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P4T12ICK
78 lines
2.9 KiB
YAML
78 lines
2.9 KiB
YAML
name: Verclsid CLSID Execution
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id: 61e9a56a-20fa-11ec-8ba3-acde48001122
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version: 1
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date: '2021-09-29'
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author: Teoderick Contreras, Splunk
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type: Hunting
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datamodel:
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- Endpoint
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description: This analytic is to detect a possible abuse of verclsid to execute malicious
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file through generate CLSID. This process is a normal application of windows to
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verify the CLSID COM object before it is instantiated by Windows Explorer. This
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hunting query can be a good pivot point to analyze what is he CLSID or COM object
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pointing too to check if it is a valid application or not.
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search: '| tstats `security_content_summariesonly` values(Processes.process) as process
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values(Processes.parent_process) as parent_process values(Processes.process_id)
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as process_id count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes
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where `process_verclsid` AND Processes.process="*/S*" Processes.process="*/C*" AND Processes.process="*{*"
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AND Processes.process="*}*" by Processes.process_name Processes.original_file_name
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Processes.dest Processes.user Processes.parent_process_name Processes.parent_process
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `verclsid_clsid_execution_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition,
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confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
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endpoint product.
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known_false_positives: windows can used this application for its normal COM object
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validation.
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references:
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- https://gist.github.com/NickTyrer/0598b60112eaafe6d07789f7964290d5
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- https://bohops.com/2018/08/18/abusing-the-com-registry-structure-part-2-loading-techniques-for-evasion-and-persistence/
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tags:
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analytic_story:
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- Unusual Processes
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confidence: 50
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context:
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- Source:Endpoint
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- Stage:Defense Evasion
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1218.012/verclsid_exec/sysmon.log
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impact: 50
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kill_chain_phases:
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- Exploitation
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message: process $process_name$ to execute possible clsid commandline $process$
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in $dest$
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mitre_attack_id:
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- T1218.012
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- T1218
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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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- 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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- _time
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- Processes.dest
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- Processes.user
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- Processes.parent_process_name
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- Processes.parent_process
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- Processes.original_file_name
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_path
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- Processes.process_path
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- Processes.parent_process_id
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risk_score: 25
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security_domain: endpoint
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asset_type: Endpoint
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