Windows Process Creation: 3CXDesktopApp Execution from Known Compromised Hashes

Alerts when 3CXDesktopApp.exe executes on Windows with hash/version indicators matching known compromised binaries.

FreeReviewedSigma · High · v5

Product: windows
Category: process_creation
Author: Nasreddine Bencherchali (Nextron Systems) (SigmaHQ), DRL 1.1
Published: 2023-03-29
Updated: 2026-07-31

ATT&CK techniques

Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1218System Binary Proxy Execution
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule flags Windows executions of 3CX Desktop App when the process image hash and file metadata match a set of known compromised version artifacts. Attackers may leverage trojanized or tampered installer/executable files to establish persistence or run malicious payloads under a trusted application name. The detection relies on process creation telemetry including image file hashes and basic PE attributes such as original filename, product string, and file version patterns.

Reporting behind it

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Windows Process Creation: 3CXDesktopApp Execution from Known Compromised Hashes

Pivot detection · T1218 · 9 related

Changelog

v5
Candidate ingested via manual entry.2026-07-31
v4
Candidate ingested via manual entry.2026-07-31
v3
Candidate ingested via manual entry.2026-07-31
v2
Candidate ingested via manual entry.2026-07-31
v1
No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

windows-process-execution-of-known-compromised-3cxdesktopapp-binaries-by-hash-93bbde78

title: "Windows Process Creation: 3CXDesktopApp Execution from Known Compromised Hashes"
id: a0445a22-7957-465a-b0be-a1e95d506ff8
related:
  - id: 3c4b3bbf-36b4-470c-b6cf-f07e8b1c7e26
    type: similar
  - id: 76bc1601-9546-4b75-9419-06e0e8d10651
    type: similar
  - id: bd03a0dc-5d93-49eb-b2e8-2dfd268600f8
    type: similar
  - id: 51eecf75-d069-43c7-9ea2-63f75499edd4
    type: similar
  - id: 63f3605b-979f-48c2-b7cc-7f90523fed88
    type: similar
  - id: e7581747-1e44-4d4b-85a6-0db0b4a00f2a
    type: similar
  - id: d0b65ad3-e945-435e-a7a9-438e62dd48e9
    type: similar
  - id: 93bbde78-dc86-4e73-9ffc-ff8a384ca89c
    type: derived
status: test
description: This rule flags Windows executions of 3CX Desktop App when the process image hash and file metadata match a set of known compromised version artifacts. Attackers may leverage trojanized or tampered installer/executable files to establish persistence or run malicious payloads under a trusted application name. The detection relies on process creation telemetry including image file hashes and basic PE attributes such as original filename, product string, and file version patterns.
references:
  - https://www.reddit.com/r/crowdstrike/comments/125r3uu/20230329_situational_awareness_crowdstrike/
  - https://github.com/SigmaHQ/sigma/blob/master/rules-emerging-threats/2023/TA/3CX-Supply-Chain/proc_creation_win_malware_3cx_compromise_execution.yml
author: Nasreddine Bencherchali (Nextron Systems), Huntrule Team
date: 2023-03-29
modified: 2024-11-23
tags:
  - attack.stealth
  - attack.t1218
  - attack.execution
  - detection.emerging-threats
logsource:
  category: process_creation
  product: windows
detection:
  selection_hashes:
    Hashes|contains:
      - SHA256=DDE03348075512796241389DFEA5560C20A3D2A2EAC95C894E7BBED5E85A0ACC
      - SHA256=54004DFAA48CA5FA91E3304FB99559A2395301C570026450882D6AAD89132A02
      - SHA256=D45674F941BE3CCA2FBC1AF42778043CC18CD86D95A2ECB9E6F0E212ED4C74AE
      - SHA1=480DC408EF50BE69EBCF84B95750F7E93A8A1859
      - SHA1=3B43A5D8B83C637D00D769660D01333E88F5A187
      - SHA1=6285FFB5F98D35CD98E78D48B63A05AF6E4E4DEA
      - MD5=BB915073385DD16A846DFA318AFA3C19
      - MD5=08D79E1FFFA244CC0DC61F7D2036ACA9
      - MD5=4965EDF659753E3C05D800C6C8A23A7A
      - SHA256=FAD482DED2E25CE9E1DD3D3ECC3227AF714BDFBBDE04347DBC1B21D6A3670405
      - SHA256=5D99EFA36F34AA6B43CD81E77544961C5C8D692C96059FEF92C2DF2624550734
      - SHA256=A60A61BF844BC181D4540C9FAC53203250A982E7C3AD6153869F01E19CC36203
      - SHA1=E272715737B51C01DC2BED0F0AEE2BF6FEEF25F1
      - SHA1=8433A94AEDB6380AC8D4610AF643FB0E5220C5CB
      - SHA1=413D9CBFCBF8D1E8304EAB0AA5484F5EEC5185F5
      - MD5=9833A4779B69B38E3E51F04E395674C6
      - MD5=704DB9184700481A56E5100FB56496CE
      - MD5=8EE6802F085F7A9DF7E0303E65722DC0
      - SHA256=AA124A4B4DF12B34E74EE7F6C683B2EBEC4CE9A8EDCF9BE345823B4FDCF5D868
      - SHA256=59E1EDF4D82FAE4978E97512B0331B7EB21DD4B838B850BA46794D9C7A2C0983
      - SHA1=BEA77D1E59CF18DCE22AD9A2FAD52948FD7A9EFA
      - SHA1=BFECB8CE89A312D2EF4AFC64A63847AE11C6F69E
      - MD5=F3D4144860CA10BA60F7EF4D176CC736
      - MD5=0EEB1C0133EB4D571178B2D9D14CE3E9
  selection_pe_1:
    - OriginalFileName: 3CXDesktopApp.exe
    - Image|endswith: \3CXDesktopApp.exe
    - Product: 3CX Desktop App
  selection_pe_2:
    FileVersion|contains: 18.12.
  condition: all of selection_pe_* or selection_hashes
falsepositives:
  - Legitimate usage of 3CXDesktopApp
level: high
license: DRL-1.1

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