Analysis

  • max time kernel
    14s
  • max time network
    18s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    10-04-2024 11:07

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    3f8eed5b849f82d1d648309d4dff4259

  • SHA1

    84afa96423792de3ec490807adf9ed91f3dbe941

  • SHA256

    eaa750c492fa799eb0b19e7d13a265c5091593d8b6c90a7c50b50c8c84469dad

  • SHA512

    ec4e36ec67e6fc355bfec6d5d197c8a35e9d0a3ca2dd412ce90687a42e3776cd8cf910da3d7af1834b808fc76d3569ad81e63e3f1d5d469966db7d318b572ba9

  • SSDEEP

    49152:CvvY52fyaSZOrPWluWBuGG5g5hAfDobRcLoGd3FWTHHB72eh2NT:CvA52fyaSZOrPWluWBDG5g5hAfDL

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

Quasar:4782

Mutex

9b67176b-b611-43bb-9088-e3361aae729e

Attributes
  • encryption_key

    8E11C43A418F21B478F3A8A93EDFD963316D550B

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    File Explorer

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 1 IoCs
  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 3 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⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3052
    • C:\Windows\system32\schtasks.exe
      "schtasks" /create /tn "File Explorer" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:2440

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • memory/3052-0-0x0000000001080000-0x00000000013A4000-memory.dmp

    Filesize

    3.1MB

  • memory/3052-1-0x000007FEF5330000-0x000007FEF5D1C000-memory.dmp

    Filesize

    9.9MB

  • memory/3052-2-0x0000000000C60000-0x0000000000CE0000-memory.dmp

    Filesize

    512KB