Analysis

  • max time kernel
    90s
  • max time network
    150s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240412-en
  • resource tags

    arch:x64arch:x86image:win11-20240412-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    12-04-2024 18:55

General

  • Target

    Client-built.exe

  • Size

    348KB

  • MD5

    46c2a971cec1f82ea7a338ab4a368f37

  • SHA1

    69b181896b53a27554a6535f61e1b1e785750f98

  • SHA256

    04b8bb3fc2b3311f5027fa536ec480a3211cbc4673efde460f59daf44a7a1f55

  • SHA512

    627ea3b4f030dc62fa13b8902dbc6d6e286e8ba93b08ae584f37d8dcc9933dfbe84dd27241510dd821bd58bb8f8621399cb85c4e35b35d7424c1e7be141fd80f

  • SSDEEP

    6144:MMNHXf500MOxK7ACSBybr7bbVJG6rCaI4CH0KM+:Zd50awACBlo6rPXCHs+

Malware Config

Extracted

Family

quasar

Version

1.3.0.0

Botnet

Office04

C2

Lunasplanet-29399.portmap.host:29399

Mutex

QSR_MUTEX_3gXoc7Rbb6gDK9k7Ha

Attributes
  • encryption_key

    huAtWMa1sVtLD6rMH8Yv

  • install_name

    SubClient.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    SubClient.exe

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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

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:4648
    • C:\Windows\SysWOW64\schtasks.exe
      "schtasks" /create /tn "SubClient.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\Client-built.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:4660
    • C:\Users\Admin\AppData\Roaming\SubDir\SubClient.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\SubClient.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2584
      • C:\Windows\SysWOW64\schtasks.exe
        "schtasks" /create /tn "SubClient.exe" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\SubClient.exe" /rl HIGHEST /f
        3⤵
        • Creates scheduled task(s)
        PID:3268

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

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

    Filesize

    348KB

    MD5

    46c2a971cec1f82ea7a338ab4a368f37

    SHA1

    69b181896b53a27554a6535f61e1b1e785750f98

    SHA256

    04b8bb3fc2b3311f5027fa536ec480a3211cbc4673efde460f59daf44a7a1f55

    SHA512

    627ea3b4f030dc62fa13b8902dbc6d6e286e8ba93b08ae584f37d8dcc9933dfbe84dd27241510dd821bd58bb8f8621399cb85c4e35b35d7424c1e7be141fd80f

  • memory/2584-19-0x0000000074480000-0x0000000074C31000-memory.dmp

    Filesize

    7.7MB

  • memory/2584-18-0x0000000006700000-0x000000000670A000-memory.dmp

    Filesize

    40KB

  • memory/2584-16-0x00000000050A0000-0x00000000050B0000-memory.dmp

    Filesize

    64KB

  • memory/2584-14-0x0000000074480000-0x0000000074C31000-memory.dmp

    Filesize

    7.7MB

  • memory/4648-3-0x0000000005600000-0x0000000005692000-memory.dmp

    Filesize

    584KB

  • memory/4648-6-0x0000000005B20000-0x0000000005B32000-memory.dmp

    Filesize

    72KB

  • memory/4648-7-0x0000000006830000-0x000000000686C000-memory.dmp

    Filesize

    240KB

  • memory/4648-5-0x00000000056A0000-0x0000000005706000-memory.dmp

    Filesize

    408KB

  • memory/4648-4-0x0000000005730000-0x0000000005740000-memory.dmp

    Filesize

    64KB

  • memory/4648-0-0x0000000000A90000-0x0000000000AEE000-memory.dmp

    Filesize

    376KB

  • memory/4648-15-0x0000000074480000-0x0000000074C31000-memory.dmp

    Filesize

    7.7MB

  • memory/4648-2-0x0000000005BB0000-0x0000000006156000-memory.dmp

    Filesize

    5.6MB

  • memory/4648-1-0x0000000074480000-0x0000000074C31000-memory.dmp

    Filesize

    7.7MB