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P4T12ICK
62 lines
2.2 KiB
YAML
62 lines
2.2 KiB
YAML
name: Suspicious GPUpdate no Command Line Arguments
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id: f308490a-473a-40ef-ae64-dd7a6eba284a
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version: 3
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date: '2022-03-15'
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author: Michael Haag, Splunk
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status: production
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type: TTP
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description: The following analytic identifies gpupdate.exe with no command line arguments.
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It is unusual for gpupdate.exe to execute with no command line arguments present.
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This particular behavior is common with malicious software, including Cobalt Strike.
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During investigation, identify any network connections and parallel processes. Identify
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any suspicious module loads related to credential dumping or file writes. gpupdate.exe
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is natively found in C:\Windows\system32 and C:\Windows\syswow64.
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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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OriginalFileName: GPUpdate.exe
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selection2:
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Image|endswith: gpupdate.exe
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condition: (selection1 or selection2)
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the process name, parent process, and command-line executions from your
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endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
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Sysmon TA.
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known_false_positives: Limited false positives may be present in small environments.
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Tuning may be required based on parent process.
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references:
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- https://raw.githubusercontent.com/xx0hcd/Malleable-C2-Profiles/0ef8cf4556e26f6d4190c56ba697c2159faa5822/crimeware/trick_ryuk.profile
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- https://www.cobaltstrike.com/blog/learn-pipe-fitting-for-all-of-your-offense-projects/
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tags:
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analytic_story:
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- Cobalt Strike
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asset_type: Endpoint
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confidence: 70
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impact: 70
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message: Suspicious gpupdate.exe process with no command line arguments executed
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on $dest$ by $user$
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mitre_attack_id:
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- T1055
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observable:
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- name: dest
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type: Endpoint
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role:
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- Victim
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- name: User
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type: User
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role:
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- Victim
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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: 49
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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/T1055/cobalt_strike/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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