Malicious DLL Load By Compromised 3CXDesktopApp

 1title: Malicious DLL Load By Compromised 3CXDesktopApp
 2id: d0b65ad3-e945-435e-a7a9-438e62dd48e9
 3related:
 4    - id: 3c4b3bbf-36b4-470c-b6cf-f07e8b1c7e26 # Proxy C2
 5      type: similar
 6    - id: 76bc1601-9546-4b75-9419-06e0e8d10651 # Proxy GH
 7      type: similar
 8    - id: bd03a0dc-5d93-49eb-b2e8-2dfd268600f8 # DNS C2
 9      type: similar
10    - id: 51eecf75-d069-43c7-9ea2-63f75499edd4 # net_connection C2
11      type: similar
12    - id: 93bbde78-dc86-4e73-9ffc-ff8a384ca89c # ProcCreation Exec
13      type: similar
14    - id: 63f3605b-979f-48c2-b7cc-7f90523fed88 # ProcCreation ChildProc
15      type: similar
16    - id: e7581747-1e44-4d4b-85a6-0db0b4a00f2a # ProcCreation Update
17      type: similar
18status: test
19description: Detects DLL load activity of known compromised DLLs used in by the compromised 3CXDesktopApp
20references:
21    - https://www.microsoft.com/security/blog/2021/09/27/foggyweb-targeted-nobelium-malware-leads-to-persistent-backdoor/
22author: Nasreddine Bencherchali (Nextron Systems)
23date: 2023/03/31
24tags:
25    - attack.defense_evasion
26    - detection.emerging_threats
27logsource:
28    category: image_load
29    product: windows
30detection:
31    selection_hashes_1:
32        Hashes|contains:
33            # ffmpeg.dll
34            - 'SHA256=7986BBAEE8940DA11CE089383521AB420C443AB7B15ED42AED91FD31CE833896'
35            - 'SHA1=BF939C9C261D27EE7BB92325CC588624FCA75429'
36            - 'MD5=74BC2D0B6680FAA1A5A76B27E5479CBC'
37            # d3dcompiler_47.dll
38            - 'SHA256=11BE1803E2E307B647A8A7E02D128335C448FF741BF06BF52B332E0BBF423B03'
39            - 'SHA1=20D554A80D759C50D6537DD7097FED84DD258B3E'
40            - 'MD5=82187AD3F0C6C225E2FBA0C867280CC9'
41            # Inner object from ffmpeg.dll
42            - 'SHA256=F79C3B0ADB6EC7BCC8BC9AE955A1571AAED6755A28C8B17B1D7595EE86840952'
43            - 'SHA1=894E7D4FFD764BB458809C7F0643694B036EAD30'
44            - 'MD5=11BC82A9BD8297BD0823BCE5D6202082'
45            # ICONIC Stealer payload
46            - 'SHA256=8AB3A5EAAF8C296080FADF56B265194681D7DA5DA7C02562953A4CB60E147423'
47            - 'SHA1=3B3E778B647371262120A523EB873C20BB82BEAF'
48            - 'MD5=7FAEA2B01796B80D180399040BB69835'
49    selection_hashes_2:
50        - sha256:
51              - '7986BBAEE8940DA11CE089383521AB420C443AB7B15ED42AED91FD31CE833896'
52              - '11BE1803E2E307B647A8A7E02D128335C448FF741BF06BF52B332E0BBF423B03'
53              - 'F79C3B0ADB6EC7BCC8BC9AE955A1571AAED6755A28C8B17B1D7595EE86840952'
54              - '8AB3A5EAAF8C296080FADF56B265194681D7DA5DA7C02562953A4CB60E147423'
55        - sha1:
56              - 'BF939C9C261D27EE7BB92325CC588624FCA75429'
57              - '20D554A80D759C50D6537DD7097FED84DD258B3E'
58              - '894E7D4FFD764BB458809C7F0643694B036EAD30'
59              - '3B3E778B647371262120A523EB873C20BB82BEAF'
60        - md5:
61              - '74BC2D0B6680FAA1A5A76B27E5479CBC'
62              - '82187AD3F0C6C225E2FBA0C867280CC9'
63              - '11BC82A9BD8297BD0823BCE5D6202082'
64              - '7FAEA2B01796B80D180399040BB69835'
65    condition: 1 of selection_*
66falsepositives:
67    - Unlikely
68level: critical