splApache-2.0from splunk/security_content

Verclsid CLSID Execution

The following analytic detects the potential abuse of the verclsid.exe utility to execute malicious files via generated CLSIDs. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on specific command-line patterns associated with verclsid.exe. This activity is significant because verclsid.exe is a legitimate Windows application used to verify CLSID COM objects, and its misuse can indicate an attempt to bypass security controls. If confirmed malicious, this technique could allow an attacker to execute arbitrary code, potentially leading to system compromise or further malicious activities.

Quality

FP risk

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Forks

Views

Rule sourcedetections/endpoint/verclsid_clsid_execution.yml

| tstats `security_content_summariesonly` values(Processes.process) as process
values(Processes.parent_process) as parent_process values(Processes.process_id)
as process_id count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where
(Processes.process_name="verclsid.exe" OR Processes.original_file_name="verclsid.exe")
Processes.process="*/S*"
Processes.process="*/C*"
Processes.process="*{*"
Processes.process="*}*"
by Processes.action Processes.dest Processes.original_file_name
   Processes.parent_process Processes.parent_process_exec Processes.parent_process_guid
   Processes.parent_process_id Processes.parent_process_name Processes.parent_process_path
   Processes.process Processes.process_exec Processes.process_guid Processes.process_hash
   Processes.process_id Processes.process_integrity_level Processes.process_name Processes.process_path
   Processes.user Processes.user_id Processes.vendor_product
| `drop_dm_object_name(Processes)`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `verclsid_clsid_execution_filter`