Sigma rule: HackTool - F-Secure C3 Load by Rundll32

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-09b753504dee, updated 2023-03-05T00:00:00.000Z.

Rule

Title
HackTool - F-Secure C3 Load by Rundll32
Status
test
Level
critical
Author
Alfie Champion (ajpc500)
Date
2021-06-02
Modified
2023-03-05
File
rules/windows/process_creation/proc_creation_win_hktl_c3_rundll32_pattern.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

F-Secure C3 produces DLLs with a default exported StartNodeRelay function.

Log source

product
windows
category
process_creation

Detection

selection:
    CommandLine|contains|all:
        - 'rundll32.exe'
        - '.dll'
        - 'StartNodeRelay'
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.stealth
  • 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/rules/windows/process_creation/proc_creation_win_hktl_c3_rundll32_pattern.yml

Sources and licences

  • SigmaHQ

    "HackTool - F-Secure C3 Load by Rundll32" by Alfie Champion (ajpc500) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_hktl_c3_rundll32_pattern.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: HackTool - F-Secure C3 Load by Rundll32",
entity page, dataset version ref-09b753504dee, updated 2023-03-05T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/b18c9d4c-fac9-4708-bd06-dd5bfacf200f (accessed 2026-11-03).
Underlying source: SigmaHQ rule b18c9d4c-fac9-4708-bd06-dd5bfacf200f, 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.