Potential CommandLine Path Traversal Via Cmd.EXE — Sigma Rule

Rule metadata and linked tags

Author: xknow @xknow_infosec, Tim Shelton. Source status: test; severity: high. Source dates: 2020-06-11 / 2023-03-06.

{
  "category": "process_creation",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 669fcb6d30e0b4262649ccb9225c6e5efd822472f5470894cbec33d30a07c591

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: Potential CommandLine Path Traversal Via Cmd.EXE
id: 087790e3-3287-436c-bccf-cbd0184a7db1
status: test
description: Detects potential path traversal attempt via cmd.exe. Could indicate possible command/argument confusion/hijacking
references:
    - https://hackingiscool.pl/cmdhijack-command-argument-confusion-with-path-traversal-in-cmd-exe/
    - https://twitter.com/Oddvarmoe/status/1270633613449723905
author: xknow @xknow_infosec, Tim Shelton
date: 2020-06-11
modified: 2023-03-06
tags:
    - attack.execution
    - attack.t1059.003
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - ParentImage|endswith: '\cmd.exe'
        - Image|endswith: '\cmd.exe'
        - OriginalFileName: 'cmd.exe'
    selection_flags:
        - ParentCommandLine|contains:
              - '/c'
              - '/k'
              - '/r'
        - CommandLine|contains:
              - '/c'
              - '/k'
              - '/r'
    selection_path_traversal:
        - ParentCommandLine: '/../../'
        - CommandLine|contains: '/../../'
    filter_java:
        CommandLine|contains: '\Tasktop\keycloak\bin\/../../jre\bin\java'
    condition: all of selection_* and not 1 of filter_*
falsepositives:
    - Java tools are known to produce false-positive when loading libraries
level: high

Original YAML and metadata in JSON

False positives

• Java tools are known to produce false-positive when loading libraries

Source references

• https://hackingiscool.pl/cmdhijack-command-argument-confusion-with-path-traversal-in-cmd-exe/
• https://twitter.com/Oddvarmoe/status/1270633613449723905