US20050108340A1 - Method and apparatus for filtering email spam based on similarity measures - Google Patents

Method and apparatus for filtering email spam based on similarity measures Download PDF

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Publication number
US20050108340A1
US20050108340A1 US10/846,723 US84672304A US2005108340A1 US 20050108340 A1 US20050108340 A1 US 20050108340A1 US 84672304 A US84672304 A US 84672304A US 2005108340 A1 US2005108340 A1 US 2005108340A1
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Prior art keywords
spam
message
data
data characterizing
email message
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US10/846,723
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English (en)
Inventor
Matt Gleeson
David Hoogstrate
Sandy Jensen
Eli Mantel
Art Medlar
Ken Schneider
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Gen Digital Inc
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Individual
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Assigned to SYMANTEC CORPORATION reassignment SYMANTEC CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). Assignors: BRIGHTMAIL, INC.
Publication of US20050108340A1 publication Critical patent/US20050108340A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L51/00—User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail
    • H04L51/21—Monitoring or handling of messages
    • H04L51/212—Monitoring or handling of messages using filtering or selective blocking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L51/00—User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail
    • H04L51/06—Message adaptation to terminal or network requirements
    • H04L51/063—Content adaptation, e.g. replacement of unsuitable content

Definitions

  • the present invention relates to filtering electronic mail (email); more particularly, the present invention relates to filtering email spam based on similarity measures.
  • the Internet is growing in popularity, and more and more people are conducting business over the Internet, advertising their products and services by generating and sending electronic mass mailings.
  • These electronic messages are usually unsolicited and regarded as nuisances by the recipients because they occupy much of the storage space needed for the necessary and important data processing.
  • a mail server may have to reject accepting an important and/or desired email when its storage capacity is filled to the maximum with the unwanted emails containing advertisements.
  • thin client systems such as set top boxes, PDA's, network computers, and pagers all have limited storage capacity. Unwanted emails in any one of such systems can tie up a finite resource for the user.
  • a typical user wastes time by downloading voluminous but useless advertisement information. These unwanted emails are commonly referred to as spam.
  • a spam block method exists which keeps an index list of all spam agents (i.e., companies that generate mass unsolicited e-mails), and provides means to block any e-mail sent from a company on the list.
  • Another “junk mail” filter currently available employs filters which are based on predefined words and patterns as mentioned above. An incoming mail is designated as an unwanted mail, if the subject contains a known spam pattern.
  • the method includes receiving an incoming email message, generating data characterizing the incoming email message based on the content of the incoming email message, and comparing the generated data with a set of data characterizing spam messages. The method further includes determining whether a resemblance between the data characterizing the incoming email message and any data item from the set of data characterizing spam messages exceeds a threshold.
  • FIG. 1 is a block diagram of one embodiment of a system for controlling delivery of spam electronic mail.
  • FIG. 2 is a block diagram of one embodiment of a spam content preparation module.
  • FIG. 3 is a block diagram of one embodiment of a similarity determination module.
  • FIG. 4 is a flow diagram of one embodiment of a process for handling a spam message.
  • FIG. 5 is a flow diagram of one embodiment of a process for filtering email spam based on similarities measures.
  • FIG. 6A is a flow diagram of one embodiment of a process for creating a signature of an email message.
  • FIG. 6B is a flow diagram of one embodiment of a process for detecting spam using a signature of an email message.
  • FIG. 7 is a flow diagram of one embodiment of a process for a character-based comparison of documents.
  • FIG. 8 is a flow diagram of one embodiment of a process for determining whether two documents are similar.
  • FIG. 9 is a flow diagram of one embodiment of a process for reducing noise in an email message.
  • FIG. 10 is a flow diagram of one embodiment of a process for modifying an email message to reduce noise.
  • FIG. 11 is a block diagram of an exemplary computer system.
  • the present invention also relates to apparatus for performing the operations herein.
  • This apparatus may be specially constructed for the required purposes, or it may comprise a general purpose computer selectively activated or reconfigured by a computer program stored in the computer.
