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HighSigmaHQSwachchhanda Shrawan Poudel (Nextron Systems)

MMC Executing Files with Reversed Extensions Using RTLO Abuse

Detects malicious behavior where the MMC utility (`mmc.exe`) executes files with reversed extensions caused by Right-to-Left Override (RLO) abuse, disguising them as document formats.

Detection logic

Detection requirements

Platform
LinuxmacOSWindows

The rule states no platform. This is derived from the 3 ATT&CK techniques it maps to.

Log source product
windows
Log source category
process_creation

Known benign triggers

  • Legitimate administrative actions using MMC to execute misnamed `.msc` files.
  • Unconventional but non-malicious usage of RLO or reversed extensions.

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