Sigma rule: Creation of a Diagcab

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-053cc6db6b07, updated 2022-06-08T00:00:00.000Z.

Rule

Title
Creation of a Diagcab
Status
test
Level
medium
Author
frack113
Date
2022-06-08
File
rules/windows/file/file_event/file_event_win_susp_diagcab.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the creation of diagcab file, which could be caused by some legitimate installer or is a sign of exploitation (review the filename and its location)

Log source

product
windows
category
file_event

Detection

selection:
    TargetFilename|endswith: '.diagcab'
condition: selection

False positives (as the rule lists them)

  • Legitimate microsoft diagcab

Tags

  • attack.resource-development

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/file/file_event/file_event_win_susp_diagcab.yml

Sources and licences

  • SigmaHQ

    "Creation of a Diagcab" by frack113 (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/file/file_event/file_event_win_susp_diagcab.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: Creation of a Diagcab",
entity page, dataset version ref-053cc6db6b07, updated 2022-06-08T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/3d0ed417-3d94-4963-a562-4a92c940656a (accessed 2026-11-03).
Underlying source: SigmaHQ rule 3d0ed417-3d94-4963-a562-4a92c940656a, 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.