Analysis

  • max time kernel
    135s
  • max time network
    162s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19-04-2024 11:09

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    2c1fba8d6624adf6c582fb2d5fb43b28

  • SHA1

    bd45ee984e9476d604824f83c6cf6111a9db2467

  • SHA256

    a5473ea4c4ef75c217e0d252d1c7d235b781a75810b7e731a97ed78b45646840

  • SHA512

    cc85b5f1c2765c49f34c236634dcbfdfd6cc62e0b954b74c12b0d89dc29044dff88a9840e5c02a39e140564283074c78359dd70dfc7f426daefb75f195f14e19

  • SSDEEP

    49152:nvVG42pda6D+/PjlLOlg6yQipV6iRJ67bR3LoGdTqTHHB72eh2NT:nvM42pda6D+/PjlLOlZyQipV6iRJ6ND

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

funlink.ddns.net:4444

quasarhost1.ddns.net:4444

Mutex

c363b2f8-fc6a-4abd-a753-cff1aad2a173

Attributes
  • encryption_key

    CE5FBAC1A56C8C780C74FE8E7CD5CBCF8ABD6C8D

  • install_name

    updale.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    windows av startup

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 1 IoCs
  • Drops file in System32 directory 2 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 2 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⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1504
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "windows av startup" /sc ONLOGON /tr "C:\Windows\system32\SubDir\updale.exe" /rl HIGHEST /f
      2⤵
      • Creates scheduled task(s)
      PID:1436
  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4144 --field-trial-handle=2276,i,11674642242468042059,14711253743544118298,262144 --variations-seed-version /prefetch:8
    1⤵
      PID:2720

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • memory/1504-0-0x00000000005D0000-0x00000000008F4000-memory.dmp

      Filesize

      3.1MB

    • memory/1504-1-0x00007FFA05EA0000-0x00007FFA06961000-memory.dmp

      Filesize

      10.8MB

    • memory/1504-2-0x000000001B600000-0x000000001B610000-memory.dmp

      Filesize

      64KB

    • memory/1504-3-0x00007FFA05EA0000-0x00007FFA06961000-memory.dmp

      Filesize

      10.8MB

    • memory/1504-4-0x000000001B600000-0x000000001B610000-memory.dmp

      Filesize

      64KB