  • a computer program may be stored in a computer readable storage medium, such as, but is not limited to, any type of disk including floppy disks, optical disks, CD-ROMs, and magnetic-optical disks, read-only memories (ROMs), random access memories (RAMs), EPROMs, EEPROMs, magnetic or optical cards, or any type of media suitable for storing electronic instructions, and each coupled to a computer system bus.
  • a machine-readable medium includes any mechanism for storing or transmitting information in a form readable by a machine (e.g., a computer).
  • a machine-readable medium includes read only memory (“ROM”); random access memory (“RAM”); magnetic disk storage media; optical storage media; flash memory devices; electrical, optical, acoustical or other form of propagated signals (e.g., carrier waves, infrared signals, digital signals, etc.); etc.
  • FIG. 1 is a block diagram of one embodiment of a system for controlling delivery of spam electronic mail (email).
  • the system includes a control center 102 coupled to a communications network 100 such as a public network (e.g., the Internet, a wireless network, etc.) or a private network (e.g., LAN, Intranet, etc.).
  • the control center 102 communicates with multiple network servers 104 via the network 100 .
  • Each server 104 communicates with user terminals 106 using a private or public network.
  • the control center 102 is an anti-spam facility that is responsible for analyzing messages identified as spam, developing filtering rules for detecting spam, and distributing the filtering rules to the servers 104 .
  • a message may be identified as spam because it was sent by a known spam source (as determined, for example, using a “spam probe”, i.e., an email address specifically selected to make its way into as many spammer mailing lists as possible).
  • a server 104 may be a mail server that receives and stores messages addressed to users of corresponding user terminals sent. Alternatively, a server 104 may be a different server coupled to the mail server 104 . Servers 104 are responsible for filtering incoming messages based on the filtering rules received from the control center 102 .
  • control center 102 includes a spam content preparation module 108 that is responsible for generating data characterizing the content associated with a spam attack and sending this data to the servers 104 .
  • Each server 104 includes a similarity determination module 110 that is responsible for storing spam data received from the control center 102 and identifying incoming email messages resembling the spam content using the stored data.
  • each server 104 hosts both the spam content preparation module 108 that generates data characterizing the content associated with a spam attack and the similarity determination module 110 that uses the generated data to identify email messages resembling the spam content.
  • FIG. 2 is a block diagram of one embodiment of a spam content preparation module 200 .
  • the spam content preparation module 200 includes a spam content parser 202 , a spam data generator 206 , and a spam data transmitter 208 .
  • the spam content parser 202 is responsible for parsing the body of email messages resulting from spam attacks (referred to as spam messages).
  • the spam data generator 206 is responsible for generating data characterizing a spam message.
  • data characterizing a spam message includes a list of hash values calculated for sets of tokens (e.g., characters, words, lines, etc.) composing the spam message.
  • Data characterizing a spam message or any other email message is referred to herein as a message signature.
  • Signatures of spam messages or any other email messages may contain various data identifying the message content and may be created using various algorithms that enable the use of similarity measures in comparing signatures of different email messages.
  • the spam content preparation module 200 also includes a noise reduction algorithm 204 that is responsible for detecting data indicative of noise and removing the noise from spam messages prior to generating signatures of spam messages. Noise represents data invisible to a recipient that was added to a spam message to hide its spam nature.
  • the spam content preparation module 200 also includes a message grouping algorithm (not shown) that is responsible for grouping messages originated from a single spam attack. Grouping may be performed based on specified characteristics of spam messages (e.g., included URLs, message parts, etc.). If grouping is used, the spam data generator 206 may generate a signature for a group of spam messages rather than for each individual message.
  • a message grouping algorithm (not shown) that is responsible for grouping messages originated from a single spam attack. Grouping may be performed based on specified characteristics of spam messages (e.g., included URLs, message parts, etc.). If grouping is used, the spam data generator 206 may generate a signature for a group of spam messages rather than for each individual message.
  • the spam data transmitter 208 is responsible for distributing signatures of spam messages to participating servers such as servers 104 of FIG. 1 .
  • each server 104 periodically (e.g., each 5 minutes) initiates a connection (e.g., a secure HTTPS connection) with the call center 102 .
