title: PowerShell ShellCode
author: David Ledbetter (shellcode), Florian Roth (rule)
date: 2018/11/17
description: Detects Base64 encoded Shellcode
detection:
  SELECTION_1:
    ScriptBlockText: '*AAAAYInlM*'
  SELECTION_2:
    ScriptBlockText:
    - '*OiCAAAAYInlM*'
    - '*OiJAAAAYInlM*'
  condition: (SELECTION_1 and SELECTION_2)
falsepositives:
- Unknown
id: 16b37b70-6fcf-4814-a092-c36bd3aafcbd
level: critical
logsource:
  category: ps_script
  definition: Script block logging must be enabled
  product: windows
modified: 2021/10/16
references:
- https://twitter.com/cyb3rops/status/1063072865992523776
status: experimental
tags:
- attack.defense_evasion
- attack.privilege_escalation
- attack.t1055
- attack.execution
- attack.t1059.001
- attack.t1086