Detection rules › Sigma
Screen Capture with Xwd
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
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Collection | T1113 Screen Capture |
Event coverage
| Provider | Event |
|---|---|
| Linux-Auditd | Event ID 1309 |
Rule body yaml
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
Stages and Predicates
Stage 0: condition
selection and 1 of xwd_*Stage 1: selection
selection:
type: EXECVE
a0: xwd
Stage 2: xwd_root_window
xwd_root_window:
a1: '-root'
a2: '-out'
a3|endswith: '.xwd'
Stage 3: xwd_no_root_window
xwd_no_root_window:
a1: '-out'
a2|endswith: '.xwd'
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.