Analysis

  • max time kernel
    150s
  • max time network
    142s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22-04-2024 06:09

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:5020
    • 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:2932
    • 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:560
      • 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:3844
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:1940

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      Filesize

      3.1MB

      MD5

      41de983b173011ea0f81bc18257927ea

      SHA1

      48b40eadc6eca603b8adc15bc38a0b5b9450e56a

      SHA256

      1db7148b47d7219aa4587138b491a4b4bb41c7d95bfc0bdd152fdd6f1d774edb

      SHA512

      4efe78911125a02dea2a1e5112ae5869773b95862a104c9a97b4953a9a723898a56638f25cbb8508219896ffee9d5ae5d15d9dd1eb8790c2f28bfea1209a3525

    • memory/560-9-0x00007FFE1C5A0000-0x00007FFE1D061000-memory.dmp

      Filesize

      10.8MB

    • memory/560-11-0x0000000001010000-0x0000000001020000-memory.dmp

      Filesize

      64KB

    • memory/560-12-0x000000001B580000-0x000000001B5D0000-memory.dmp

      Filesize

      320KB

    • memory/560-13-0x000000001BCB0000-0x000000001BD62000-memory.dmp

      Filesize

      712KB

    • memory/560-14-0x00007FFE1C5A0000-0x00007FFE1D061000-memory.dmp

      Filesize

      10.8MB

    • memory/560-15-0x0000000001010000-0x0000000001020000-memory.dmp

      Filesize

      64KB

    • memory/5020-0-0x0000000000B60000-0x0000000000E84000-memory.dmp

      Filesize

      3.1MB

    • memory/5020-1-0x00007FFE1C5A0000-0x00007FFE1D061000-memory.dmp

      Filesize

      10.8MB

    • memory/5020-2-0x000000001BC30000-0x000000001BC40000-memory.dmp

      Filesize

      64KB

    • memory/5020-10-0x00007FFE1C5A0000-0x00007FFE1D061000-memory.dmp

      Filesize

      10.8MB