Analysis

  • max time kernel
    101s
  • max time network
    118s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04-08-2024 20:22

General

  • Target

    fa3f8212e3f1cf885d35ea36ef891350N.exe

  • Size

    3.1MB

  • MD5

    fa3f8212e3f1cf885d35ea36ef891350

  • SHA1

    49759e579fffe208716703aed27aa057913a6e08

  • SHA256

    78d043a6604624a4dbce3e3b284e49a297768218407213f17b5bfce17d97b6d5

  • SHA512

    98343b8274d5036613f04e17315de729e780f2441ba7be5d9f6bef2f314124c6caf8dd170f1b6479c9ec37225ebf40672f2303bb6814f018683a14a7cc166a0f

  • SSDEEP

    49152:3vyI22SsaNYfdPBldt698dBcjHjuDkE2HBk/+FxoGdFbTHHB72eh2NT:3vf22SsaNYfdPBldt6+dBcjHjuD+7

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

192.168.1.19:4782

Mutex

5c77ed4c-6371-4d16-85c9-eceeff9626f3

Attributes
  • encryption_key

    ED5632772B2E213D31112B5C6006F8881852B4E0

  • 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\fa3f8212e3f1cf885d35ea36ef891350N.exe
    "C:\Users\Admin\AppData\Local\Temp\fa3f8212e3f1cf885d35ea36ef891350N.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3264
    • 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:3028
    • 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:4148
      • 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:2352

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

    fa3f8212e3f1cf885d35ea36ef891350

    SHA1

    49759e579fffe208716703aed27aa057913a6e08

    SHA256

    78d043a6604624a4dbce3e3b284e49a297768218407213f17b5bfce17d97b6d5

    SHA512

    98343b8274d5036613f04e17315de729e780f2441ba7be5d9f6bef2f314124c6caf8dd170f1b6479c9ec37225ebf40672f2303bb6814f018683a14a7cc166a0f

  • memory/3264-0-0x00007FFBA6B53000-0x00007FFBA6B55000-memory.dmp

    Filesize

    8KB

  • memory/3264-1-0x0000000000170000-0x0000000000494000-memory.dmp

    Filesize

    3.1MB

  • memory/3264-2-0x00007FFBA6B50000-0x00007FFBA7611000-memory.dmp

    Filesize

    10.8MB

  • memory/3264-9-0x00007FFBA6B50000-0x00007FFBA7611000-memory.dmp

    Filesize

    10.8MB

  • memory/4148-10-0x00007FFBA6B50000-0x00007FFBA7611000-memory.dmp

    Filesize

    10.8MB

  • memory/4148-11-0x00007FFBA6B50000-0x00007FFBA7611000-memory.dmp

    Filesize

    10.8MB

  • memory/4148-12-0x000000001BAA0000-0x000000001BAF0000-memory.dmp

    Filesize

    320KB

  • memory/4148-13-0x000000001C2B0000-0x000000001C362000-memory.dmp

    Filesize

    712KB

  • memory/4148-14-0x00007FFBA6B50000-0x00007FFBA7611000-memory.dmp

    Filesize

    10.8MB