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Detection rules › Sigma

Malicious ShellIntel PowerShell Commandlets

Status
test
Severity
high
Log source
category ps_script, product windows
Author
Max Altgelt (Nextron Systems), Tobias Michalski (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects Commandlet names from ShellIntel exploitation scripts.

MITRE ATT&CK coverage

TacticTechniques
Execution

Telemetry coverage

ProviderRecord / event type
PowerShellEvent ID 4104: Creating Scriptblock text (MessageNumber of MessageTotal).

Rule body

title: Malicious ShellIntel PowerShell Commandlets
id: 402e1e1d-ad59-47b6-bf80-1ee44985b3a7
status: test
description: Detects Commandlet names from ShellIntel exploitation scripts.
references:
    - https://github.com/Shellntel/scripts/
author: Max Altgelt (Nextron Systems), Tobias Michalski (Nextron Systems)
date: 2021-08-09
modified: 2023-01-02
tags:
    - attack.execution
    - attack.t1059.001
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains:
            - 'Invoke-SMBAutoBrute'
            - 'Invoke-GPOLinks'
            # - 'Out-Minidump' # Covered in 89819aa4-bbd6-46bc-88ec-c7f7fe30efa6
            - 'Invoke-Potato'
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    ScriptBlockText|contains:
        - 'Invoke-SMBAutoBrute'
        - 'Invoke-GPOLinks'
        - 'Invoke-Potato'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
ScriptBlockTextmatch
  • Invoke-GPOLinks
  • Invoke-Potato
  • Invoke-SMBAutoBrute
field:"ScriptBlockText" kind:match