Detection rules › Sigma
Rundll32 UNC Path Execution
Detects rundll32 execution where the DLL is located on a remote location (share)
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Stealth | T1218.011 System Binary Proxy Execution: Rundll32 |
| Lateral Movement | T1021.002 Remote Services: SMB/Windows Admin Shares |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
Rule body yaml
title: Rundll32 UNC Path Execution
id: 5cdb711b-5740-4fb2-ba88-f7945027afac
status: test
description: Detects rundll32 execution where the DLL is located on a remote location (share)
references:
- https://www.cybereason.com/blog/rundll32-the-infamous-proxy-for-executing-malicious-code
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-08-10
tags:
- attack.execution
- attack.lateral-movement
- attack.stealth
- attack.t1021.002
- attack.t1218.011
logsource:
category: process_creation
product: windows
detection:
selection_img:
- Image|endswith: '\rundll32.exe'
- OriginalFileName: 'RUNDLL32.EXE'
- CommandLine|contains: 'rundll32'
selection_cli:
CommandLine|contains: ' \\\\'
condition: all of selection_*
falsepositives:
- Unlikely
level: high
Stages and Predicates
Stage 0: condition
all of selection_*Stage 1: selection_img
selection_img:
- Image|endswith: '\rundll32.exe'
- OriginalFileName: 'RUNDLL32.EXE'
- CommandLine|contains: 'rundll32'
Stage 2: selection_cli
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.
| Field | Kind | Values |
|---|---|---|
CommandLine | match |
|
Image | ends_with |
|
OriginalFileName | eq |
|