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Analysis

  • max time kernel
    133s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13/11/2024, 14:02

General

  • Target

    Realtek HD Audio Universal Service.exe

  • Size

    40KB

  • MD5

    876020bf5050a2b498b45cb65d89f067

  • SHA1

    7f7ace329e3c77e14fc5bb11d1797e5f61f96859

  • SHA256

    9e2cc1e98ba3672218c8fbdeb5c8831c340a25c4b425ee32bf45527577c8eb2c

  • SHA512

    f168fe3bb22c1947036418737845c9200c5642fec69d24a982d47d2c0da9502e8e8e86268fae5c39f28ab8267fc4cb2644a9e27a4f8b898dfafd4c5b801fd7c0

  • SSDEEP

    768:MBj78fx6MooenBjJfDUbtRFH9OKl6BOMhXL05jh:o78p6MLeBjJfIbDFH93l6BOMFkjh

Malware Config

Extracted

Family

xworm

Version

5.0

C2

147.185.221.23:57069

Mutex

lW9cEvIRnaJBDeUt

Attributes
  • Install_directory

    %LocalAppData%

  • install_file

    Realtek HD Audio Universal Service.exe

aes.plain

Signatures

  • Detect Xworm Payload 1 IoCs
  • Xworm

    Xworm is a remote access trojan written in C#.

  • Xworm family
  • Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Drops startup file 2 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Suspicious behavior: EnumeratesProcesses 9 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Realtek HD Audio Universal Service.exe
    "C:\Users\Admin\AppData\Local\Temp\Realtek HD Audio Universal Service.exe"
    1⤵
    • Checks computer location settings
    • Drops startup file
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:2864
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Realtek HD Audio Universal Service.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2840
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Realtek HD Audio Universal Service.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1616
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Realtek HD Audio Universal Service.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3284
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Realtek HD Audio Universal Service.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1056

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

    Filesize

    2KB

    MD5

    d85ba6ff808d9e5444a4b369f5bc2730

    SHA1

    31aa9d96590fff6981b315e0b391b575e4c0804a

    SHA256

    84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

    SHA512

    8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

    Filesize

    944B

    MD5

    2e907f77659a6601fcc408274894da2e

    SHA1

    9f5b72abef1cd7145bf37547cdb1b9254b4efe9d

    SHA256

    385da35673330e21ac02545220552fe301fe54dedefbdafc097ac4342a295233

    SHA512

    34fa0fff24f6550f55f828541aaefe5d75c86f8f0842d54b50065e9746f9662bb7209c74c9a9571540b9855bb3851f01db613190024e89b198d485bb5dc07721

  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

    Filesize

    944B

    MD5

    d2cfcaec8842041e069da07ebdf9ad1f

    SHA1

    000d391e61cafe523f535e3b206835bbfc96299b

    SHA256

    d9c1757a17a04213e3ea02d33192563cbbd1ac94e33228278dc3577c589a0fd3

    SHA512

    41b337225bd920fa14b0b7045b6050c60c97cb2e73937993bfcac780dfc40ec5cc80bc770f74ef9bef6cbc30df446355b6c63a5ce0918bcd21a382f32fc31546

  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

    Filesize

    944B

    MD5

    cc19bcff372d20459d3651ba8aef50e7

    SHA1

    3c6f1d4cdd647864fb97a16b1aefba67fcee11f7

    SHA256

    366473e774d8976c7fd4dc582220666fb61a4feb3f7c95e69b2a68ad9e446ec9

    SHA512

    a0e360ca4b6e874fd44612bf4b17f3722c0619da4f6bade12a62efadae88c2d33460114eaafa2bc3fb1cef5bea07e745b8bee24f15d0cacaff5f4a521b225080

  • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_f2vn4btn.f1r.ps1

    Filesize

    60B

    MD5

    d17fe0a3f47be24a6453e9ef58c94641

    SHA1

    6ab83620379fc69f80c0242105ddffd7d98d5d9d

    SHA256

    96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

    SHA512

    5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

  • memory/2840-19-0x00007FFBFD200000-0x00007FFBFDCC1000-memory.dmp

    Filesize

    10.8MB

  • memory/2840-14-0x0000021FBBDF0000-0x0000021FBBE12000-memory.dmp

    Filesize

    136KB

  • memory/2840-15-0x00007FFBFD200000-0x00007FFBFDCC1000-memory.dmp

    Filesize

    10.8MB

  • memory/2840-16-0x00007FFBFD200000-0x00007FFBFDCC1000-memory.dmp

    Filesize

    10.8MB

  • memory/2864-0-0x00007FFBFD203000-0x00007FFBFD205000-memory.dmp

    Filesize

    8KB

  • memory/2864-4-0x00007FFBFD200000-0x00007FFBFDCC1000-memory.dmp

    Filesize

    10.8MB

  • memory/2864-3-0x00007FFBFD203000-0x00007FFBFD205000-memory.dmp

    Filesize

    8KB

  • memory/2864-2-0x00007FFBFD200000-0x00007FFBFDCC1000-memory.dmp

    Filesize

    10.8MB

  • memory/2864-1-0x0000000000620000-0x0000000000630000-memory.dmp

    Filesize

    64KB