Analysis

  • max time kernel
    149s
  • max time network
    135s
  • platform
    windows10-1703_x64
  • resource
    win10-20240404-en
  • resource tags

    arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
  • submitted
    22-04-2024 06:06

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    41de983b173011ea0f81bc18257927ea

  • SHA1

    48b40eadc6eca603b8adc15bc38a0b5b9450e56a

  • SHA256

    1db7148b47d7219aa4587138b491a4b4bb41c7d95bfc0bdd152fdd6f1d774edb

  • SHA512

    4efe78911125a02dea2a1e5112ae5869773b95862a104c9a97b4953a9a723898a56638f25cbb8508219896ffee9d5ae5d15d9dd1eb8790c2f28bfea1209a3525

  • SSDEEP

    49152:yvyI22SsaNYfdPBldt698dBcjHBK8wDMfVEoGdATHHB72eh2NT:yvf22SsaNYfdPBldt6+dBcjHBK8wT

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.40.129:4782

Mutex

19c3bb2c-1a75-4589-b738-25f9f15ec087

Attributes
  • encryption_key

    9BD7B5AD8335EC9A1AB45A1EB5FC9CA0CBA10236

  • 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:3508
    • 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:3640
    • 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:4832
      • 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:204

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

    41de983b173011ea0f81bc18257927ea

    SHA1

    48b40eadc6eca603b8adc15bc38a0b5b9450e56a

    SHA256

    1db7148b47d7219aa4587138b491a4b4bb41c7d95bfc0bdd152fdd6f1d774edb

    SHA512

    4efe78911125a02dea2a1e5112ae5869773b95862a104c9a97b4953a9a723898a56638f25cbb8508219896ffee9d5ae5d15d9dd1eb8790c2f28bfea1209a3525

  • memory/3508-0-0x0000000000EB0000-0x00000000011D4000-memory.dmp

    Filesize

    3.1MB

  • memory/3508-1-0x00007FFAEF890000-0x00007FFAF027C000-memory.dmp

    Filesize

    9.9MB

  • memory/3508-2-0x000000001BF00000-0x000000001BF10000-memory.dmp

    Filesize

    64KB

  • memory/3508-10-0x00007FFAEF890000-0x00007FFAF027C000-memory.dmp

    Filesize

    9.9MB

  • memory/4832-9-0x00007FFAEF890000-0x00007FFAF027C000-memory.dmp

    Filesize

    9.9MB

  • memory/4832-11-0x000000001B1E0000-0x000000001B1F0000-memory.dmp

    Filesize

    64KB

  • memory/4832-12-0x000000001B960000-0x000000001B9B0000-memory.dmp

    Filesize

    320KB

  • memory/4832-13-0x000000001BA70000-0x000000001BB22000-memory.dmp

    Filesize

    712KB

  • memory/4832-14-0x00007FFAEF890000-0x00007FFAF027C000-memory.dmp

    Filesize

    9.9MB

  • memory/4832-15-0x000000001B1E0000-0x000000001B1F0000-memory.dmp

    Filesize

    64KB