DLL Loaded From Suspicious Location Via Cmspt.EXE

Severity: high
Author: Nasreddine Bencherchali (Nextron Systems)
Source: upstream

Detects cmstp loading "dll" or "ocx" files from suspicious locations

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1218.003` System Binary Proxy Execution: CMSTP

Event coverage

Provider	Event ID	Title
Sysmon	7	Image loaded

Stages and Predicates

Stage 1: `selection`

or:
ImageLoaded|endswith: .dll
ImageLoaded|endswith: .ocx
or:
ImageLoaded|contains: 'C:\Temp\'
ImageLoaded|contains: '\PerfLogs\'
ImageLoaded|contains: '\ProgramData\'
ImageLoaded|contains: '\Users\'
ImageLoaded|contains: '\Windows\Temp\'
Image|endswith: '\cmstp.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.