Powershell Execute Batch Script — Sigma Rule

Rule metadata and linked tags

Author: frack113. Source status: test; severity: medium. Source dates: 2022-01-02 / not supplied.

{
  "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: 3522cc21256eed572273bccc912e26c4e880778c263070356606ea119ed3bc77

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 Execute Batch Script
id: b5522a23-82da-44e5-9c8b-e10ed8955f88
status: test
description: |
    Adversaries may abuse the Windows command shell for execution.
    The Windows command shell ([cmd](https://attack.mitre.org/software/S0106)) is the primary command prompt on Windows systems.
    The Windows command prompt can be used to control almost any aspect of a system, with various permission levels required for different subsets of commands.
    Batch files (ex: .bat or .cmd) also provide the shell with a list of sequential commands to run, as well as normal scripting operations such as conditionals and loops.
    Common uses of batch files include long or repetitive tasks, or the need to run the same set of commands on multiple system
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1059.003/T1059.003.md#atomic-test-1---create-and-execute-batch-script
author: frack113
date: 2022-01-02
tags:
    - attack.execution
    - attack.t1059.003
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection_start:
        ScriptBlockText|contains: Start-Process
    selection_batch:
        ScriptBlockText|contains:
            - '.cmd'
            - '.bat'
    condition: all of selection_*
falsepositives:
    - Legitimate administration script
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate administration script

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1059.003/T1059.003.md#atomic-test-1---create-and-execute-batch-script