Detection rules › Sigma

DLL Loaded via CertOC.EXE

Severity
medium
Author
Austin Songer @austinsonger
Source
upstream

Detects when a user installs certificates by using CertOC.exe to loads the target DLL file.

MITRE ATT&CK coverage

TacticTechniques
Defense EvasionT1218 System Binary Proxy Execution

Event coverage

ProviderEvent IDTitle
Sysmon1Process creation

Stages and Predicates

Stage 1: all of selection_img

or:
Image|endswith: '\certoc.exe'
OriginalFileName: CertOC.exe

Stage 2: all of selection_cli

CommandLine|contains: ' -LoadDLL '

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.

FieldKindValues
CommandLinematch
  • -LoadDLL corpus 2 (sigma 2)
Imageends_with
  • \certoc.exe corpus 10 (sigma 10)
OriginalFileNameeq
  • CertOC.exe corpus 6 (sigma 6)