Screen Capture with Xwd — Sigma Rule

Rule metadata and linked tags

Author: Pawel Mazur. Source status: test; severity: low. Source dates: 2021-09-13 / 2022-12-18.

{
  "product": "linux",
  "service": "auditd"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: f31872b21db8dab99abcc2e9355f4cc6fea2d7ea4cb1c0e4ac80ae854ed00209

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: Screen Capture with Xwd
id: e2f17c5d-b02a-442b-9052-6eb89c9fec9c
status: test
description: Detects adversary creating screen capture of a full with xwd. Highly recommended using rule on servers, due high usage of screenshot utilities on user workstations
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1113/T1113.md#atomic-test-3---x-windows-capture
    - https://linux.die.net/man/1/xwd
author: 'Pawel Mazur'
date: 2021-09-13
modified: 2022-12-18
tags:
    - attack.collection
    - attack.t1113
logsource:
    product: linux
    service: auditd
detection:
    selection:
        type: EXECVE
        a0: xwd
    xwd_root_window:
        a1: '-root'
        a2: '-out'
        a3|endswith: '.xwd'
    xwd_no_root_window:
        a1: '-out'
        a2|endswith: '.xwd'
    condition: selection and 1 of xwd_*
falsepositives:
    - Legitimate use of screenshot utility
level: low

Original YAML and metadata in JSON

False positives

• Legitimate use of screenshot utility

Source references

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1113/T1113.md#atomic-test-3---x-windows-capture
• https://linux.die.net/man/1/xwd