DotNet CLR DLL Loaded By Scripting Applications

Severity: high
Author: omkar72, oscd.community
Source: upstream

Detects .NET CLR DLLs being loaded by scripting applications such as wscript or cscript. This could be an indication of potential suspicious execution.

MITRE ATT&CK coverage

Tactic	Techniques
Privilege Escalation	`T1055` Process Injection
Defense Evasion	`T1055` Process Injection

Event coverage

Provider	Event ID	Title
Sysmon	7	Image loaded

Stages and Predicates

Stage 1: `selection`

or:
Image|endswith: '\cmstp.exe'
Image|endswith: '\cscript.exe'
Image|endswith: '\mshta.exe'
Image|endswith: '\msxsl.exe'
Image|endswith: '\regsvr32.exe'
Image|endswith: '\wmic.exe'
Image|endswith: '\wscript.exe'
or:
ImageLoaded|endswith: '\clr.dll'
ImageLoaded|endswith: '\mscoree.dll'
ImageLoaded|endswith: '\mscorlib.dll'

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.