Sigma rule: Forest Blizzard APT - JavaScript Constrained File Creation

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-69da29c08f11, updated 2024-04-23T00:00:00.000Z.

Rule

Title: Forest Blizzard APT - JavaScript Constrained File Creation
Status: test
Level: medium
Author: Nasreddine Bencherchali (Nextron Systems)
Date: 2024-04-23
File: rules-emerging-threats/2024/TA/Forest-Blizzard/file_event_win_apt_forest_blizzard_constrained_js.yml
Commit: ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the creation of JavaScript files inside of the DriverStore directory.
Forest Blizzard used this to exploit the CVE-2022-38028 vulnerability in Windows Print Spooler service by modifying a JavaScript constraints file and executing it with SYSTEM-level permissions.

Log source

product: windows
category: file_event

Detection

selection:
    TargetFilename|startswith: 'C:\Windows\System32\DriverStore\FileRepository\'
    TargetFilename|endswith: '\.js'
condition: selection

False positives (as the rule lists them)

Unlikely

MITRE ATT&CK ids this rule names

T1685.001

References

https://www.microsoft.com/en-us/security/blog/2024/04/22/analyzing-forest-blizzards-custom-post-compromise-tool-for-exploiting-cve-2022-38028-to-obtain-credentials/

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/TA/Forest-Blizzard/file_event_win_apt_forest_blizzard_constrained_js.yml

Sources and licences

SigmaHQ
"Forest Blizzard APT - JavaScript Constrained File Creation" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2024/TA/Forest-Blizzard/file_event_win_apt_forest_blizzard_constrained_js.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: Forest Blizzard APT - JavaScript Constrained File Creation",
entity page, dataset version ref-69da29c08f11, updated 2024-04-23T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/ec7c4e9b-9bc9-47c7-a32f-b53b598da642 (accessed 2026-11-03).
Underlying source: SigmaHQ rule ec7c4e9b-9bc9-47c7-a32f-b53b598da642, 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.