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Analysis

  • max time kernel
    126s
  • max time network
    142s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06/01/2025, 18:39

General

  • Target

    MalwareBytes.exe

  • Size

    3.1MB

  • MD5

    1af2519e38937542ec6eca9bd1509026

  • SHA1

    00f3d3e74fa6fe2e2299add76db4211de41996fa

  • SHA256

    9431c0edb66c91b824e87f2576c0329056838518cccea37c58f2ccecd5a78cd0

  • SHA512

    46289dede2688c3dadbe89087b0deab8f2def92bb9c30345d68ffae2c4a70ec84c0bd3af7c6967db3757682440744d81cd254dec804908a5d674175600bb1d33

  • SSDEEP

    49152:7vyI22SsaNYfdPBldt698dBcjHOKRJ6abR3LoGd2THHB72eh2NT:7vf22SsaNYfdPBldt6+dBcjHOKRJ60

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.145:4782

Mutex

9d952f82-b8b7-4948-b2b7-53c225a63ebb

Attributes
  • encryption_key

    AAB9DCB0841C8C889A6BCA76764D0770416B2FE1

  • 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 family
  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Scheduled Task/Job: Scheduled Task 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\MalwareBytes.exe
    "C:\Users\Admin\AppData\Local\Temp\MalwareBytes.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2236
    • 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⤵
      • Scheduled Task/Job: Scheduled Task
      PID:4904
    • 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 SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4704
      • 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⤵
        • Scheduled Task/Job: Scheduled Task
        PID:2936

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    3.1MB

    MD5

    1af2519e38937542ec6eca9bd1509026

    SHA1

    00f3d3e74fa6fe2e2299add76db4211de41996fa

    SHA256

    9431c0edb66c91b824e87f2576c0329056838518cccea37c58f2ccecd5a78cd0

    SHA512

    46289dede2688c3dadbe89087b0deab8f2def92bb9c30345d68ffae2c4a70ec84c0bd3af7c6967db3757682440744d81cd254dec804908a5d674175600bb1d33

  • memory/2236-0-0x00007FFA4CE53000-0x00007FFA4CE55000-memory.dmp

    Filesize

    8KB

  • memory/2236-1-0x0000000000700000-0x0000000000A24000-memory.dmp

    Filesize

    3.1MB

  • memory/2236-2-0x00007FFA4CE50000-0x00007FFA4D911000-memory.dmp

    Filesize

    10.8MB

  • memory/2236-9-0x00007FFA4CE50000-0x00007FFA4D911000-memory.dmp

    Filesize

    10.8MB

  • memory/4704-10-0x00007FFA4CE50000-0x00007FFA4D911000-memory.dmp

    Filesize

    10.8MB

  • memory/4704-11-0x00007FFA4CE50000-0x00007FFA4D911000-memory.dmp

    Filesize

    10.8MB

  • memory/4704-12-0x000000001B020000-0x000000001B070000-memory.dmp

    Filesize

    320KB

  • memory/4704-13-0x000000001B9C0000-0x000000001BA72000-memory.dmp

    Filesize

    712KB

  • memory/4704-14-0x00007FFA4CE50000-0x00007FFA4D911000-memory.dmp

    Filesize

    10.8MB

  • memory/4704-15-0x000000001C0B0000-0x000000001C5D8000-memory.dmp

    Filesize

    5.2MB