Sigma rule: Potential Persistence Via CHM Helper DLL

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-18bb128147e6, updated 2023-08-17T00:00:00.000Z.

Rule

Title
Potential Persistence Via CHM Helper DLL
Status
test
Level
high
Author
Nasreddine Bencherchali (Nextron Systems)
Date
2022-07-21
Modified
2023-08-17
File
rules/windows/registry/registry_set/registry_set_persistence_chm.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects when an attacker modifies the registry key "HtmlHelp Author" to achieve persistence

Log source

product
windows
category
registry_set

Detection

selection:
    TargetObject|contains:
        - '\Software\Microsoft\HtmlHelp Author\Location'
        - '\Software\WOW6432Node\Microsoft\HtmlHelp Author\Location'
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.persistence

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/registry/registry_set/registry_set_persistence_chm.yml

Sources and licences

  • SigmaHQ

    "Potential Persistence Via CHM Helper DLL" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/registry/registry_set/registry_set_persistence_chm.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 Persistence Via CHM Helper DLL",
entity page, dataset version ref-18bb128147e6, updated 2023-08-17T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/976dd1f2-a484-45ec-aa1d-0e87e882262b (accessed 2026-11-03).
Underlying source: SigmaHQ rule 976dd1f2-a484-45ec-aa1d-0e87e882262b, 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.