Phoenix Studio
Convert indexed Sigma rules into analyst-ready detections.
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Indexed Rules
3,707
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Backends
17
Live from sigconverter.io
CLI Versions
10
Newest: 2.0.2
Translation Workspace
Shape the rule before it leaves Phoenix
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Active Rule
Rundll32 Execution Without CommandLine Parameters
Target Profile
Splunk
Splunk SPL & tstats data model queries
Format Mode
Default
Plain SPL queries
Conversion Output
Rundll32 Execution Without CommandLine Parameters
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: Rundll32 Execution Without CommandLine Parameters
id: 1775e15e-b61b-4d14-a1a3-80981298085a
status: test
description: Detects suspicious start of rundll32.exe without any parameters as found in CobaltStrike beacon activity
references:
- https://www.cobaltstrike.com/help-opsec
- https://twitter.com/ber_m1ng/status/1397948048135778309
author: Florian Roth (Nextron Systems)
date: 2021-05-27
modified: 2023-08-31
tags:
- attack.defense-evasion
- attack.t1202
logsource:
category: process_creation
product: windows
detection:
selection:
CommandLine|endswith:
- '\rundll32.exe'
- '\rundll32.exe"'
- '\rundll32'
filter:
ParentImage|contains:
- '\AppData\Local\'
- '\Microsoft\Edge\'
condition: selection and not filter
falsepositives:
- Possible but rare
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_rundll32_no_params.yml