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Analysis

  • max time kernel
    147s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    18/04/2024, 23:54

General

  • Target

    8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe

  • Size

    3.1MB

  • MD5

    c52e8cb313bd0e446cb9607636bbc6ec

  • SHA1

    77d3ca1584e486528e39802449027cd9e8b08b83

  • SHA256

    8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583

  • SHA512

    d8bdbad8a179c74f2479da58af5530782a1683e07ad656b91ee05b0b00daa8008d1e7143b34eae16ef6ef612e1f742832ae9b9167ac2286799075886d1a66a45

  • SSDEEP

    49152:KvWI22SsaNYfdPBldt698dBcjHS5RJ6PbR3LoGdBTHHB72eh2NT:Kv722SsaNYfdPBldt6+dBcjHS5RJ6h

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

victim

C2

192.168.56.1:4782

Mutex

f887c652-41ce-4f9e-8a72-52676eb54001

Attributes
  • encryption_key

    194B648FB0D06C59B36705385FF44BFC616F014E

  • 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 2 IoCs
  • Detects Windows executables referencing non-Windows User-Agents 2 IoCs
  • Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 2 IoCs
  • Detects executables containing common artifacts observed in infostealers 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Creates scheduled task(s) 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe
    "C:\Users\Admin\AppData\Local\Temp\8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583.exe"
    1⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:944
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:2128
    • C:\Windows\system32\SubDir\Client.exe
      "C:\Windows\system32\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:436
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:1868

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Windows\System32\SubDir\Client.exe

    Filesize

    3.1MB

    MD5

    c52e8cb313bd0e446cb9607636bbc6ec

    SHA1

    77d3ca1584e486528e39802449027cd9e8b08b83

    SHA256

    8168236516ecd464c7c004c1d824ace70932b9dd61c9e238256965c33f059583

    SHA512

    d8bdbad8a179c74f2479da58af5530782a1683e07ad656b91ee05b0b00daa8008d1e7143b34eae16ef6ef612e1f742832ae9b9167ac2286799075886d1a66a45

  • memory/436-9-0x00007FFC5BBE0000-0x00007FFC5C6A1000-memory.dmp

    Filesize

    10.8MB

  • memory/436-10-0x0000000001360000-0x0000000001370000-memory.dmp

    Filesize

    64KB

  • memory/436-11-0x0000000002D40000-0x0000000002D90000-memory.dmp

    Filesize

    320KB

  • memory/436-12-0x000000001C440000-0x000000001C4F2000-memory.dmp

    Filesize

    712KB

  • memory/436-13-0x00007FFC5BBE0000-0x00007FFC5C6A1000-memory.dmp

    Filesize

    10.8MB

  • memory/944-0-0x00000000003D0000-0x00000000006F4000-memory.dmp

    Filesize

    3.1MB

  • memory/944-1-0x00007FFC5BBE0000-0x00007FFC5C6A1000-memory.dmp

    Filesize

    10.8MB

  • memory/944-2-0x000000001B4A0000-0x000000001B4B0000-memory.dmp

    Filesize

    64KB

  • memory/944-8-0x00007FFC5BBE0000-0x00007FFC5C6A1000-memory.dmp

    Filesize

    10.8MB