Potential Compromised 3CXDesktopApp ICO C2 File Download

calendar Aug 12, 2024 · attack.command-and-control detection.emerging-threats  ·
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Detects potential malicious .ICO files download from a compromised 3CXDesktopApp via web requests to the the malicious Github repository

Sigma rule (View on GitHub)

 1title: Potential Compromised 3CXDesktopApp ICO C2 File Download
 2id: 76bc1601-9546-4b75-9419-06e0e8d10651
 3related:
 4    - id: 3c4b3bbf-36b4-470c-b6cf-f07e8b1c7e26 # Proxy C2
 5      type: similar
 6    - id: bd03a0dc-5d93-49eb-b2e8-2dfd268600f8 # DNS C2
 7      type: similar
 8    - id: 51eecf75-d069-43c7-9ea2-63f75499edd4 # net_connection C2
 9      type: similar
10    - id: 93bbde78-dc86-4e73-9ffc-ff8a384ca89c # ProcCreation Exec
11      type: similar
12    - id: 63f3605b-979f-48c2-b7cc-7f90523fed88 # ProcCreation ChildProc
13      type: similar
14    - id: e7581747-1e44-4d4b-85a6-0db0b4a00f2a # ProcCreation Update
15      type: similar
16    - id: d0b65ad3-e945-435e-a7a9-438e62dd48e9 # ImageLoad
17      type: similar
18status: test
19description: Detects potential malicious .ICO files download from a compromised 3CXDesktopApp via web requests to the the malicious Github repository
20references:
21    - https://www.sentinelone.com/blog/smoothoperator-ongoing-campaign-trojanizes-3cx-software-in-software-supply-chain-attack/
22    - https://www.linkedin.com/feed/update/urn:li:activity:7047435754834198529/
23author: Nasreddine Bencherchali (Nextron Systems)
24date: 2023-03-31
25tags:
26    - attack.command-and-control
27    - detection.emerging-threats
28logsource:
29    category: proxy
30detection:
31    selection:
32        c-uri|contains|all:
33            - 'IconStorages/images/main/icon'
34            - '.ico'
35    condition: selection
36falsepositives:
37    - Unknown
38level: high

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