Sigma rule: Kapeka Backdoor Loaded Via Rundll32.EXE

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-619ecb038ec9, updated 2024-07-03T00:00:00.000Z.

Rule

Title
Kapeka Backdoor Loaded Via Rundll32.EXE
Status
test
Level
high
Author
Swachchhanda Shrawan Poudel
Date
2024-07-03
File
rules-emerging-threats/2024/Malware/kapeka/image_load_malware_kapeka_backdoor_wll.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the Kapeka Backdoor binary being loaded by rundll32.exe.
The Kapeka loader drops a backdoor, which is a DLL with the '.wll' extension masquerading as a Microsoft Word Add-In.

Log source

product
windows
category
image_load

Detection

selection:
    Image|endswith: '\rundll32.exe'
    ImageLoaded|contains:
        - ':\ProgramData'
        - '\AppData\Local\'
    ImageLoaded|re: '[a-zA-Z]{5,6}\.wll'
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.execution
  • attack.stealth
  • attack.t1204.002
  • attack.t1218.011
  • detection.emerging-threats

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-emerging-threats/2024/Malware/kapeka/image_load_malware_kapeka_backdoor_wll.yml

Sources and licences

  • SigmaHQ

    "Kapeka Backdoor Loaded Via Rundll32.EXE" by Swachchhanda Shrawan Poudel (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2024/Malware/kapeka/image_load_malware_kapeka_backdoor_wll.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: Kapeka Backdoor Loaded Via Rundll32.EXE",
entity page, dataset version ref-619ecb038ec9, updated 2024-07-03T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/a7e6b1f9-8d2c-4f1e-9a7d-63e4c8a2bf4c (accessed 2026-11-03).
Underlying source: SigmaHQ rule a7e6b1f9-8d2c-4f1e-9a7d-63e4c8a2bf4c, 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.