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

• Github