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HighSigmaHQNorbert Jaśniewicz (AlphaSOC) +1

PowerShell Dynamic Module Invocation Via ExportedCommands Array Index

Detects PowerShell processes invoked with obfuscated command lines that enumerate Microsoft.PowerShell.Utility exported commands and invoke cmdlets indirectly by array index. This technique is used to evade…

Description

Detects PowerShell processes invoked with obfuscated command lines that enumerate Microsoft.PowerShell.Utility exported commands and invoke cmdlets indirectly by array index. This technique is used to evade detections that look for explicit strings such as Invoke-RestMethod or Invoke-Expression.

Detection logic

Detection requirements

Platform
LinuxmacOSWindows

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

  • Legitimate use of exported commands array indexing during PowerShell command execution (should be rare)

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