  • a connection e.g., a secure HTTPS connection
  • signatures are transmitted from the call center 102 to the relevant server 106 .
  • FIG. 3 is a block diagram of one embodiment of a similarity determination module 300 .
  • the similarity determination module 300 includes an incoming message parser 302 , a spam data receiver 306 , a message data generator 310 , a resemblance identifier 312 , and a spam database 304 .
  • the incoming message parser 302 is responsible for parsing the body of incoming email messages.
  • the spam data receiver 306 is responsible for receiving signatures of spam messages and storing them in the spam database 304 .
  • the message data generator 310 is responsible for generating signatures of incoming email messages.
  • a signature of an incoming email message includes a list of hash values calculated for sets of tokens (e.g., characters, words, lines, etc.) composing the incoming email message.
  • a signature of an incoming email message includes various other data characterizing the content of the email message (e.g., a subset of token sets composing the incoming email message).
  • signatures of email messages may be created using various algorithms that allow for use of similarity measures in comparing signatures of different email messages.
  • the similarity determination module 300 also includes an incoming message cleaning algorithm 308 that is responsible for detecting data indicative of noise and removing the noise from the incoming email messages prior to generating their signatures, as will be discussed in more detail below.
  • the resemblance identifier 312 is responsible for comparing the signature of each incoming email message with the signatures of spam messages stored in the spam database 304 and determining, based on this comparison, whether an incoming email message is similar to any spam message.
  • the spam database 304 stores signatures generated for spam messages before they undergo the noise reduction process (i.e., noisy spam messages) and signatures generated for these spam messages after they undergo the noise reduction process (i.e., spam message with reduced noise).
  • the message data generator 310 first generates a signature of an incoming email message prior to noise reduction, and the resemblance identifier 312 compares this signature with the signatures of noisy spam messages. If this comparison indicates that the incoming email message is similar to one of these spam messages, then the resemblance identifier 312 marks this incoming email message as spam. Alternatively, the resemblance identifier 312 invokes the incoming message cleaning algorithm 308 to remove noise from the incoming email message. Then, the message data generator 310 generates a signature for the modified incoming message, which is then compared by the resemblance identifier 312 with the signatures of spam messages with reduced noise.
  • FIG. 4 is a flow diagram of one embodiment of a process 400 for handling a spam message.
  • the process may be performed by processing logic that may comprise hardware (e.g., dedicated logic, programmable logic, microcode, etc.), software (such as run on a general purpose computer system or a dedicated machine), or a combination of both.
  • processing logic resides at a control center 102 of FIG. 1 .
  • process 400 begins with processing logic receiving a spam message (processing block 402 ).
  • processing logic modifies the spam message to reduce noise.
  • One embodiment of a noise reduction algorithm will be discussed in more detail below in conjunction with FIGS. 9 and 10 .
  • processing logic generates a signature of the spam message.
  • a signature of the spam message includes a list of hash values calculated for sets of tokens (e.g., characters, words, lines, etc.) composing the incoming email message, as will be discussed in more detail below in conjunction with FIG. 6A .
  • a signature of an incoming email message includes various other data characterizing the content of the email message.
  • processing logic transfers the signature of the spam message to a server (e.g., a server 104 of FIG. 1 ), which uses the signature of the spam message to find incoming email messages resembling the spam message (block 410 ).
  • a server e.g., a server 104 of FIG. 1
  • FIG. 5 is a flow diagram of one embodiment of a process 500 for filtering email spam based on similarities measures.
  • the process may be performed by processing logic that may comprise hardware (e.g., dedicated logic, programmable logic, microcode, etc.), software (such as run on a general purpose computer system or a dedicated machine), or a combination of both.
  • processing logic resides at a server 104 of FIG. 1 .
  • process 500 begins with processing logic receiving an incoming email message (processing block 502 ).
  • processing logic modifies the incoming message to reduce noise.
  • noise reduction algorithm One embodiment of a noise reduction algorithm will be discussed in more detail below in conjunction with FIGS. 9 and 10 .
  • processing logic generates a signature of the incoming message based on the content of the incoming message.
