Analysis

  • max time kernel
    147s
  • max time network
    154s
  • 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 14:01

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    af13ce84d2a5ee2ab7854af2d6571ab1

  • SHA1

    bf082b48f3bd45f8e6c55a7e897f5171181fad61

  • SHA256

    30369ff4ed77a2cf2fd35a32c876a222cca094e7db7344051dc881e982908e95

  • SHA512

    e501e34e108a99a8a82560b20baccdd3746f5713a0fbaa37a209ff1daacf6637022c5bfd35ff25efdc9adbf7ddf72e7882cf300d076f1ab0886174437e801d56

  • SSDEEP

    49152:HvnI22SsaNYfdPBldt698dBcjHoRxNESEQk/inLoGdTTHHB72eh2NT:HvI22SsaNYfdPBldt6+dBcjH2xjL

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.254.152:4782

Mutex

37c3d2aa-6a36-4ee8-a4be-f1c3187fbd03

Attributes
  • encryption_key

    E9EE5B51F341491A9CE8837BE89BB18191B86C1E

  • 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
  • Executes dropped EXE 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4436
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      PID:4352

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe

    Filesize

    3.1MB

    MD5

    af13ce84d2a5ee2ab7854af2d6571ab1

    SHA1

    bf082b48f3bd45f8e6c55a7e897f5171181fad61

    SHA256

    30369ff4ed77a2cf2fd35a32c876a222cca094e7db7344051dc881e982908e95

    SHA512

    e501e34e108a99a8a82560b20baccdd3746f5713a0fbaa37a209ff1daacf6637022c5bfd35ff25efdc9adbf7ddf72e7882cf300d076f1ab0886174437e801d56

  • memory/4352-10-0x000000001B990000-0x000000001B9A0000-memory.dmp

    Filesize

    64KB

  • memory/4352-8-0x00007FFF3D1B0000-0x00007FFF3DC71000-memory.dmp

    Filesize

    10.8MB

  • memory/4352-11-0x000000001C3D0000-0x000000001C420000-memory.dmp

    Filesize

    320KB

  • memory/4352-12-0x000000001C4E0000-0x000000001C592000-memory.dmp

    Filesize

    712KB

  • memory/4352-13-0x00007FFF3D1B0000-0x00007FFF3DC71000-memory.dmp

    Filesize

    10.8MB

  • memory/4352-14-0x000000001B990000-0x000000001B9A0000-memory.dmp

    Filesize

    64KB

  • memory/4436-0-0x0000000000700000-0x0000000000A24000-memory.dmp

    Filesize

    3.1MB

  • memory/4436-1-0x00007FFF3D1B0000-0x00007FFF3DC71000-memory.dmp

    Filesize

    10.8MB

  • memory/4436-2-0x000000001B780000-0x000000001B790000-memory.dmp

    Filesize

    64KB

  • memory/4436-9-0x00007FFF3D1B0000-0x00007FFF3DC71000-memory.dmp

    Filesize

    10.8MB