Sigma rule: Potential Regsvr32 Commandline Flag Anomaly

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-692740df64ee, updated 2024-03-13T00:00:00.000Z.

Rule

Title
Potential Regsvr32 Commandline Flag Anomaly
Status
test
Level
medium
Author
Florian Roth (Nextron Systems)
Date
2019-07-13
Modified
2024-03-13
File
rules/windows/process_creation/proc_creation_win_regsvr32_flags_anomaly.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects a potential command line flag anomaly related to "regsvr32" in which the "/i" flag is used without the "/n" which should be uncommon.

Log source

product
windows
category
process_creation

Detection

selection:
    Image|endswith: '\regsvr32.exe'
    CommandLine|contains|windash: ' -i:'
filter_main_flag:
    CommandLine|contains|windash: ' -n '
condition: selection and not 1 of filter_main_*

False positives (as the rule lists them)

  • Administrator typo might cause some false positives

Tags

  • attack.stealth
  • attack.t1218.010

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_regsvr32_flags_anomaly.yml

Sources and licences

  • SigmaHQ

    "Potential Regsvr32 Commandline Flag Anomaly" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_regsvr32_flags_anomaly.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 Regsvr32 Commandline Flag Anomaly",
entity page, dataset version ref-692740df64ee, updated 2024-03-13T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/b236190c-1c61-41e9-84b3-3fe03f6d76b0 (accessed 2026-11-03).
Underlying source: SigmaHQ rule b236190c-1c61-41e9-84b3-3fe03f6d76b0, 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.