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MediumSigmaHQNorbert Jaśniewicz (AlphaSOC)

PowerShell Dynamic Module Invocation Via ExportedCommands Array Index - PS Script

Detects obfuscated PowerShell scripts that enumerate Microsoft.PowerShell.Utility exported commands and invoke cmdlets indirectly by array index. This can be used to evade detections that look for explicit strings…

Description

Detects obfuscated PowerShell scripts that enumerate Microsoft.PowerShell.Utility exported commands and invoke cmdlets indirectly by array index. This can be used to evade detections that look for explicit strings such as Invoke-RestMethod or Invoke-Expression.

Detection logic

Detection requirements

Platform
ESXiLinuxmacOSNetwork DevicesWindows

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

Log source product
windows
Log source category
ps_script

Known benign triggers

  • Legitimate use of exported commands array indexing in PowerShell scripts (should be rare)

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