Overview

overview

10

Static

static

10

Client-built.exe

windows7-x64

10

Client-built.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    148s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11/01/2025, 22:19

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General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    7d9c6de47c31429b7cf08f07627add9f

  • SHA1

    956c88efb80cd32f927bb9b5b25cfc9003b3dffa

  • SHA256

    eaa4c2ef6a75906268f1ab8747ac150393f6487b0f6f57572536925481e00a73

  • SHA512

    6ed87cde8eef630d9262817a6cab8c8af5163a12cef18dc21a5717386861c611f9e393a7993750dda128284bf1d1ffc1b4748a6e1f1d3569d4fbea877e23e12e

  • SSDEEP

    49152:uviI22SsaNYfdPBldt698dBcjH4Ge2EGHBk/uV+oGdJTTHHB72eh2NT:uvv22SsaNYfdPBldt6+dBcjH4GewI

Score
10/10
quasaroffice04spywaretrojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

193.161.193.99:1194

Mutex

971d5aa2-233d-46c4-98c1-1812990742ad

Attributes
  • encryption_key

    151D6A9E126EFB6E3B926F9127D87D6BF4A4C605

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    SecurityHealthSystray.exe

  • 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 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 WriteProcessMemory
    PID:1240
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "SecurityHealthSystray.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:860

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • memory/1240-0-0x00007FFF8B113000-0x00007FFF8B115000-memory.dmp

    Filesize

    8KB

    Download

  • memory/1240-1-0x0000000000E80000-0x00000000011A4000-memory.dmp

    Filesize

    3.1MB

    Download

  • memory/1240-2-0x00007FFF8B110000-0x00007FFF8BBD1000-memory.dmp

    Filesize

    10.8MB

    Download

  • memory/1240-3-0x000000001E210000-0x000000001E260000-memory.dmp

    Filesize

    320KB

    Download

  • memory/1240-4-0x000000001E320000-0x000000001E3D2000-memory.dmp

    Filesize

    712KB

    Download

  • memory/1240-5-0x00007FFF8B113000-0x00007FFF8B115000-memory.dmp

    Filesize

    8KB

    Download

  • memory/1240-6-0x00007FFF8B110000-0x00007FFF8BBD1000-memory.dmp

    Filesize

    10.8MB

    Download