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P4T12ICK
68 lines
2.3 KiB
YAML
68 lines
2.3 KiB
YAML
name: Malicious Powershell Executed As A Service
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id: 8e204dfd-cae0-4ea8-a61d-e972a1ff2ff8
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version: 1
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date: '2021-04-07'
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author: Ryan Becwar
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type: TTP
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datamodel:
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- Endpoint
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description: This detection is to identify the abuse the Windows SC.exe to execute
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malicious commands or payloads via PowerShell.
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search: ' `wineventlog_system` EventCode=7045 | eval l_Service_File_Name=lower(Service_File_Name)
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| regex l_Service_File_Name="powershell[.\s]|powershell_ise[.\s]|pwsh[.\s]|psexec[.\s]"
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| regex l_Service_File_Name="-nop[rofile\s]+|-w[indowstyle]*\s+hid[den]*|-noe[xit\s]+|-enc[odedcommand\s]+"
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| stats count min(_time) as firstTime max(_time) as lastTime by EventCode Service_File_Name
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Service_Name Service_Start_Type Service_Type Service_Account user | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `malicious_powershell_executed_as_a_service_filter`'
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how_to_implement: To successfully implement this search, you need to be ingesting
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Windows System logs with the Service name, Service File Name Service Start type,
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and Service Type from your endpoints.
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known_false_positives: Creating a hidden powershell service is rare and could key
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off of those instances.
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references:
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- https://www.fireeye.com/content/dam/fireeye-www/blog/pdfs/dosfuscation-report.pdf
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- http://az4n6.blogspot.com/2017/
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- https://www.danielbohannon.com/blog-1/2017/3/12/powershell-execution-argument-obfuscation-how-it-can-make-detection-easier
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tags:
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analytic_story:
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- Malicious Powershell
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confidence: 80
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context:
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- Source:Endpoint
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- Stage:Execution
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1569.002/atomic_red_team/windows-system.log
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impact: 90
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kill_chain_phases:
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- Exploitation
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message: Identifies the abuse the Windows SC.exe to execute malicious powerShell
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as a service $Service_File_Name$ by $user$ on $dest$
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mitre_attack_id:
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- T1569
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- T1569.002
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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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required_fields:
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- EventCode
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- Service_File_Name
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- Service_Type
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- _time
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- Service_Name
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- Service_Start_Type
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- Service_Account
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- user
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risk_score: 72
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security_domain: endpoint
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asset_type: Endpoint
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