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The IM Security scan engine can extract and scan files compressed using any of the most popular compression types (listed below). IM Security can also check for viruses/malware being "smuggled" within nested compressions, for example, an infected file that is zipped, ARJ-compressed, MS-compressed, and zipped again.
The maximum number of recursive scan layers is 20. You can configure this limit from File Transfer Scan → Virus Scan → Target → Scan Restriction Criteria.

Supported Compression Types

  • Archive created by LHA (.lzh)
  • MacBinary (.bin)
  • Archive created by Pkzip (.zip)
  • Microsoft Cabinet (.cab)
  • Archive created by RAR (.rar)
  • Microsoft Compressed/MSCOMP
  • Archive created by Tar (.tar)
  • MIME (.eml; .mht)
  • ARJ Compressed archive (.arj)
  • Teledisk format (.td0)
  • BINHEX (.hqx)
  • Unix BZ2 Bzip compressed file (.bz2)
  • GNU Zip (.gz; .gzip)
  • UUEncode (.u)
  • LZW/Compressed 16bits (.Z)
  • WinAce (.ace)
Keywords: compression types