Sigma rule: Malicious DLL Load By Compromised 3CXDesktopApp

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-ff4667c70545, updated 2024-11-23T00:00:00.000Z.

Rule

Title: Malicious DLL Load By Compromised 3CXDesktopApp
Status: test
Level: critical
Author: Nasreddine Bencherchali (Nextron Systems)
Date: 2023-03-31
Modified: 2024-11-23
File: rules-emerging-threats/2023/TA/3CX-Supply-Chain/image_load_malware_3cx_compromise_susp_dll.yml
Commit: ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects DLL load activity of known compromised DLLs used in by the compromised 3CXDesktopApp

Log source

product: windows
category: image_load

Detection

selection:
    Hashes|contains:
        # ffmpeg.dll
        - 'SHA256=7986BBAEE8940DA11CE089383521AB420C443AB7B15ED42AED91FD31CE833896'
        - 'SHA1=BF939C9C261D27EE7BB92325CC588624FCA75429'
        - 'MD5=74BC2D0B6680FAA1A5A76B27E5479CBC'
        # d3dcompiler_47.dll
        - 'SHA256=11BE1803E2E307B647A8A7E02D128335C448FF741BF06BF52B332E0BBF423B03'
        - 'SHA1=20D554A80D759C50D6537DD7097FED84DD258B3E'
        - 'MD5=82187AD3F0C6C225E2FBA0C867280CC9'
        # Inner object from ffmpeg.dll
        - 'SHA256=F79C3B0ADB6EC7BCC8BC9AE955A1571AAED6755A28C8B17B1D7595EE86840952'
        - 'SHA1=894E7D4FFD764BB458809C7F0643694B036EAD30'
        - 'MD5=11BC82A9BD8297BD0823BCE5D6202082'
        # ICONIC Stealer payload
        - 'SHA256=8AB3A5EAAF8C296080FADF56B265194681D7DA5DA7C02562953A4CB60E147423'
        - 'SHA1=3B3E778B647371262120A523EB873C20BB82BEAF'
        - 'MD5=7FAEA2B01796B80D180399040BB69835'
condition: selection

False positives (as the rule lists them)

Unlikely

Related rules

References

https://www.microsoft.com/security/blog/2021/09/27/foggyweb-targeted-nobelium-malware-leads-to-persistent-backdoor/

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/2023/TA/3CX-Supply-Chain/image_load_malware_3cx_compromise_susp_dll.yml

Sources and licences

SigmaHQ
"Malicious DLL Load By Compromised 3CXDesktopApp" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2023/TA/3CX-Supply-Chain/image_load_malware_3cx_compromise_susp_dll.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: Malicious DLL Load By Compromised 3CXDesktopApp",
entity page, dataset version ref-ff4667c70545, updated 2024-11-23T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/d0b65ad3-e945-435e-a7a9-438e62dd48e9 (accessed 2026-11-03).
Underlying source: SigmaHQ rule d0b65ad3-e945-435e-a7a9-438e62dd48e9, 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.