Analysis

  • max time kernel
    92s
  • max time network
    142s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07-04-2024 17:44

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    293e5793dea329af168463e35950c84a

  • SHA1

    790fb958938ab09415b8c61deb0d164a24dad596

  • SHA256

    eddbc56dadb4921c99e30d4637b61238b6b2188b5db86f47bc720cbbb5b15bc7

  • SHA512

    0b5cd07cb0f8aa1a74a864c737d4447c0bd370cbbfe07d3014c2ec7a355bae5df84674238d105396a30dc37c0c0606870d0dc4f69f1068c849ceb72cae0c39a7

  • SSDEEP

    49152:rvbI22SsaNYfdPBldt698dBcjHZNp+oGdDkTHHB72eh2NT:rvk22SsaNYfdPBldt6+dBcjHZNU

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

2.tcp.eu.ngrok.io:16096

Mutex

755f883f-4d58-4349-bc9e-f21c4e163b6f

Attributes
  • encryption_key

    EE65D8F2E429F4900E3A17963595716D863A2455

  • 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
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • 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 FindShellTrayWindow 3 IoCs
  • Suspicious use of SendNotifyMessage 3 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\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3388
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:2176
    • 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
      • Suspicious use of WriteProcessMemory
      PID:1916
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:3924

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

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

    Filesize

    3.1MB

    MD5

    293e5793dea329af168463e35950c84a

    SHA1

    790fb958938ab09415b8c61deb0d164a24dad596

    SHA256

    eddbc56dadb4921c99e30d4637b61238b6b2188b5db86f47bc720cbbb5b15bc7

    SHA512

    0b5cd07cb0f8aa1a74a864c737d4447c0bd370cbbfe07d3014c2ec7a355bae5df84674238d105396a30dc37c0c0606870d0dc4f69f1068c849ceb72cae0c39a7

  • memory/1916-9-0x00007FFD6A3A0000-0x00007FFD6AE61000-memory.dmp

    Filesize

    10.8MB

  • memory/1916-10-0x000000001B540000-0x000000001B550000-memory.dmp

    Filesize

    64KB

  • memory/1916-11-0x000000001C120000-0x000000001C170000-memory.dmp

    Filesize

    320KB

  • memory/1916-12-0x000000001C230000-0x000000001C2E2000-memory.dmp

    Filesize

    712KB

  • memory/1916-16-0x000000001CD30000-0x000000001CD6C000-memory.dmp

    Filesize

    240KB

  • memory/1916-15-0x000000001C1B0000-0x000000001C1C2000-memory.dmp

    Filesize

    72KB

  • memory/1916-17-0x00007FFD6A3A0000-0x00007FFD6AE61000-memory.dmp

    Filesize

    10.8MB

  • memory/3388-0-0x0000000000CA0000-0x0000000000FC4000-memory.dmp

    Filesize

    3.1MB

  • memory/3388-1-0x00007FFD6A3A0000-0x00007FFD6AE61000-memory.dmp

    Filesize

    10.8MB

  • memory/3388-2-0x000000001BDA0000-0x000000001BDB0000-memory.dmp

    Filesize

    64KB

  • memory/3388-8-0x00007FFD6A3A0000-0x00007FFD6AE61000-memory.dmp

    Filesize

    10.8MB