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MediumSigmaHQStephen Lincoln @slincoln-aiq (AttackIQ)

Potentially Suspicious Desktop Background Change Using Reg.EXE

Detects the execution of "reg.exe" to alter registry keys that would replace the user's desktop background. This is a common technique used by malware to change the desktop background to a ransom note or other image.

Detection logic

Detection requirements

Platform
ESXiLinuxmacOSWindows

The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.

Log source product
windows
Log source category
process_creation

Known benign triggers

  • Administrative scripts that change the desktop background to a company logo or other image.

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