Sigma rule: Potential APT-C-12 BlueMushroom DLL Load Activity Via Regsvr32

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-4c4cb4b6ebc7, updated 2023-03-29T00:00:00.000Z.

Rule

Title
Potential APT-C-12 BlueMushroom DLL Load Activity Via Regsvr32
Status
test
Level
medium
Author
Florian Roth (Nextron Systems), Tim Shelton, Nasreddine Bencherchali (Nextron Systems)
Date
2019-10-02
Modified
2023-03-29
File
rules-emerging-threats/2019/TA/APC-C-12/proc_creation_win_apt_aptc12_bluemushroom.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects potential BlueMushroom DLL loading activity via regsvr32 from AppData Local

Log source

product
windows
category
process_creation

Detection

selection:
    CommandLine|contains|all:
        - 'regsvr32'
        - '\AppData\Local\'
        - '.dll'
        - ',DllEntry'
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.stealth
  • attack.t1218.010
  • 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/2019/TA/APC-C-12/proc_creation_win_apt_aptc12_bluemushroom.yml

Sources and licences

  • SigmaHQ

    "Potential APT-C-12 BlueMushroom DLL Load Activity Via Regsvr32" by Florian Roth (Nextron Systems), Tim Shelton, Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2019/TA/APC-C-12/proc_creation_win_apt_aptc12_bluemushroom.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: Potential APT-C-12 BlueMushroom DLL Load Activity Via Regsvr32",
entity page, dataset version ref-4c4cb4b6ebc7, updated 2023-03-29T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/bd70d3f8-e60e-4d25-89f0-0b5a9cff20e0 (accessed 2026-11-03).
Underlying source: SigmaHQ rule bd70d3f8-e60e-4d25-89f0-0b5a9cff20e0, 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.