Overview

overview

10

Static

static

10

Client-built.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    894s
  • max time network
    441s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04-02-2025 21:36

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General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    b1b23e7564eb88d5e6901c9756463227

  • SHA1

    e3bc8a7be02bc91358abe1a1b3351b2c7c0a466c

  • SHA256

    984fb190e5d6fbc14972ad1eac799098a0e92fdc9c3caf668fb83a5a2e90f708

  • SHA512

    293d73265ad8569d28adcb47e2b5f90b5baa6cde4411825258a5c656abbb7fc831b7b9f753e688511289691137a527590d45204a4e7ecca5595006f920c5f95e

  • SSDEEP

    49152:OvFt62XlaSFNWPjljiFa2RoUYIVuz6Bx3GoGdKTHHB72eh2NT:Ov362XlaSFNWPjljiFXRoUYIMzv

Score
10/10
quasaroffice04spywaretrojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

127.0.0.1:4782

Mutex

ec402812-c0b3-4314-80f7-4ab5e6935689

Attributes
  • encryption_key

    D9C0FD8481035A2F5997C8D6003A1CC132B124F7

  • 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.

    trojanspywarequasar
  • Quasar family
    quasar
  • Quasar payload 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

    persistenceexecution
  • Suspicious use of AdjustPrivilegeToken 1 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
  • 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.

    persistence

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 FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:324
    • 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:2016

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • memory/324-0-0x00007FFFF8853000-0x00007FFFF8855000-memory.dmp

    Filesize

    8KB

    Download

  • memory/324-1-0x0000000000F30000-0x0000000001254000-memory.dmp

    Filesize

    3.1MB

    Download

  • memory/324-2-0x00007FFFF8850000-0x00007FFFF9311000-memory.dmp

    Filesize

    10.8MB

    Download

  • memory/324-3-0x000000001CB50000-0x000000001CBA0000-memory.dmp

    Filesize

    320KB

    Download

  • memory/324-4-0x000000001CC60000-0x000000001CD12000-memory.dmp

    Filesize

    712KB

    Download

  • memory/324-5-0x00007FFFF8853000-0x00007FFFF8855000-memory.dmp

    Filesize

    8KB

    Download

  • memory/324-6-0x00007FFFF8850000-0x00007FFFF9311000-memory.dmp

    Filesize

    10.8MB

    Download