  • a signature of an incoming email message includes a list of hash values calculated for sets of tokens (e.g., characters, words, lines, etc.) composing the incoming email message, as will be discussed in more detail below in conjunction with FIG. 6A .
  • a signature of an incoming email message includes various other data characterizing the content of the email message.
  • processing compares the signature of the incoming messages with signatures of spam messages.
  • processing logic determines that the resemblance between the signature of the incoming message and a signature of some spam message exceeds a threshold similarity measure.
  • a threshold similarity measure One embodiment of a process for determining the resemblance between two messages is discussed in more detail below in conjunction with FIG. 6B .
  • processing logic marks the incoming email message as spam.
  • FIG. 6A is a flow diagram of one embodiment of a process 600 for creating a signature of an email message.
  • the process may be performed by processing logic that may comprise hardware (e.g., dedicated logic, programmable logic, microcode, etc.), software (such as run on a general purpose computer system or a dedicated machine), or a combination of both.
  • processing logic resides at a server 104 of FIG. 1 .
  • process 600 begins with processing logic dividing an email message into sets of tokens (processing block 602 ).
  • Each set of tokens may include a predefined number of sequential units from the email message. The predefined number may be equal to, or greater than, 1.
  • a unit may represent a character, a word or a line in the email message.
  • each set of tokens is combined with the number of occurrences of this set of tokens in the email message.
  • processing logic calculates hash values for the sets of tokens.
  • a hash value is calculated by applying a hash function to each combination of a set of tokens and a corresponding token occurrence number.
  • processing logic creates a signature for the email message using the calculated hash values.
  • the signature is created by selecting a subset of calculated hash values and adding a parameter characterizing the email message to the selected subset of calculated hash values.
  • the parameter may specify, for example, the size of the email message, the number of calculated hash values, the keyword associated with the email message, the name of an attachment file, etc.
  • a signature for an email message is created using a character-based document comparison mechanism that will be discussed in more detail below in conjunction with FIGS. 7 and 8 .
  • FIG. 6B is a flow diagram of one embodiment of a process 650 for detecting spam using a signature of an email message.
  • the process may be performed by processing logic that may comprise hardware (e.g., dedicated logic, programmable logic, microcode, etc.), software (such as run on a general purpose computer system or a dedicated machine), or a combination of both.
  • processing logic resides at a server 104 of FIG. 1 .
  • process 650 compares data in a signature of an incoming email message with data in a signature of each spam message.
  • the signature data includes a parameter characterizing the content of an email message and a subset of hash values generated for the tokens contained in the email message.
  • the parameter may specify, for example, the size of the email message, the number of tokens in the email message, the keyword associated with the email message, the name of an attachment file, etc.
  • Processing logic begins with comparing a parameter in a signature of the incoming email message with a corresponding parameter in a signature of each spam message (processing block 652 ).
  • a decision box 654 processing logic determines whether any spam message signatures contain a parameter similar to the parameter of the incoming message signature.
  • the similarity may be determined, for example, based on the allowed difference between the two parameters or the allowed ratio of the two parameters.
  • processing logic decides that the incoming email message is legitimate (i.e., it is not spam) (processing block 662 ).
  • processing logic determines whether the signature of he first spam message has hash values similar to the hash values in the signature of the incoming email (decision box 656 ). Based on the similarity threshold, the hash values may be considered similar if, for example, a certain number of them matches or the ratio of matched and unmatched hash values exceeds a specified threshold.
  • processing logic decides that the incoming email message is spam (processing block 670 ). Otherwise, processing logic further determines if there are more spam message signatures with the similar parameter (decision box 658 ). If so, processing logic determines whether the next spam message signature has hash values similar to the hash values of the incoming email signature (decision box 656 ). If so, processing logic decides that the incoming email message is spam (processing block 670 ). If not, processing logic returns to processing block 658 .
  • processing logic determines that no other spam message signatures have the similar parameter, then it decides that the incoming mail message is not spam (processing block 662 ).
  • FIG. 7 is a flow diagram of one embodiment of a process 700 for a character-based comparison of documents.
