Analysis

  • max time kernel
    146s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07-04-2024 17:38

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    3169d3f34b2ce9d94a1bcb0e9ae48600

  • SHA1

    ffec6c71b6c2213be5c4745807de1aedd6a90f20

  • SHA256

    e30519495fc30aca7d914b0628fb21dd89f482856a9bbc70c62d2dbcf18d11b7

  • SHA512

    468f5db3cdf3a7a2870a6f78956f80b494520c2d8a589895794f4a5d7c7ea9feb262b7f5466933e8995eb2ddd8e92b72d7fe61f9afa4d89681e24840fc729860

  • SSDEEP

    49152:WvbI22SsaNYfdPBldt698dBcjHp7qx57Gek/DBoGifUaTHHB72eh2NT:Wvk22SsaNYfdPBldt6+dBcjHxqE

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

x.tcp.ngrok.io:16096

Mutex

755f883f-4d58-4349-bc9e-f21c4e163b6f

Attributes
  • encryption_key

    EE65D8F2E429F4900E3A17963595716D863A2455

  • 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
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • 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 FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 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:4168
    • 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:3576
    • 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 SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4356
      • 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:3956

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

    3169d3f34b2ce9d94a1bcb0e9ae48600

    SHA1

    ffec6c71b6c2213be5c4745807de1aedd6a90f20

    SHA256

    e30519495fc30aca7d914b0628fb21dd89f482856a9bbc70c62d2dbcf18d11b7

    SHA512

    468f5db3cdf3a7a2870a6f78956f80b494520c2d8a589895794f4a5d7c7ea9feb262b7f5466933e8995eb2ddd8e92b72d7fe61f9afa4d89681e24840fc729860

  • memory/4168-0-0x0000000000390000-0x00000000006B4000-memory.dmp

    Filesize

    3.1MB

  • memory/4168-1-0x00007FFF27130000-0x00007FFF27BF1000-memory.dmp

    Filesize

    10.8MB

  • memory/4168-2-0x0000000002740000-0x0000000002750000-memory.dmp

    Filesize

    64KB

  • memory/4168-9-0x00007FFF27130000-0x00007FFF27BF1000-memory.dmp

    Filesize

    10.8MB

  • memory/4356-8-0x00007FFF27130000-0x00007FFF27BF1000-memory.dmp

    Filesize

    10.8MB

  • memory/4356-10-0x00000000030F0000-0x0000000003100000-memory.dmp

    Filesize

    64KB

  • memory/4356-11-0x000000001C920000-0x000000001C970000-memory.dmp

    Filesize

    320KB

  • memory/4356-12-0x000000001CA30000-0x000000001CAE2000-memory.dmp

    Filesize

    712KB

  • memory/4356-13-0x00007FFF27130000-0x00007FFF27BF1000-memory.dmp

    Filesize

    10.8MB

  • memory/4356-14-0x00000000030F0000-0x0000000003100000-memory.dmp

    Filesize

    64KB