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Deception indicators

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The following indicators may indicate that the user of a computer system is trying to hide their presence, implicate another individual, convey erroneous information, or otherwise attempt to deceive a forensic analysis or tool.

Unfortunately, many of the deception indicators are also indicators of good security practice.

File System Indicators

  • Files having the wrong extension (e.g. file.jpg instead of file.doc).
  • Very large files (may indicate use of cryptographic file systems, virtual machines, etc.)
  • Virtual Machine Players (VMWare, VirtualBox, Parallels)
  • TrueCrypt or RealCrypt
  • PGP files or Volumes
  • PointSec
  • Encrypted email
  • Date or time wrong
  • Repeating data over the drive
  • Truncated history files

Log File Indicators

Log files that are:

  • Missing
  • Truncated
  • With time gaps
  • With one or more incomplete lines, or other lines that start midway (happens if the attacker removes the last 4K of a file without respect to line boundaries)
  • Inconsistencies (e.g. email that is forwarded without being received.)

Network Communications

  • Presence or use of VPN software.
  • Use of anonymity websites, such as:
    • Open Proxy Servers (got a list?)
  • Setting a proxy server
  • ssh

Redaction Indicators

  • Evidence Eliminator
  • ccleaner
  • list of Drive Cleaner tools; searches for drive cleaning software