Analysis

  • max time kernel
    148s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05-01-2025 15:02

General

  • Target

    Cleaner.exe

  • Size

    3.1MB

  • MD5

    f1f656fdd0c4224b3900a4c2d50443e6

  • SHA1

    9b2879d91a63e6437ec7b47a5c39dd5cc64c9df3

  • SHA256

    e278b36305e60e18a29c4b388248a78bd9c58fabc17fa9943392c43e7a49588e

  • SHA512

    2b8ea438b308c94d463f06c8a04da1fa292f448b6f024e59423a1df5f5693b4957d12ffef6d03679f2d4a0c93d93ba16d8acf5c74f694f3a1a5b91aae1d378cf

  • SSDEEP

    49152:GvyI22SsaNYfdPBldt698dBcjHlCy1JzLoGdZTHHB72eh2NT:Gvf22SsaNYfdPBldt6+dBcjHlCm

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\Cleaner.exe
    "C:\Users\Admin\AppData\Local\Temp\Cleaner.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1224
    • 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:2068
    • 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:4464
      • 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:4924

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

    f1f656fdd0c4224b3900a4c2d50443e6

    SHA1

    9b2879d91a63e6437ec7b47a5c39dd5cc64c9df3

    SHA256

    e278b36305e60e18a29c4b388248a78bd9c58fabc17fa9943392c43e7a49588e

    SHA512

    2b8ea438b308c94d463f06c8a04da1fa292f448b6f024e59423a1df5f5693b4957d12ffef6d03679f2d4a0c93d93ba16d8acf5c74f694f3a1a5b91aae1d378cf

  • memory/1224-0-0x00007FFDF1C13000-0x00007FFDF1C15000-memory.dmp

    Filesize

    8KB

  • memory/1224-1-0x0000000000920000-0x0000000000C44000-memory.dmp

    Filesize

    3.1MB

  • memory/1224-2-0x00007FFDF1C10000-0x00007FFDF26D1000-memory.dmp

    Filesize

    10.8MB

  • memory/1224-9-0x00007FFDF1C10000-0x00007FFDF26D1000-memory.dmp

    Filesize

    10.8MB

  • memory/4464-10-0x00007FFDF1C10000-0x00007FFDF26D1000-memory.dmp

    Filesize

    10.8MB

  • memory/4464-11-0x00007FFDF1C10000-0x00007FFDF26D1000-memory.dmp

    Filesize

    10.8MB

  • memory/4464-12-0x000000001BF20000-0x000000001BF70000-memory.dmp

    Filesize

    320KB

  • memory/4464-13-0x000000001C030000-0x000000001C0E2000-memory.dmp

    Filesize

    712KB

  • memory/4464-14-0x00007FFDF1C10000-0x00007FFDF26D1000-memory.dmp

    Filesize

    10.8MB