Overview

overview

10

Static

static

3

CK_Office.exe

windows7-x64

10

CK_Office.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    136s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    18/05/2024, 00:59

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General

  • Target
    CK_Office.exe
  • Size 3.0MB
  • Sample240518-bb35escc38
  • SHA256 c7a71cb8d400bb2c759d9f24e79f510e03b93ef47ee314d814b6b8e24bd9ff43
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10
cobaltstrikebackdoortrojan

Malware Config

Extracted

Family

  • cobaltstrike

C2

  • http://124.70.99.224:2231/xu79

Attributes
  • user_agent

    User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET4.0C; .NET4.0E)

Signatures

  • Cobaltstrike

    Detected malicious payload which is part of Cobaltstrike.

    trojanbackdoorcobaltstrike
  • Loads dropped DLL 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\CK_Office.exe
    "C:\Users\Admin\AppData\Local\Temp\CK_Office.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2580
    • C:\Users\Admin\AppData\Local\Temp\CK_Office.exe
      "C:\Users\Admin\AppData\Local\Temp\CK_Office.exe"
      2⤵
      • Loads dropped DLL
      • Suspicious use of AdjustPrivilegeToken
      PID:2708

Network

        MITRE ATT&CK Matrix

        Replay Monitor

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        Downloads

        VCRUNTIME140.dll
        • Path C:\Users\Admin\AppData\Local\Temp\_MEI25802\VCRUNTIME140.dll
        • Size 87KB
        • SHA256 bf5ff4603557c9959acec995653d052d9054ad4826df967974efd2f377c723d1
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download

        _ctypes.pyd
        • Path C:\Users\Admin\AppData\Local\Temp\_MEI25802\_ctypes.pyd
        • Size 131KB
        • SHA256 6bbde732c5bcb89455f43f370a444bb6bca321825de56f9a1f2e947b0a006f1c
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download

        base_library.zip
        • Path C:\Users\Admin\AppData\Local\Temp\_MEI25802\base_library.zip
        • Size 777KB
        • SHA256 ab3b96de6190cd8aa7d49f41530047e7aa39e4d620d79665bd88e4e1beed6a62
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download

        python37.dll
        • Path C:\Users\Admin\AppData\Local\Temp\_MEI25802\python37.dll
        • Size 3.6MB
        • SHA256 e11aa3893597d7c408349ebb11f47a24e388fd702c4d38b5d6f363f7ad6e8e5f
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download

        memory/2708-14-0x0000027203D80000-0x0000027203D81000-memory.dmp
        Download