Analysis

  • max time kernel
    147s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    08-04-2024 22:28

General

  • Target

    745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe

  • Size

    3.1MB

  • MD5

    ed8542b4688d70d42d77fad98e5969b0

  • SHA1

    808666505eeca15e9a7a15b95ff439497a9f1dcf

  • SHA256

    745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002

  • SHA512

    72fc0930a4e51eb7a7b76bac97c64c9bb8e8fe30a406b294a824ecc721677c212d409368a6bca595b0ee82449d80cf7c09f4a063bbe7ee47ebcba30c5c3b6a45

  • SSDEEP

    49152:KvyI22SsaNYfdPBldt698dBcjH672lSt3oGdITHHB72eh2NT:Kvf22SsaNYfdPBldt6+dBcjH62lS9

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

10.127.0.54:4782

Mutex

76898c6c-aad7-493e-ad05-6bb072bc1ab9

Attributes
  • encryption_key

    E0AA33A7353AC58B6995079C718A83EE5609573D

  • install_name

    Twrek.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
  • Detects Windows executables referencing non-Windows User-Agents 2 IoCs
  • Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 2 IoCs
  • Detects executables containing common artifacts observed in infostealers 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\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe
    "C:\Users\Admin\AppData\Local\Temp\745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1008
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:1044
    • C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4264
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Twrek.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:2488

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    3.1MB

    MD5

    ed8542b4688d70d42d77fad98e5969b0

    SHA1

    808666505eeca15e9a7a15b95ff439497a9f1dcf

    SHA256

    745a69ac20dbb2482e7512bbc14950fa41bf78dbd0a5afda0396c8d897b50002

    SHA512

    72fc0930a4e51eb7a7b76bac97c64c9bb8e8fe30a406b294a824ecc721677c212d409368a6bca595b0ee82449d80cf7c09f4a063bbe7ee47ebcba30c5c3b6a45

  • memory/1008-0-0x00000000006C0000-0x00000000009E4000-memory.dmp

    Filesize

    3.1MB

  • memory/1008-1-0x00007FFDF91D0000-0x00007FFDF9C91000-memory.dmp

    Filesize

    10.8MB

  • memory/1008-2-0x0000000002AD0000-0x0000000002AE0000-memory.dmp

    Filesize

    64KB

  • memory/1008-13-0x00007FFDF91D0000-0x00007FFDF9C91000-memory.dmp

    Filesize

    10.8MB

  • memory/4264-9-0x00007FFDF91D0000-0x00007FFDF9C91000-memory.dmp

    Filesize

    10.8MB

  • memory/4264-10-0x000000001BB20000-0x000000001BB30000-memory.dmp

    Filesize

    64KB

  • memory/4264-11-0x000000001BA60000-0x000000001BAB0000-memory.dmp

    Filesize

    320KB

  • memory/4264-12-0x000000001C2E0000-0x000000001C392000-memory.dmp

    Filesize

    712KB

  • memory/4264-14-0x00007FFDF91D0000-0x00007FFDF9C91000-memory.dmp

    Filesize

    10.8MB

  • memory/4264-15-0x000000001BB20000-0x000000001BB30000-memory.dmp

    Filesize

    64KB