Detection rules › Sigma

Suspicious Regsvr32 Execution From Remote Share

Severity
high
Author
Nasreddine Bencherchali (Nextron Systems)
Source
upstream

Detects REGSVR32.exe to execute DLL hosted on remote shares

MITRE ATT&CK coverage

TacticTechniques
Defense EvasionT1218.010 System Binary Proxy Execution: Regsvr32

Event coverage

ProviderEvent IDTitle
Sysmon1Process creation

Stages and Predicates

Stage 1: all of selection_img

or:
Image|endswith: '\regsvr32.exe'
OriginalFileName: '\REGSVR32.EXE'

Stage 2: all of selection_cli

CommandLine|contains: ' \\\\'

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
  • \\\\ corpus 8 (sigma 8)
Imageends_with
  • \regsvr32.exe corpus 57 (sigma 57)
OriginalFileNameeq
  • \REGSVR32.EXE