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pyth0n1c
73 lines
3.5 KiB
YAML
73 lines
3.5 KiB
YAML
name: Powershell COM Hijacking InprocServer32 Modification
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id: ea61e291-af05-4716-932a-67faddb6ae6f
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version: 5
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date: '2025-02-10'
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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 detects attempts to modify or add a Component
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Object Model (COM) entry to the InProcServer32 path within the registry using PowerShell.
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It leverages PowerShell ScriptBlock Logging (EventCode 4104) to identify suspicious
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script blocks that target the InProcServer32 registry path. This activity is significant
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because modifying COM objects can be used for persistence or privilege escalation
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by attackers. If confirmed malicious, this could allow an attacker to execute arbitrary
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code or maintain persistent access to the compromised system, posing a severe security
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risk.
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data_source:
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- Powershell Script Block Logging 4104
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search: '`powershell` EventCode=4104 ScriptBlockText = "*Software\\Classes\\CLSID\\*\\InProcServer32*"
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| stats count min(_time) as firstTime max(_time) as lastTime by EventCode ScriptBlockText
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Computer UserID | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `powershell_com_hijacking_inprocserver32_modification_filter`'
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how_to_implement: The following analytic requires PowerShell operational logs to be
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imported. Modify the PowerShell macro as needed to match the sourcetype or add index.
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This analytic is specific to 4104, or PowerShell Script Block Logging.
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known_false_positives: False positives will be present if any scripts are adding to
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inprocserver32. Filter as needed.
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references:
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- https://attack.mitre.org/techniques/T1546/015/
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- https://www.splunk.com/en_us/blog/security/hunting-for-malicious-powershell-using-script-block-logging.html
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- https://blog.cluster25.duskrise.com/2022/09/23/in-the-footsteps-of-the-fancy-bear-powerpoint-graphite/
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- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1546.015/T1546.015.md
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drilldown_searches:
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- name: View the detection results for - "$Computer$"
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search: '%original_detection_search% | search Computer = "$Computer$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$Computer$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$Computer$")
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starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime
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values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories)
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as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic)
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as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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message: A PowerShell script has been identified with InProcServer32 within the
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script code on $Computer$.
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risk_objects:
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- field: Computer
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type: system
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score: 64
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threat_objects: []
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tags:
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analytic_story:
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- Malicious PowerShell
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asset_type: Endpoint
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mitre_attack_id:
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- T1059.001
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- T1546.015
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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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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:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1546.015/atomic_red_team/windows-powershell.log
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source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
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sourcetype: XmlWinEventLog
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