Verclsid.exe Runs COM Object

Severity: medium
Author: Victor Sergeev, oscd.community
Source: upstream

Detects when verclsid.exe is used to run COM object via GUID

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1218` System Binary Proxy Execution

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_img`

or:
Image|endswith: '\verclsid.exe'
OriginalFileName: verclsid.exe

Stage 2: `all of selection_cli`

CommandLine|contains: '/C'
CommandLine|contains: '/S'

Stage 3: `not 1 of filter_main_runtimebroker`

CommandLine|contains: 'verclsid.exe" /S /C {'
CommandLine|contains: '} /I {'
ParentImage|endswith: 'C:\Windows\System32\RuntimeBroker.exe'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`CommandLine`	match	`/C` corpus 3 (sigma 3) `/S` `verclsid.exe" /S /C {` `} /I {`
`Image`	ends_with	`\verclsid.exe` corpus 4 (sigma 4)
`OriginalFileName`	eq	`verclsid.exe`
`ParentImage`	ends_with	`C:\Windows\System32\RuntimeBroker.exe`