  • the process may be performed by processing logic that may comprise hardware (e.g., dedicated logic, programmable logic, microcode, etc.), software (such as run on a general purpose computer system or a dedicated machine), or a combination of both.
  • processing logic may comprise hardware (e.g., dedicated logic, programmable logic, microcode, etc.), software (such as run on a general purpose computer system or a dedicated machine), or a combination of both.
  • process 700 begins with processing logic pre-processing a document (processing block 702 ).
  • the document is pre-processed by changing each upper case alphabetic character within the document to a lower case alphabetic character. For example, the message “I am Sam, Sam I am.” may be pre-processed into an expression “i.am.sam.sam.i.am”.
  • processing logic divides the document into tokens, with each token including a predefined number of sequential characters from the document.
  • each token is combined with its occurrence number. This combination is referred to as a labeled shingle. For example, if the predefined number of sequential characters in the token is equal to 3, the expression specified above includes the following set of labeled shingles:
  • the shingles are represented as a histogram.
  • processing logic calculates hash values for the tokens.
  • the hash values are calculated for the labeled shingles. For example, if a hashing function H(x) is applied to each labeled shingle illustrated above, the following results are produced:
  • processing logic then sorts the hash values as follows:
  • processing logic selects a subset of hash values from the calculated hash values.
  • processing logic creates a signature of the document by adding to the sketch a parameter pertaining to the tokens of the document.
  • the parameter specifies the number of original tokens in the document. In the example above, the number of original tokens is 15.
  • the signature of the document can be expressed as follows:
  • FIG. 8 is a flow diagram of one embodiment of a process 800 for determining whether two documents are similar.
  • the process may be performed by processing logic that may comprise hardware (e.g., dedicated logic, programmable logic, microcode, etc.), software (such as run on a general purpose computer system or a dedicated machine), or a combination of both.
  • processing logic may comprise hardware (e.g., dedicated logic, programmable logic, microcode, etc.), software (such as run on a general purpose computer system or a dedicated machine), or a combination of both.
  • process 800 begins with processing logic comparing the token numbers specified in the signatures of documents 1 and 2, and determining whether the token number in the first signature is within the allowed range with respect to the token number from the second signature (decision box 802 ).
  • the allowed range may be a difference of 1 or less or a ratio of 90 percent or higher.
  • processing logic decides that documents 1 and 2 are different (processing block 808 ). Otherwise, if the token number in the first signature is within the allowed range with respect to the token number from the second signature, processing logic determines whether the resemblance between hash values in signatures 1 and 2 exceeds a threshold (e.g., more than 95 percent of hash values are the same) (decision box 804 ). If so, processing logic decides that the two documents are similar (processing block 806 ). If not, processing logic decides that documents 1 and 2 are different (processing block 808 ).
  • a threshold e.g., more than 95 percent of hash values are the same
  • FIG. 9 is a flow diagram of one embodiment of a process 900 for reducing noise in an email message.
  • the process may be performed by processing logic that may comprise hardware (e.g., dedicated logic, programmable logic, microcode, etc.), software (such as run on a general purpose computer system or a dedicated machine), or a combination of both.
  • processing logic may comprise hardware (e.g., dedicated logic, programmable logic, microcode, etc.), software (such as run on a general purpose computer system or a dedicated machine), or a combination of both.
  • process 900 begins with processing logic detecting in an email message data indicative of noise (processing block 902 ).
  • noise represents data that is invisible to a recipient of the mail message and was added to the email message to avoid spam filtering.
  • data may include, for example, formatting data (e.g., HTML tags), numeric character references, character entity references, URL data of predefined categories, etc.
  • Numeric character references specify the code position of a character in the document character set.
  • Character entity references use symbolic names so that authors need not remember code positions. For example, the character entity reference &aring refers to the lowercase “a” character topped with a ring.
  • processing logic modifies the content of the email message to reduce the noise.
  • the content modification includes removing formatting data, translating numeric character references and charcater entity references to their ASCII equivalents, and modifying URL data.
