Analysis

  • max time kernel
    149s
  • max time network
    147s
  • platform
    windows7_x64
  • resource
    win7-20240705-en
  • resource tags

    arch:x64arch:x86image:win7-20240705-enlocale:en-usos:windows7-x64system
  • submitted
    18/08/2024, 22:09

General

  • Target

    Client-built.exe

  • Size

    3.4MB

  • MD5

    58587e08cc617fb97526bfbac57b62e8

  • SHA1

    bd38f26aa6541b07a510d0a064b5c7235c9c8a5b

  • SHA256

    7a85eb78ce7c9487c6d2aa0ffcb569687accf73377cc1e6ce8123a15345cd7aa

  • SHA512

    b0ecdbe15b1fd4d2e190c285c14d1e454e9192105698f0d89952999a13b2b238128326eaf243e29c13c8d1c1e8372c7b6d735c92374921e2740fdd91d91da525

  • SSDEEP

    49152:k6LFXL5Z8hlPKxXava0n+g5I2j1THHB72eh2NT1Yq:k6p5Z8hlPKxXava0+KOY

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

RAN

C2

147.185.221.22:10340

Mutex

541c4371-7091-40eb-8fd1-2973b63dd560

Attributes
  • encryption_key

    45428D99D260D9C913112BDB878C52EA244CE0DB

  • install_name

    Windows Host Process.exe

  • log_directory

    Windows-Logs

  • reconnect_delay

    3000

  • startup_key

    Windows Host Process

  • subdirectory

    Windows

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 5 IoCs
  • 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 9 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⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1984
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:2860
    • C:\Windows\system32\Windows\Windows Host Process.exe
      "C:\Windows\system32\Windows\Windows Host Process.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1376
      • C:\Windows\system32\schtasks.exe
        "schtasks" /create /tn "Windows Host Process" /sc ONLOGON /tr "C:\Windows\system32\Windows\Windows Host Process.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:2512

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Windows\System32\Windows\Windows Host Process.exe

    Filesize

    3.4MB

    MD5

    58587e08cc617fb97526bfbac57b62e8

    SHA1

    bd38f26aa6541b07a510d0a064b5c7235c9c8a5b

    SHA256

    7a85eb78ce7c9487c6d2aa0ffcb569687accf73377cc1e6ce8123a15345cd7aa

    SHA512

    b0ecdbe15b1fd4d2e190c285c14d1e454e9192105698f0d89952999a13b2b238128326eaf243e29c13c8d1c1e8372c7b6d735c92374921e2740fdd91d91da525

  • memory/1376-11-0x000007FEF6540000-0x000007FEF6F2C000-memory.dmp

    Filesize

    9.9MB

  • memory/1376-10-0x000007FEF6540000-0x000007FEF6F2C000-memory.dmp

    Filesize

    9.9MB

  • memory/1376-9-0x00000000010D0000-0x0000000001436000-memory.dmp

    Filesize

    3.4MB

  • memory/1376-12-0x000007FEF6540000-0x000007FEF6F2C000-memory.dmp

    Filesize

    9.9MB

  • memory/1984-0-0x000007FEF6543000-0x000007FEF6544000-memory.dmp

    Filesize

    4KB

  • memory/1984-1-0x0000000001280000-0x00000000015E6000-memory.dmp

    Filesize

    3.4MB

  • memory/1984-2-0x000007FEF6540000-0x000007FEF6F2C000-memory.dmp

    Filesize

    9.9MB

  • memory/1984-8-0x000007FEF6540000-0x000007FEF6F2C000-memory.dmp

    Filesize

    9.9MB