Analysis

  • max time kernel
    1034s
  • max time network
    1050s
  • platform
    windows10-ltsc 2021_x64
  • resource
    win10ltsc2021-20241023-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20241023-enlocale:en-usos:windows10-ltsc 2021-x64system
  • submitted
    05-11-2024 04:29

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    fef7fc18a56919307292dad1b0481e8e

  • SHA1

    1b4cc3b74a2c5c43cad76cf12f7b03dafe6dad3a

  • SHA256

    d2422e4e839fa1da5bdb80a4762ba07c26c6134eb9f00e691894ec5312024c83

  • SHA512

    6fd9b368c64364b28e35a972fe5dc25f3afc3ce13ab4bb8764c9a80018bf97b1c6e13b2026750dc5dc08909a3f7054b85c5d23ef59217489f1d7807e3132e568

  • SSDEEP

    49152:Gv3I22SsaNYfdPBldt698dBcjHPsRJ6ObR3LoGdbrTHHB72eh2NT:Gv422SsaNYfdPBldt6+dBcjHPsRJ6Ir

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

10.127.1.127:4782

Mutex

27b4bceb-071c-49a0-8bca-3a989c114a17

Attributes
  • encryption_key

    EAEDFD6C6C0EA0BF7F7A63603931D231453DE1D6

  • 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
  • Enumerates physical storage devices 1 TTPs

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

  • 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 FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 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:764
    • 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:3688
    • 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 WriteProcessMemory
      PID:924
      • 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:1460

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

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

    Filesize

    3.1MB

    MD5

    fef7fc18a56919307292dad1b0481e8e

    SHA1

    1b4cc3b74a2c5c43cad76cf12f7b03dafe6dad3a

    SHA256

    d2422e4e839fa1da5bdb80a4762ba07c26c6134eb9f00e691894ec5312024c83

    SHA512

    6fd9b368c64364b28e35a972fe5dc25f3afc3ce13ab4bb8764c9a80018bf97b1c6e13b2026750dc5dc08909a3f7054b85c5d23ef59217489f1d7807e3132e568

  • memory/764-0-0x00007FFB80023000-0x00007FFB80025000-memory.dmp

    Filesize

    8KB

  • memory/764-1-0x00000000002F0000-0x0000000000614000-memory.dmp

    Filesize

    3.1MB

  • memory/764-2-0x00007FFB80020000-0x00007FFB80AE2000-memory.dmp

    Filesize

    10.8MB

  • memory/764-5-0x00007FFB80020000-0x00007FFB80AE2000-memory.dmp

    Filesize

    10.8MB

  • memory/924-6-0x00007FFB80020000-0x00007FFB80AE2000-memory.dmp

    Filesize

    10.8MB

  • memory/924-7-0x00007FFB80020000-0x00007FFB80AE2000-memory.dmp

    Filesize

    10.8MB

  • memory/924-8-0x000000001C440000-0x000000001C490000-memory.dmp

    Filesize

    320KB

  • memory/924-9-0x000000001C550000-0x000000001C602000-memory.dmp

    Filesize

    712KB

  • memory/924-10-0x00007FFB80020000-0x00007FFB80AE2000-memory.dmp

    Filesize

    10.8MB