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Detections & Bypass

  • System wide transcription

  • Script block logging

  • AMSI

  • Constrained language mode (CLM) - Integrated with AppLocker and WDAC

Execution Policy

  • Not a security control.

  • Prevents the user from accidentally running scripts

  • To disable:

powershell -ExecutionPolicy bypass
powershell -c "command"
$env:PSExecutionPolicyPreference = "bypass"

Detections

AMSI

We can use AMSITrigger and DefenderCheck to check our powershell script and binaries for detection.

.\AMSITrigger_x64.exe -i C:\Tool\BadPowershellCode.ps1
.\DefenderCheck.exe PowerUp.ps1

Bypass

Loggining & Monitoring Bypass

Invisi-Shell

  • Github

  • Disables

    • System Wide Transciption

    • Script Block Logginig

    • ASMI

AMSI Bypass - Ofuscator

Invoke-Obfuscation

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