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Active Rule
Regsvr32 DLL Execution With Uncommon Extension
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Regsvr32 DLL Execution With Uncommon Extension
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: Regsvr32 DLL Execution With Uncommon Extension
id: 50919691-7302-437f-8e10-1fe088afa145
status: test
description: Detects a "regsvr32" execution where the DLL doesn't contain a common file extension.
references:
- https://app.any.run/tasks/34221348-072d-4b70-93f3-aa71f6ebecad/
author: Florian Roth (Nextron Systems)
date: 2019-07-17
modified: 2023-05-24
tags:
- attack.privilege-escalation
- attack.persistence
- attack.defense-evasion
- attack.t1574
- attack.execution
logsource:
category: process_creation
product: windows
detection:
selection:
- Image|endswith: '\regsvr32.exe'
- OriginalFileName: 'REGSVR32.EXE'
filter_main_legit_ext:
CommandLine|contains:
# Note: For better accuracy you might not want to use contains
- '.ax'
- '.cpl'
- '.dll' # Covers ".dll.mui"
- '.ocx'
filter_optional_pascal:
CommandLine|contains: '.ppl'
filter_optional_avg:
CommandLine|contains: '.bav'
filter_main_null_4688:
CommandLine: null
filter_main_empty_4688:
CommandLine: ''
condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
falsepositives:
- Other legitimate extensions currently not in the list either from third party or specific Windows components.
level: medium
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_regsvr32_uncommon_extension.yml