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P4T12ICK
53 lines
1.8 KiB
YAML
53 lines
1.8 KiB
YAML
name: Windows Indirect Command Execution Via pcalua
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id: 3428ac18-a410-4823-816c-ce697d26f7a8
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version: 1
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date: '2022-04-05'
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author: Eric McGinnis, Splunk
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status: production
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type: TTP
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description: The following analytic detects programs that have been started by pcalua.exe.
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pcalua.exe is the Microsoft Windows Program Compatability Assistant. While this
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tool can be used to start legitimate programs, it has been observed being used to
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evade protections on command line execution.
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data_source:
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- Sysmon Event ID 1
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search:
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selection1:
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ParentCommandLine: '*pcalua* -a*'
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condition: selection1
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the full process path in the process field of CIM's Process data model.
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If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA.
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Tune and filter known instances where pcalua.exe may be used.
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known_false_positives: Some legacy applications may be run using pcalua.exe. Filter
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these results as needed.
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references:
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- https://twitter.com/KyleHanslovan/status/912659279806640128
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- https://lolbas-project.github.io/lolbas/Binaries/Pcalua/
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tags:
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analytic_story:
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- Living Off The Land
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asset_type: Endpoint
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confidence: 50
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impact: 50
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message: The Program Compatability Assistant (pcalua.exe) launched the process $process_name$
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mitre_attack_id:
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- T1202
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observable:
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- name: process_name
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type: Process
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role:
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- Child Process
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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risk_score: 25
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1202/atomic_red_team/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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