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Active Rule

Suspicious Usage Of ShellExec_RunDLL

sigma-cli version

Backend

Format

Target Profile

Splunk

Splunk SPL & tstats data model queries

Format Mode

Default

Plain SPL queries

Conversion Output

Suspicious Usage Of ShellExec_RunDLL

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: Suspicious Usage Of ShellExec_RunDLL
id: d87bd452-6da1-456e-8155-7dc988157b7d
related:
    - id: 36c5146c-d127-4f85-8e21-01bf62355d5a
      type: obsolete
    - id: 8823e85d-31d8-473e-b7f4-92da070f0fc6
      type: similar
status: test
description: Detects suspicious usage of the ShellExec_RunDLL function to launch other commands as seen in the the raspberry-robin attack
references:
    - https://redcanary.com/blog/raspberry-robin/
    - https://www.microsoft.com/en-us/security/blog/2022/10/27/raspberry-robin-worm-part-of-larger-ecosystem-facilitating-pre-ransomware-activity/
    - https://github.com/SigmaHQ/sigma/issues/1009
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-09-01
modified: 2022-12-30
tags:
    - attack.defense-evasion
logsource:
    category: process_creation
    product: windows
detection:
    selection_openasrundll:
        CommandLine|contains: 'ShellExec_RunDLL'
    selection_suspcli:
        CommandLine|contains:
            # Note: The ordinal number may differ depending on the DLL version
            - '\Desktop\'
            - '\Temp\'
            - '\Users\Public\'
            - 'comspec'
            - 'iex'
            - 'Invoke-'
            - 'msiexec'
            - 'odbcconf'
            - 'regsvr32'
    condition: all of selection_*
falsepositives:
    - Unknown
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_susp_shellexec_execution.yml