Analysis

  • max time kernel
    436s
  • max time network
    624s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240704-en
  • resource tags

    arch:x64arch:x86image:win11-20240704-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    06/07/2024, 14:05

General

  • Target

    pegasus.exe

  • Size

    3.1MB

  • MD5

    2e46c4fb200c850394e4e708d4c0d36b

  • SHA1

    dbeae23123b58434eedf7a0462dda53b7ae0fc01

  • SHA256

    198076159ed4e2443380f81b53f506807e3ef4cca8692084922744548e5383bf

  • SHA512

    a0c8ec64b280a3c2800cb300d464340a4de79dea2907b3c1d66bb2f54d447794e20f8097d2be6299ae04a395891d33589531142cdc7516131d9afe4e7ac0a8c2

  • SSDEEP

    49152:3vgt62XlaSFNWPjljiFa2RoUYIyKAi+h8vJihoGdJoTHHB72eh2NT:3vM62XlaSFNWPjljiFXRoUYIMhb5

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

90.219.112.122:4782

Mutex

878b2fb4-192c-4f50-ae38-0881a431b12f

Attributes
  • encryption_key

    DB1FE6851C4D98E11497D9AF06379F8966EC065A

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Java Updater

  • subdirectory

    SubDir

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Modifies registry class 1 IoCs
  • Scheduled Task/Job: Scheduled Task 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 SetWindowsHookEx 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\pegasus.exe
    "C:\Users\Admin\AppData\Local\Temp\pegasus.exe"
    1⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4748
    • C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Java Updater" /sc ONLOGON /tr "C:\Windows\system32\SubDir\Client.exe" /rl HIGHEST /f
      2⤵
      • Scheduled Task/Job: Scheduled Task
      PID:1452
  • C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe
    "C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\MiniSearchHost.exe" -ServerName:MiniSearchUI.AppXj3y73at8fy1htwztzxs68sxx1v7cksp7.mca
    1⤵
    • Modifies registry class
    • Suspicious use of SetWindowsHookEx
    PID:1216
  • C:\Windows\system32\svchost.exe
    C:\Windows\system32\svchost.exe -k LocalService -p -s NPSMSvc
    1⤵
      PID:3640
    • C:\Windows\System32\rundll32.exe
      C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
      1⤵
        PID:3756

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\TempState\SearchHoverUnifiedTileModelCache.dat

        Filesize

        10KB

        MD5

        86bc1f430c46c1c8597ba754a8855be9

        SHA1

        8be41ec9fb15b246f9c107545ad15314d1160f01

        SHA256

        9f277094b7ff8fe8e320026497542a0b52e2a1be8b108a63a83e8371e0a6bf86

        SHA512

        47655f29fd07921c53d98051c1ce3408b94bb03284526f4cd273e92359e54342233aee4cae1161863df84f17e870f9bb8b80bb7e70c8662280e9a79744fe9e94

      • C:\Users\Admin\AppData\Local\Packages\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\TempState\SearchHoverUnifiedTileModelCache.dat

        Filesize

        10KB

        MD5

        d99739e3657b8a4c1259c604069954dd

        SHA1

        450004f5f1c436cc1302bd51dbe81141a6e847e1

        SHA256

        91695bb6bd03a200dfc32e50bf858bcd7d95b598196ae5df7d5bfd1add9ecb36

        SHA512

        bd2f5ca319a57a642a7992533ba0903883134e1460de1598561f72828c20c68e5b3a752defef21962567181e5158df116d725c70bbe1f0042dbc6870b5075dae

      • memory/4748-0-0x00007FFC16303000-0x00007FFC16305000-memory.dmp

        Filesize

        8KB

      • memory/4748-1-0x0000000000020000-0x0000000000344000-memory.dmp

        Filesize

        3.1MB

      • memory/4748-2-0x00007FFC16300000-0x00007FFC16DC2000-memory.dmp

        Filesize

        10.8MB

      • memory/4748-4-0x00007FFC16303000-0x00007FFC16305000-memory.dmp

        Filesize

        8KB

      • memory/4748-5-0x00007FFC16300000-0x00007FFC16DC2000-memory.dmp

        Filesize

        10.8MB