Analysis

  • max time kernel
    27s
  • max time network
    20s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240412-en
  • resource tags

    arch:x64arch:x86image:win11-20240412-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    19-04-2024 22:35

General

  • Target

    Client-builttttt.exe

  • Size

    3.1MB

  • MD5

    6008b1f40ce25519bacd9a12f89755df

  • SHA1

    e38e22911d1baebae439caf4d5556143927e3a02

  • SHA256

    33ec7881247e8bd2bb40bb8c3f54b8e18d6c4f562513e976170de401230a50f7

  • SHA512

    133aea39eb9617aa968c33add336304a1b1796ba1945db7ad7b6748d3463e77dbb405ff3755f4dc1f6d3de37eec870d9b01c3dcbaa0ff399f02e86174ec5a2ce

  • SSDEEP

    49152:Sv/I22SsaNYfdPBldt698dBcjHghGmvBToGduNTHHB72eh2NT:SvQ22SsaNYfdPBldt6+dBcjHghGmv5e

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.139:4782

127.0.0.1:4782

Mutex

e12e9d8f-f86f-4c20-aaa9-ca4ae3df9435

Attributes
  • encryption_key

    8A5C503C69142D8C1F9A30FB7AA52FB2729B3861

  • 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 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 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 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-builttttt.exe
    "C:\Users\Admin\AppData\Local\Temp\Client-builttttt.exe"
    1⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1440
    • 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:5012
    • C:\Windows\system32\SubDir\Client.exe
      "C:\Windows\system32\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4960
      • 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:1604

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    3.1MB

    MD5

    6008b1f40ce25519bacd9a12f89755df

    SHA1

    e38e22911d1baebae439caf4d5556143927e3a02

    SHA256

    33ec7881247e8bd2bb40bb8c3f54b8e18d6c4f562513e976170de401230a50f7

    SHA512

    133aea39eb9617aa968c33add336304a1b1796ba1945db7ad7b6748d3463e77dbb405ff3755f4dc1f6d3de37eec870d9b01c3dcbaa0ff399f02e86174ec5a2ce

  • memory/1440-0-0x0000000000060000-0x0000000000384000-memory.dmp

    Filesize

    3.1MB

  • memory/1440-1-0x00007FFE54DB0000-0x00007FFE55872000-memory.dmp

    Filesize

    10.8MB

  • memory/1440-2-0x000000001B110000-0x000000001B120000-memory.dmp

    Filesize

    64KB

  • memory/1440-9-0x00007FFE54DB0000-0x00007FFE55872000-memory.dmp

    Filesize

    10.8MB

  • memory/4960-8-0x00007FFE54DB0000-0x00007FFE55872000-memory.dmp

    Filesize

    10.8MB

  • memory/4960-10-0x000000001BBB0000-0x000000001BBC0000-memory.dmp

    Filesize

    64KB

  • memory/4960-11-0x000000001C740000-0x000000001C790000-memory.dmp

    Filesize

    320KB

  • memory/4960-12-0x000000001C850000-0x000000001C902000-memory.dmp

    Filesize

    712KB

  • memory/4960-13-0x00007FFE54DB0000-0x00007FFE55872000-memory.dmp

    Filesize

    10.8MB

  • memory/4960-14-0x000000001BBB0000-0x000000001BBC0000-memory.dmp

    Filesize

    64KB