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pyth0n1c
74 lines
3.3 KiB
YAML
74 lines
3.3 KiB
YAML
name: Powershell Execute COM Object
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id: 65711630-f9bf-11eb-8d72-acde48001122
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version: 4
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date: '2024-09-30'
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author: Teoderick Contreras, Splunk
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status: production
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type: TTP
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description: The following analytic detects the execution of a COM CLSID through PowerShell.
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It leverages EventCode 4104 and searches for specific script block text indicating
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the creation of a COM object. This activity is significant as it is commonly used
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by adversaries and malware, such as the Conti ransomware, to execute commands, potentially
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for privilege escalation or bypassing User Account Control (UAC). If confirmed malicious,
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this technique could allow attackers to gain elevated privileges or persist within
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the environment, posing a significant security 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 = "*CreateInstance([type]::GetTypeFromCLSID*"
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| stats count min(_time) as firstTime max(_time) as lastTime by EventCode ScriptBlockText
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Computer UserID | rename Computer as dest | rename UserID as user | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `powershell_execute_com_object_filter`'
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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: network operrator may use this command.
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references:
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- https://threadreaderapp.com/thread/1423361119926816776.html
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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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drilldown_searches:
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- name: View the detection results for - "$dest$"
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search: '%original_detection_search% | search dest = "$dest$"'
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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 - "$dest$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$")
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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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tags:
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analytic_story:
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- Ransomware
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- Malicious PowerShell
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- Hermetic Wiper
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- Data Destruction
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asset_type: Endpoint
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confidence: 50
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impact: 10
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message: A suspicious powershell script contains COM CLSID command on host $dest$
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mitre_attack_id:
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- T1546.015
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- T1546
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- T1059.001
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observable:
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- name: dest
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type: Hostname
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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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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/pwh_com_object/windows-powershell-xml.log
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source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
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sourcetype: XmlWinEventLog
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