Detection of undesired computer files in archives
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Jul 29, 2014
Grant Date -
Apr 25, 2013
app pub date -
Nov 30, 2012
filing date -
Dec 12, 2006
priority date (Note) -
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Abstract
Systems and methods for content filtering are provided. According to one embodiment, a type and structure of an archive file are determined. The archive file includes identification bytes that identify the type of archive file and header information both in unencrypted and uncompressed form and a file data portion containing contents of files in encrypted form, compressed form or both. The determination is based solely on the identification bytes and/or the header information. Based thereon, descriptive information, describing characteristics of the files, is extracted from the header information for each file. The descriptive information includes a checksum of the file in uncompressed form, a size of the file in uncompressed form and/or a size of the file in compressed form. A file is identified as being potentially malicious or undesired when a comparison of the descriptive information to detection signatures of known malicious or undesired files results in a match.
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