1200KM / sigma-rule
PowerShell ShellCode — Sigma Rule
Sigma rule 16b37b70-6fcf-4814-a092-c36bd3aafcbd. PowerShell ShellCode — Sigma Rule. Detects Base64 encoded Shellcode
Rule metadata and linked tags
Author: David Ledbetter (shellcode), Florian Roth (Nextron Systems). Source status: test; severity: high. Source dates: 2018-11-17 / 2024-01-25.
{
"product": "windows",
"category": "ps_script",
"definition": "Requirements: Script Block Logging must be enabled"
}Pinned original Sigma rule · Detection Rule License 1.1
Source SHA-256: bc5ecdf7fdfc0cf1c6e207a9b014d5d098a3cbac61c2ab0b7705180e27eae5a7
Detection logic
Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.
title: PowerShell ShellCode
id: 16b37b70-6fcf-4814-a092-c36bd3aafcbd
status: test
description: Detects Base64 encoded Shellcode
references:
- https://twitter.com/cyb3rops/status/1063072865992523776
author: David Ledbetter (shellcode), Florian Roth (Nextron Systems)
date: 2018-11-17
modified: 2024-01-25
tags:
- attack.privilege-escalation
- attack.stealth
- attack.t1055
- attack.execution
- attack.t1059.001
logsource:
product: windows
category: ps_script
definition: 'Requirements: Script Block Logging must be enabled'
detection:
selection:
ScriptBlockText|contains:
- 'OiCAAAAYInlM'
- 'OiJAAAAYInlM'
condition: selection
falsepositives:
- Unknown
level: high
False positives
- Unknown
Source references
Connected ecosystem references
Exact source-tagged techniques
Telemetry review
Read the original logsource above, then inspect the linked detection workspaces for technique-level sensor context. No per-rule telemetry equivalence is inferred.
Pinned research references. No browser attack runner, live simulation result or validated detector is asserted. Source mappings and validation limits are preserved. ATT&CK / Atomic provenance · Detection provenance.