Analysis

  • max time kernel
    150s
  • max time network
    155s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-fr
  • resource tags

    arch:x64arch:x86image:win11-20240802-frlocale:fr-fros:windows11-21h2-x64systemwindows
  • submitted
    18/08/2024, 22:00

General

  • Target

    Client-built.exe

  • Size

    3.3MB

  • MD5

    7ab6f43a992374ea2bc02b6870f92726

  • SHA1

    52277ea3799bc72c661a82d079184898239301db

  • SHA256

    659f42a823f37790b2cbdbfc19d0755a3471bfcb0097cdf48e2f891df62f4819

  • SHA512

    e9e98280a618966b3585c684d113ceee90a57e46ce02c64ab64c2a242f51e024c3c5f4f0313587afb9baf02960f6d6ebd939726dbab26680a4d8a6fcfc420a5e

  • SSDEEP

    49152:yei8dGFjxJFp/DGoye3Z4LVu0jvqCtQI2VEeTHHB72eh2NTf:yeCFjxJTbGor3Z4LVu0fKw/

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

SKIDS

C2

147.185.221.22:6712

Mutex

1051d457-43fe-4be3-87a0-52f2e36a87aa

Attributes
  • encryption_key

    F387A0FF28E4F7F4D7B4E353EB2E71F75D3FB5C0

  • 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 2 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 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⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4028
    • 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:1544
    • 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 SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4720
      • 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:1860

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    3.3MB

    MD5

    7ab6f43a992374ea2bc02b6870f92726

    SHA1

    52277ea3799bc72c661a82d079184898239301db

    SHA256

    659f42a823f37790b2cbdbfc19d0755a3471bfcb0097cdf48e2f891df62f4819

    SHA512

    e9e98280a618966b3585c684d113ceee90a57e46ce02c64ab64c2a242f51e024c3c5f4f0313587afb9baf02960f6d6ebd939726dbab26680a4d8a6fcfc420a5e

  • memory/4028-0-0x00007FFF5CCA0000-0x00007FFF5CDB2000-memory.dmp

    Filesize

    1.1MB

  • memory/4028-1-0x00000000008E0000-0x0000000000C36000-memory.dmp

    Filesize

    3.3MB

  • memory/4028-8-0x00007FFF5CCA0000-0x00007FFF5CDB2000-memory.dmp

    Filesize

    1.1MB

  • memory/4720-9-0x00007FFF5CCA0000-0x00007FFF5CDB2000-memory.dmp

    Filesize

    1.1MB

  • memory/4720-10-0x000000001B250000-0x000000001B2A0000-memory.dmp

    Filesize

    320KB

  • memory/4720-11-0x000000001BEA0000-0x000000001BF52000-memory.dmp

    Filesize

    712KB

  • memory/4720-12-0x00007FFF5CCA0000-0x00007FFF5CDB2000-memory.dmp

    Filesize

    1.1MB