Sigma rule: Suspicious Rundll32 Script in CommandLine

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-1eaa8408e410, updated 2024-02-23T00:00:00.000Z.

SigmaHQ marks this rule as deprecated.

Rule

Title
Suspicious Rundll32 Script in CommandLine
Status
deprecated
Level
medium
Author
frack113, Zaw Min Htun (ZETA)
Date
2021/12/04
Modified
2024/02/23
File
deprecated/windows/proc_creation_win_rundll32_script_run.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects suspicious process related to rundll32 based on arguments

Log source

product
windows
category
process_creation

Detection

selection1:
    CommandLine|contains: 'rundll32'
selection2:
    CommandLine|contains:
        - 'mshtml,RunHTMLApplication'
        - 'mshtml,#135'
selection3:
    CommandLine|contains:
        - 'javascript:'
        - 'vbscript:'
condition: all of selection*

False positives (as the rule lists them)

  • False positives depend on scripts and administrative tools used in the monitored environment

Tags

  • attack.defense_evasion
  • attack.t1218.011

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/deprecated/windows/proc_creation_win_rundll32_script_run.yml

Sources and licences

  • SigmaHQ

    "Suspicious Rundll32 Script in CommandLine" by frack113, Zaw Min Htun (ZETA) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/deprecated/windows/proc_creation_win_rundll32_script_run.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Suspicious Rundll32 Script in CommandLine",
entity page, dataset version ref-1eaa8408e410, updated 2024-02-23T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/73fcad2e-ff14-4c38-b11d-4172c8ac86c7 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 73fcad2e-ff14-4c38-b11d-4172c8ac86c7, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.