SigmaHQ/rules/windows/process_creation/win_xsl_script_processing.yml

title: XSL Script Processing
id: 05c36dd6-79d6-4a9a-97da-3db20298ab2d
status: experimental
description: Extensible Stylesheet Language (XSL) files are commonly used to describe the processing and rendering of data within XML files, rule detects when adversaries
    abuse this functionality to execute arbitrary files while potentially bypassing application whitelisting defenses
author: Timur Zinniatullin, oscd.community
date: 2019/10/21
modified: 2019/11/04
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1220/T1220.yaml
logsource:
    category: process_creation
    product: windows
detection:
    selection:
      - Image|endswith: '\wmic.exe'
        CommandLine|contains: '/format' # wmic process list /FORMAT /?
      - Image|endswith: '\msxsl.exe'
    condition: selection
falsepositives:
    - WMIC.exe FP depend on scripts and administrative methods used in the monitored environment
    - msxsl.exe is not installed by default so unlikely.
level: medium
tags:
    - attack.defense_evasion
    - attack.t1220
    - attack.execution # an old one
Unified line terminators of rules to Unix 2019-11-12 22:05:36 +00:00			`title: XSL Script Processing`
Added UUIDs to rules 2019-11-12 22:12:27 +00:00			`id: 05c36dd6-79d6-4a9a-97da-3db20298ab2d`
Unified line terminators of rules to Unix 2019-11-12 22:05:36 +00:00			`status: experimental`
Added UUIDs to rules 2019-11-12 22:12:27 +00:00			`description: Extensible Stylesheet Language (XSL) files are commonly used to describe the processing and rendering of data within XML files, rule detects when adversaries`
			`abuse this functionality to execute arbitrary files while potentially bypassing application whitelisting defenses`
Unified line terminators of rules to Unix 2019-11-12 22:05:36 +00:00			`author: Timur Zinniatullin, oscd.community`
			`date: 2019/10/21`
			`modified: 2019/11/04`
			`references:`
			`- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1220/T1220.yaml`
			`logsource:`
			`category: process_creation`
			`product: windows`
			`detection:`
			`selection:`
			`- Image\|endswith: '\wmic.exe'`
			`CommandLine\|contains: '/format' # wmic process list /FORMAT /?`
			`- Image\|endswith: '\msxsl.exe'`
			`condition: selection`
			`falsepositives:`
			`- WMIC.exe FP depend on scripts and administrative methods used in the monitored environment`
			`- msxsl.exe is not installed by default so unlikely.`
			`level: medium`
			`tags:`
att&ck tags review: windows/process_creation part 9 2020-08-29 16:22:09 +00:00			`- attack.defense_evasion`
Unified line terminators of rules to Unix 2019-11-12 22:05:36 +00:00			`- attack.t1220`
att&ck tags review: windows/process_creation part 9 2020-08-29 16:22:09 +00:00			`- attack.execution # an old one`