  • processing logic compares the modified content of the email message with the content of a spam message. In one embodiment, the comparison is performed to identify an exact match. Alternatively, the comparison is performed to determine whether the two documents are similar.
  • FIG. 10 is a flow diagram of one embodiment of a process 1000 for modifying an email message to reduce noise.
  • the process may be performed by processing logic that may comprise hardware (e.g., dedicated logic, programmable logic, microcode, etc.), software (such as run on a general purpose computer system or a dedicated machine), or a combination of both.
  • processing logic may comprise hardware (e.g., dedicated logic, programmable logic, microcode, etc.), software (such as run on a general purpose computer system or a dedicated machine), or a combination of both.
  • process 1000 begins with processing logic searching an email message for formatting data (e.g., HTML tags) (processing block 1002 ).
  • formatting data e.g., HTML tags
  • processing logic determines whether the found formatting data qualifies as an exception.
  • HTML formatting does not add anything to the information content of a message.
  • exceptions are the tags that contain useful information for further processing of the message (e.g., tags ⁇ BODY>, ⁇ A>, ⁇ IMG>, and ⁇ FONT>).
  • tags ⁇ BODY>, ⁇ A>, ⁇ IMG>, and ⁇ FONT> are needed for “white on white” text elimination, and the ⁇ A> and ⁇ IMG> tags typically contain link information that may be used for passing data to other components of the system.
  • the formatting data is extracted from the email message (processing block 1006 ).
  • processing logic converts each numerical character reference and character entity reference into a corresponding ASCII character (processing block 1008 ).
  • numeric character references may take two forms:
  • the string “&” corresponds to the string “&” in ASCII
  • the string “#” corresponds to the string “#” in ASCII
  • the string “3” corresponds to 3 in ASCII
  • the string “#56;” corresponds to 8 in ASCII
  • “#59;” corresponds to the string “; ” in ASCII.
  • processing logic checks whether the converted data still includes numeric character references or character entity references (decision box 1010 ). If the check is positive, processing logic repeats the conversion operation at processing block 1008 . Otherwise, processing logic proceeds to processing block 1012 .
  • processing logic modifies URL data of predefined categories. These categories may include, for example, numerical character references contained in the URL that are converted by processing logic into corresponding ASCII characters.
  • URL “password” syntax may be used to add characters before an “@” in the URL hostname. These characters are ignored by the target web server but they add significant amounts of noise information to each URL.
  • Processing logic modifies the URL data by removing these additional characters. Finally, processing logic removes the “query” part of the URL, following a string “?” at the end of the URL.
  • FIG. 11 is a block diagram of an exemplary computer system 1100 that may be used to perform one or more of the operations described herein.
  • the machine may comprise a network router, a network switch, a network bridge, Personal Digital Assistant (PDA), a cellular telephone, a web appliance or any machine capable of executing a sequence of instructions that specify actions to be taken by that machine.
  • PDA Personal Digital Assistant
  • the computer system 1100 includes a processor 1102 , a main memory 1104 and a static memory 1106 , which communicate with each other via a bus 1108 .
  • the computer system 1100 may further include a video display unit 1110 (e.g., a liquid crystal display (LCD) or a cathode ray tube (CRT)).
  • the computer system 1100 also includes an alpha-numeric input device 1112 (e.g., a keyboard), a cursor control device 1114 (e.g., a mouse), a disk drive unit 1116 , a signal generation device 1120 (e.g., a speaker) and a network interface device 1122 .
  • the disk drive unit 1116 includes a computer-readable medium 1124 on which is stored a set of instructions (i.e., software) 1126 embodying any one, or all, of the methodologies described above.
  • the software 1126 is also shown to reside, completely or at least partially, within the main memory 1104 and/or within the processor 1102 .
  • the software 1126 may further be transmitted or received via the network interface device 1122 .
  • the term “computer-readable medium” shall be taken to include any medium that is capable of storing or encoding a sequence of instructions for execution by the computer and that cause the computer to perform any one of the methodologies of the present invention.
  • the term “computer-readable medium” shall accordingly be taken to included, but not be limited to, solid-state memories, optical and magnetic disks, and carrier wave signals.

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