Detection rules › Sigma

Potential Arbitrary DLL Load Using Winword

Severity
medium
Author
Victor Sergeev, oscd.community
Source
upstream

Detects potential DLL sideloading using the Microsoft Office winword process via the '/l' flag.

MITRE ATT&CK coverage

TacticTechniques
Defense EvasionT1202 Indirect Command Execution

Event coverage

ProviderEvent IDTitle
Sysmon1Process creation

Stages and Predicates

Stage 1: all of selection_img

or:
Image|endswith: '\WINWORD.exe'
OriginalFileName: WinWord.exe

Stage 2: all of selection_dll

CommandLine|contains: .dll
CommandLine|contains: '/l '

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
  • .dll corpus 15 (sigma 15)
  • /l
Imageends_with
  • \WINWORD.exe corpus 5 (sigma 5)
OriginalFileNameeq
  • WinWord.exe corpus 4 (sigma 4)