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Detection rules › Sigma

Remote DLL Load Via Rundll32.EXE

Status
test
Severity
medium
Log source
product windows, category image_load
Author
Nasreddine Bencherchali (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects a remote DLL load event via "rundll32.exe".

MITRE ATT&CK coverage

TacticTechniques
ExecutionT1204.002 User Execution: Malicious File

Event coverage

ProviderEventTitle
SysmonEvent ID 7Image loaded

Rule body yaml

title: Remote DLL Load Via Rundll32.EXE
id: f40017b3-cb2e-4335-ab5d-3babf679c1de
status: test
description: Detects a remote DLL load event via "rundll32.exe".
references:
    - https://github.com/gabe-k/themebleed
    - Internal Research
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-09-18
tags:
    - attack.execution
    - attack.t1204.002
logsource:
    category: image_load
    product: windows
detection:
    selection:
        Image|endswith: '\rundll32.exe'
        ImageLoaded|startswith: '\\\\'
    condition: selection
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    Image|endswith: '\rundll32.exe'
    ImageLoaded|startswith: '\\\\'

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
Imageends_with
  • \rundll32.exe corpus 95 (sigma 95)
ImageLoadedstarts_with
  • \\\\ corpus 2 (sigma 1, splunk 1)