arbitrary executable file. It may further include.

Restoring the arbitrary executable file in the malicious code blocking room using the executable file according to an embodiment of the present invention, when there is an execution request for the changed arbitrary executable file, the malicious code for the changed arbitrary executable file Determining the deletion of the modified arbitrary executable file by comparing the DNA value of the modified arbitrary executable file with the DNA value stored in the database; It may include the step of restoring to run.

In the malicious code blocking method using an executable file according to an embodiment of the present invention, the checking whether the malicious code is infected includes checking whether the malicious code is infected with the changed executable file, and as a result of the checking, the modified random file is detected. When the executable file is infected with malicious code, the method may further include generating only a notification message and providing the same to an administrator of the agent system.

The present invention prevents executable files including malicious code from being created or modified by malicious codes by blocking moving, deleting, changing, or creating executable files in the agent system. The effect is to protect the system from code.

In addition, the present invention prevents moving, deleting, changing, or creating an executable file installed in an agent system, and executes the executable file through comparison between the original DNA value stored in the database and the DNA value of the executable file when executing the executable file; By blocking them, you can improve the security of your agent system with fewer resources without updating your antivirus engine or your system.

1 is a block diagram showing a malicious code blocking device and its surrounding configuration for blocking malicious code according to an embodiment of the present invention,
2 is a flowchart illustrating a process of blocking malicious code by an apparatus for blocking malicious code according to an embodiment of the present invention.

The objects and effects of the present invention and the technical configurations for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like.

The present invention can be embodied as computer-readable codes on a computer-readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable recording media include ROM, RAM, CO-ROM, magnetic tape, floppy disks, optical data storage devices, and the like, which may also be implemented in the form of carrier waves (for example, transmission over the Internet). Include. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The present embodiments are merely provided to complete the disclosure of the present invention and to fully inform the scope of the invention to those skilled in the art, and the present invention is defined by the scope of the claims. It will be. Therefore, the definition should be based on the contents throughout this specification.

In an embodiment of the present invention, blocking the movement, deletion, change, or creation of an executable file installed in an agent system, and when the specific executable file is executed in the blocking mode, the malware is infected with the specific executable file and then scanned. This article describes a malicious code blocking device and method using an executable file that executes or blocks an executable file by comparing the DNA value of a specific executable file with an original DNA value stored in a database.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a block diagram illustrating a malicious code blocking device and its surrounding configuration for blocking malicious code according to an embodiment of the present invention, the malware blocking device 100 and the agent system and the wired and wireless communication network largely installed in the agent system It consists of a management server 150 connected through.

The agent system is a low specification terminal, and examples thereof include a terminal for managing a factory system, a POS system, a production management system, and the like. The anti-malware device 100 is installed in such an agent system. The anti-malware device 100 may include a blocking module 102, a file execution module 104, an unblocking module 106, an administrator module 108, Update module 110, malware inspection module 112, and database 114.

In the database 114 according to an embodiment of the present invention, original DNA values of parts of each executable file stored in the agent system are stored. Here, the executable file may include a general EXE file, a script file having executable code, a document file having a script function, and the like, and the DNA value may be a value obtained by applying a CRC-based hash function.

The blocking module 102 is a means for setting a blocking mode for blocking movement, deletion, creation, or change of executable files in the agent system. When the agent system is initially started, the blocking module 102 moves the executable files by setting the agent system to the blocking mode. Blocks deletion, creation, or change

Meanwhile, the blocking module 102 backs up the original arbitrary executable file before the change when any executable file is changed in the blocking mode state, and deletes the changed executable file when there is an execution request for the changed executable file. By blocking the execution of the changed arbitrary executable file, and then providing the backed up original arbitrary executable file to the file execution module 104 to execute the backed up original arbitrary executable file.

The blocking module 102 may block any executable file that has not been changed by comparing the DNA value of the changed executable file with the DNA value stored in the database 114. .

The file execution module 104 executes the backed up original arbitrary executable file provided from the blocking module 102, and executes the execution by comparing the backed up original arbitrary executable file with the DNA value stored in the database 114. Decide

That is, the file execution module 104 is a means for operating when there is a request for execution of a specific executable file in the agent system, and after calculating the DNA value of the specific executable file, the calculated DNA value and the specific execution stored in the database 114. By comparing the original DNA values of the files, it checks whether a specific executable file has been changed and executes or blocks the execution of the specific file based on the test result.

