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Newest: 2.0.2
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Active Rule
Potential Renamed Rundll32 Execution
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Potential Renamed Rundll32 Execution
Using Splunk · Default · sigma-cli 2.0.2
Translation controls
Adjust the rule on the left, then regenerate when you want a fresh backend-native query.
BackendSplunkFormatDefaultVersion2.0.2
title: Potential Renamed Rundll32 Execution
id: 2569ed8c-1147-498a-9b8c-2ad3656b10ed
related:
- id: 0ba1da6d-b6ce-4366-828c-18826c9de23e
type: derived
status: test
description: Detects when 'DllRegisterServer' is called in the commandline and the image is not rundll32. This could mean that the 'rundll32' utility has been renamed in order to avoid detection
references:
- https://twitter.com/swisscom_csirt/status/1331634525722521602?s=20
- https://app.any.run/tasks/f74c5157-8508-4ac6-9805-d63fe7b0d399/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-08-22
modified: 2023-02-03
tags:
- attack.execution
logsource:
category: process_creation
product: windows
detection:
selection:
CommandLine|contains: 'DllRegisterServer'
filter:
Image|endswith: '\rundll32.exe'
condition: selection and not filter
falsepositives:
- Unlikely
level: high
CLI command
Copy the exact command to reproduce this translation locally.
sigma convert --without-pipeline -t splunk -f default rules/windows/process_creation/proc_creation_win_renamed_rundll32_dllregisterserver.yml