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HighSigmaHQMatthew Green - @mgreen27 +2

Potential Defense Evasion Via Rename Of Highly Relevant Binaries

Detects the execution of a renamed binary often used by attackers or malware leveraging new Sysmon OriginalFileName datapoint.

Detection logic

Detection requirements

Platform
LinuxmacOSWindows

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source product
windows
Log source category
process_creation

Known benign triggers

  • Custom applications use renamed binaries adding slight change to binary name. Typically this is easy to spot and add to whitelist
  • PsExec installed via Windows Store doesn't contain original filename field (False negative)

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