In addition, the file execution module 104 is a DNA of a specific executable file to the management server 150 connected through a wired or wireless communication network if the DNA value of the specific executable file and the original DNA value of the specific executable file stored in the database 114 does not match You can send a value to request a scan for a particular executable.

The unblocking module 106 is a means that operates when an update request for an executable file in an agent system or a request from an administrator of the agent system is requested. The unblocking module 106 calculates a DNA value for each executable file in the agent system, The blocking mode is released after checking whether each of the executable files has been changed by comparing the original DNA values stored in the database 114.

That is, the unblocking module 106 checks whether the executable files in the agent system have been changed by checking whether the original DNA value stored in the database 114 and the DNA value of each of the executable files in the agent system match. It determines the release of the blocking mode set by the administrator, and according to the release of the blocking mode, the administrator can install a new program or change or delete files in the agent system.

The administrator module 108 may move, delete, create, or change a specific executable file for the treatment or deletion of malicious code files that the agent system does not recognize at the request of the administrator while the agent system operates in the blocking mode. Provides an interface for setting the administrator mode.

In other words, the manager module 108 provides an interface for setting the agent system to the manager mode in the blocked mode.

The update module 110 updates the original DNA values stored in the database 114 using the DNA values of the executable files updated as the executable files in the agent system are updated after the blocking mode is released by the unblocking module 106. Let's do it. In this manner, as the update of the database 114 is completed, the blocking module 102 sets the agent system to the blocking mode.

The malicious code checking module 112 is a means for performing a malicious code checking on files in the agent system at a predetermined cycle or a request for execution of a specific file in the agent system.

In an embodiment of the present invention, when the executable file in the agent system is changed or when there is a request for execution of a specific executable file, the malicious code scan module 112 determines whether the malicious code is infected by examining the changed executable file or the specific executable file, Based on the determination result, a predetermined notification message may be provided. In this case, the notification message may be generated by generating a log, generating a notification window, or sending an email to an administrator's email.

In general, the agent system is determined to be a normal file instead of a malicious code in the malware inspection module 112 at the time of switching to the blocking mode, but the engine update of the malware inspection module 112 afterwards results in malicious code. Malware can be identified as a malicious file with an incorrect update. In this case, the malware inspection module 112 according to an embodiment of the present invention provides the administrator with a scan result for a specific file in the form of a notification message, so that the administrator of the agent system uses the administrator module 108 in the administrator mode. By setting the agent system, you can manually move, delete, create, or change the executable files in the agent system in the blocking mode.

In the exemplary embodiment of the present invention, the blocking module 102 sets the blocking mode by itself, for example. However, the blocking module 102 may set the blocking mode by control from the management server 150 connected through the wired / wireless communication network. Here, the management server 150 may be operated by an antivirus service provider that may provide a function for updating the malware information of the agent system malware inspection module 112, and manage a plurality of agent systems. Can be. That is, the management server 150 may request a plurality of agent systems to set a blocking mode, and accordingly, the malicious code blocking apparatus 100 of the plurality of agent systems sets a blocking mode to move, delete, or create executable files. You can block changes.

According to an embodiment of the present invention, by blocking the execution files in the agent system to be moved, deleted, changed or created by using the blocking module 102, an executable file containing malicious code is added or existing by the malicious code. You can prevent the executables from changing.

A process of blocking the malicious code by operating the malicious code blocking device 100 having the above configuration will be described with reference to FIG. 2.

2 is a flowchart illustrating a process of blocking malicious code by an apparatus for blocking malicious code according to an embodiment of the present invention.

As shown in FIG. 2, the malicious code blocking apparatus 100 of the agent system calculates an original DNA value for each part of each executable file and stores the original DNA value in the database 114 (S200).

Then, the blocking module 102 sets a blocking mode for blocking execution files from being moved, deleted, created or changed (S202).

Thereafter, the file execution module 104 of the malicious code blocking apparatus 100 determines whether there is a request for executing a specific execution file (S204).

