Analysis

  • max time kernel
    130s
  • max time network
    144s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    30/03/2024, 03:20

General

  • Target

    Client-abuilt.exe

  • Size

    3.3MB

  • MD5

    fe6bb1f615029c7e339444cbc41706bb

  • SHA1

    cabd13e4e04ef81687812f8680e55e048ee75bd7

  • SHA256

    b2ebc3a634719e1727dcae13f9a4f5df3d89b89718cfd0b2886a971a08b55e77

  • SHA512

    90b15572b73bb065f8cc38a2ca1dbe8ee73991c3693c49f96cda8652d89b010199f4f152b53ae5a7de1a3b13877d301f724ff454e9187950053f7735849e7e82

  • SSDEEP

    49152:3v+I22SsaNYfdPBldt698dBcjHQr0hrTavJSZoGdbTHHB72eh2NTDZqS:3vz22SsaNYfdPBldt6+dBcjHdTB

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office01

C2

198.7.62.204:4782

192.168.1.1:4782

Mutex

02b9c972-8b55-4d55-b7c4-09a1f00ff400

Attributes
  • encryption_key

    5BF0703F288C43118835CAF4D1A6879C29016FB3

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Client Startup

  • subdirectory

    SubDir

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
  • 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 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-abuilt.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-abuilt.exe"
    1⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2660
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:2960
    • C:\Windows\system32\SubDir\Client.exe
      "C:\Windows\system32\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2680
      • C:\Windows\system32\schtasks.exe
        "schtasks" /create /tn "Client Startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:2420

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Windows\System32\SubDir\Client.exe

    Filesize

    3.3MB

    MD5

    fe6bb1f615029c7e339444cbc41706bb

    SHA1

    cabd13e4e04ef81687812f8680e55e048ee75bd7

    SHA256

    b2ebc3a634719e1727dcae13f9a4f5df3d89b89718cfd0b2886a971a08b55e77

    SHA512

    90b15572b73bb065f8cc38a2ca1dbe8ee73991c3693c49f96cda8652d89b010199f4f152b53ae5a7de1a3b13877d301f724ff454e9187950053f7735849e7e82

  • memory/2660-0-0x0000000000360000-0x00000000006A8000-memory.dmp

    Filesize

    3.3MB

  • memory/2660-1-0x000007FEF5810000-0x000007FEF61FC000-memory.dmp

    Filesize

    9.9MB

  • memory/2660-2-0x000000001B2E0000-0x000000001B360000-memory.dmp

    Filesize

    512KB

  • memory/2660-11-0x000007FEF5810000-0x000007FEF61FC000-memory.dmp

    Filesize

    9.9MB

  • memory/2680-8-0x000007FEF5810000-0x000007FEF61FC000-memory.dmp

    Filesize

    9.9MB

  • memory/2680-9-0x0000000000CE0000-0x0000000001028000-memory.dmp

    Filesize

    3.3MB

  • memory/2680-10-0x000000001B4A0000-0x000000001B520000-memory.dmp

    Filesize

    512KB

  • memory/2680-12-0x000007FEF5810000-0x000007FEF61FC000-memory.dmp

    Filesize

    9.9MB

  • memory/2680-13-0x000000001B4A0000-0x000000001B520000-memory.dmp

    Filesize

    512KB