Analysis

  • max time kernel
    149s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240709-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28-07-2024 19:07

General

  • Target

    Loader.exe

  • Size

    3.1MB

  • MD5

    6c0cfc9686b74302e726ddcc3252740e

  • SHA1

    a588ad7e2398448a1587576b1f90c9c59bcd78fc

  • SHA256

    342c074263edefc48959a9c15cb1cc05046c53a1607728eb6679f9c8303680a0

  • SHA512

    1e9ae56b2ee6bef507cfd3137616b1ea0ffb98c4e0bd5fdf429fb77d5c6ee475ee9d22edacdc883dd7e0bd2b2b6c0e13c43a55f8cf3c84b229a98f42fa1acc02

  • SSDEEP

    49152:PvyI22SsaNYfdPBldt698dBcjHE/Ta95fQ7k/tLoGdQTHHB72eh2NT:Pvf22SsaNYfdPBldt6+dBcjHMa1

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.51:4782

Mutex

f27e08a6-ff49-4d45-95d3-6cd8cee7819a

Attributes
  • encryption_key

    9E15BDE09B20CFD0A6A2957840462A93B6C4BFD6

  • install_name

    Client.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 payload 2 IoCs
  • Executes dropped EXE 1 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\Loader.exe
    "C:\Users\Admin\AppData\Local\Temp\Loader.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2948
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:208
    • C:\Users\Admin\AppData\Roaming\SubDir\Client.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4716
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:1596

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    3.1MB

    MD5

    6c0cfc9686b74302e726ddcc3252740e

    SHA1

    a588ad7e2398448a1587576b1f90c9c59bcd78fc

    SHA256

    342c074263edefc48959a9c15cb1cc05046c53a1607728eb6679f9c8303680a0

    SHA512

    1e9ae56b2ee6bef507cfd3137616b1ea0ffb98c4e0bd5fdf429fb77d5c6ee475ee9d22edacdc883dd7e0bd2b2b6c0e13c43a55f8cf3c84b229a98f42fa1acc02

  • memory/2948-0-0x00007FFC7FD73000-0x00007FFC7FD75000-memory.dmp

    Filesize

    8KB

  • memory/2948-1-0x0000000000440000-0x0000000000764000-memory.dmp

    Filesize

    3.1MB

  • memory/2948-2-0x00007FFC7FD70000-0x00007FFC80831000-memory.dmp

    Filesize

    10.8MB

  • memory/2948-9-0x00007FFC7FD70000-0x00007FFC80831000-memory.dmp

    Filesize

    10.8MB

  • memory/4716-10-0x00007FFC7FD70000-0x00007FFC80831000-memory.dmp

    Filesize

    10.8MB

  • memory/4716-11-0x00007FFC7FD70000-0x00007FFC80831000-memory.dmp

    Filesize

    10.8MB

  • memory/4716-12-0x000000001B700000-0x000000001B750000-memory.dmp

    Filesize

    320KB

  • memory/4716-13-0x000000001C090000-0x000000001C142000-memory.dmp

    Filesize

    712KB

  • memory/4716-14-0x00007FFC7FD70000-0x00007FFC80831000-memory.dmp

    Filesize

    10.8MB

  • memory/4716-15-0x00007FFC7FD70000-0x00007FFC80831000-memory.dmp

    Filesize

    10.8MB