As a result of the determination of S204, when there is an execution request for a specific executable file, the malicious code scanning module 112 checks whether a malicious code is infected with the specific executable file using a preset antivirus engine, and notifies based on the scan result. Create a message and provide it to the manager of the agent system. For example, if a particular executable file is infected with malicious code, the malware inspection module 112 generates only a notification message indicating that the specific executable file is infected with malware without cleaning, ie, modifying or deleting the specific executable file. Should be provided to the administrator. The specific executable file checked by the malicious code inspection module 112 is provided to the file execution module 104.

On the other hand, the file execution module 104 calculates the DNA value of the specific executable file that has been scanned for malicious code (S206), and compares the calculated DNA value with the original DNA value of the specific executable file stored in the database 114 by comparison. It is determined whether or not (S208).

As a result of the determination of S208, when the calculated DNA value and the original DNA value match, the file execution module 104 executes a specific executable file (S212), otherwise the blocking module 102 performs a backup file for the specific executable file. It is determined whether there exists (S214).

As a result of the determination of S214, when the backup file exists, the blocking module 102 deletes a specific execution file (S216) and then provides the backup file to the file execution module 104 to execute it (S218).

On the other hand, when the determination result of S214, if the backup file does not exist, the blocking module 102 deletes the specific executable file and transmits the DNA value of the specific executable file to the management server 150 through the wired or wireless communication network to the specific executable file. It may request a test for malware infection (S220).

On the other hand, the malicious code blocking device 100 of the agent system determines from the administrator whether there is an update request for the executable file in the agent system (S222).

As a result of the determination of S222, when there is an update request, the unblocking module 106 calculates DNA values for all executable files in the agent system and then compares the calculated DNA values with original DNA values stored in the database 114. If there is a match, the blocking mode set by the blocking module 102 is released. Accordingly, the administrator can update the executable files in the agent system by installing a new program or moving, deleting or changing an existing executable file on the agent system. have. As the update of the executable files is completed, the update module 110 calculates an original DNA value using the updated executable files in the agent system and updates the database 114 based on the original DNA value (S224).

As described above, as the update is completed (S226), the blocking module 102 resets the blocking mode to protect the executable files in the agent system (S228), and the malicious code blocking device 100 of the agent system receives the malicious code from the administrator. It is determined whether there is a request for release of the blocking mode for examination and treatment (S230).

As a result of the determination in S230, when there is a request for releasing the blocking mode from the administrator, the administrator module 108 of the malicious code blocking apparatus 100 releases the blocking mode set by the blocking module 102, such that the administrator moves any executable file. , Can be deleted or changed (S232).

According to an embodiment of the present invention, it is possible to block moving, deleting, changing, or generating an executable file installed in the agent system, and comparing the original DNA value stored in the database 114 with the DNA value of the executable file when executing the executable file. By running or blocking executable files, you can improve the security of the agent system with fewer resources without updating the antivirus engine or updating the system.

The present invention has been described above with reference to specific embodiments of the present invention, but this is only illustrative and does not limit the scope of the present invention. Those skilled in the art can change or modify the described embodiments without departing from the scope of the present invention. Each of the functional blocks or means described in the present specification may be implemented in a program form, and may be implemented separately, or two or more may be integrated into one. Components such as modules described as separate in the specification and claims may be merely functionally distinct and may be physically implemented by one means, and components such as means described as a single element may be divided into several components. It can be made in combination. In addition, each method step described herein may be changed in order without departing from the scope of the present invention, and other steps may be added. In addition, the various embodiments described herein may be implemented independently as well as each other as appropriate. Therefore, the scope of the invention should be defined by the appended claims and their equivalents, rather than by the described embodiments.

100: malware blocking device 102: blocking module
104: file execution module 106: unblocking module
108: manager module 110: update module
112: database 150: management server

Claims (1)

A database in which original information values including a hash function value are stored for each executable file stored in the agent system;
Set a blocking mode for blocking movement, deletion, creation or change of the executable file, and if any executable file in the agent system is changed in the blocking mode, back up the original executable file before changing the arbitrary executable file Blocking module,
When there is an execution request for a specific executable file in the agent system, the specific executable file is compared by comparing an information value including a value of applying a hash function to the specific executable file with an original information value of the specific executable file stored in the database. Includes a file run module that determines whether to run
The executable module executes the backed up original executable file when the specific executable file is any modified executable file.
Anti-malware device using executable file.

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