Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-12-2024 06:42

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    be5735282826036dcacc522c081365a0

  • SHA1

    310bba5786ba8a4087cb8045ea699279a434a818

  • SHA256

    78fe9f9cac3e4d5cf653be4475c8f247d4803379365dd44320716ea7384a8c11

  • SHA512

    0fecccb5dd1ecfc0eba3dc89e078b2210ea6299d0f60cdd7bade885872cd07f6bbf041b98924054b71d35d94e56e3004ac825c5f2f9feb7f18758fad25c3b2f3

  • SSDEEP

    49152:eviI22SsaNYfdPBldt698dBcjHq1SQoGv5lpTHHB72eh2NT:evv22SsaNYfdPBldt6+dBcjHq19x

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

193.161.193.99:43242

Mutex

45bfb701-bea2-411a-948d-9a6abe001f83

Attributes
  • encryption_key

    80594967BC0A4839C316A44D62DE36E9BF18177F

  • install_name

    SYSTEM26.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 family
  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Scheduled Task/Job: Scheduled Task 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:1504
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\SYSTEM26.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:3808
    • C:\Users\Admin\AppData\Roaming\SubDir\SYSTEM26.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\SYSTEM26.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:2056
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\SYSTEM26.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:4832

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Roaming\SubDir\SYSTEM26.exe

    Filesize

    3.1MB

    MD5

    be5735282826036dcacc522c081365a0

    SHA1

    310bba5786ba8a4087cb8045ea699279a434a818

    SHA256

    78fe9f9cac3e4d5cf653be4475c8f247d4803379365dd44320716ea7384a8c11

    SHA512

    0fecccb5dd1ecfc0eba3dc89e078b2210ea6299d0f60cdd7bade885872cd07f6bbf041b98924054b71d35d94e56e3004ac825c5f2f9feb7f18758fad25c3b2f3

  • memory/1504-0-0x00007FFD352C3000-0x00007FFD352C5000-memory.dmp

    Filesize

    8KB

  • memory/1504-1-0x0000000000030000-0x0000000000354000-memory.dmp

    Filesize

    3.1MB

  • memory/1504-2-0x00007FFD352C0000-0x00007FFD35D81000-memory.dmp

    Filesize

    10.8MB

  • memory/1504-10-0x00007FFD352C0000-0x00007FFD35D81000-memory.dmp

    Filesize

    10.8MB

  • memory/2056-9-0x00007FFD352C0000-0x00007FFD35D81000-memory.dmp

    Filesize

    10.8MB

  • memory/2056-11-0x00007FFD352C0000-0x00007FFD35D81000-memory.dmp

    Filesize

    10.8MB

  • memory/2056-13-0x000000001C7F0000-0x000000001C8A2000-memory.dmp

    Filesize

    712KB

  • memory/2056-12-0x000000001C6E0000-0x000000001C730000-memory.dmp

    Filesize

    320KB

  • memory/2056-14-0x00007FFD352C0000-0x00007FFD35D81000-memory.dmp

    Filesize

    10.8MB