Analysis

  • max time kernel
    147s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    13-04-2024 19:15

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    61a794936ec8a32416ab054556f6270e

  • SHA1

    08f16c442752f65c04b8452642fd7b6102314fb0

  • SHA256

    796d5a37143cb32778bab8b2210e35c22d75bfaf2368323b0d2400ace4ded468

  • SHA512

    8000d3dfca0ef4daca77ad968af0c0ff496de9da59ffa5168479b0dcbd792ce5f1ea620cf0ff51d2bff1613383c3a3feeeccf1e07af963c199cb1d10e4d37988

  • SSDEEP

    49152:zv+lL26AaNeWgPhlmVqvMQ7XSKjDyr3MfNLoGd6ITTHHB72eh2NT:zvuL26AaNeWgPhlmVqkQ7XSKjDyrE

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

LunasLove-64385.portmap.host:64285

Mutex

29d7a2a1-3a57-4435-8407-1e32b7f510e7

Attributes
  • encryption_key

    717F000FA98487F20ACB7C82618D076F1B6DB848

  • 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 payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Creates scheduled task(s) 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\Client-built.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-built.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2404
    • 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⤵
      • Creates scheduled task(s)
      PID:3032
    • 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:4072
      • 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⤵
        • Creates scheduled task(s)
        PID:4532

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

    61a794936ec8a32416ab054556f6270e

    SHA1

    08f16c442752f65c04b8452642fd7b6102314fb0

    SHA256

    796d5a37143cb32778bab8b2210e35c22d75bfaf2368323b0d2400ace4ded468

    SHA512

    8000d3dfca0ef4daca77ad968af0c0ff496de9da59ffa5168479b0dcbd792ce5f1ea620cf0ff51d2bff1613383c3a3feeeccf1e07af963c199cb1d10e4d37988

  • memory/2404-0-0x00000000000B0000-0x00000000003D4000-memory.dmp

    Filesize

    3.1MB

  • memory/2404-1-0x00007FF8519B0000-0x00007FF852471000-memory.dmp

    Filesize

    10.8MB

  • memory/2404-2-0x000000001B120000-0x000000001B130000-memory.dmp

    Filesize

    64KB

  • memory/2404-9-0x00007FF8519B0000-0x00007FF852471000-memory.dmp

    Filesize

    10.8MB

  • memory/4072-10-0x00007FF8519B0000-0x00007FF852471000-memory.dmp

    Filesize

    10.8MB

  • memory/4072-11-0x000000001B910000-0x000000001B920000-memory.dmp

    Filesize

    64KB

  • memory/4072-12-0x000000001B8C0000-0x000000001B910000-memory.dmp

    Filesize

    320KB

  • memory/4072-13-0x000000001BFE0000-0x000000001C092000-memory.dmp

    Filesize

    712KB

  • memory/4072-14-0x00007FF8519B0000-0x00007FF852471000-memory.dmp

    Filesize

    10.8MB

  • memory/4072-15-0x000000001B910000-0x000000001B920000-memory.dmp

    Filesize

    64KB