Analysis

  • max time kernel
    144s
  • max time network
    154s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240508-en
  • resource tags

    arch:x64arch:x86image:win11-20240508-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    16-05-2024 07:19

General

  • Target

    566ba756b7fc2174fc195c05d9e0a36aa706e4ce397f890488227b7d0ad4ad7c.exe

  • Size

    3.1MB

  • MD5

    4a603ec4e3c5a21400eaabac7c6401c6

  • SHA1

    23b446721eacd0b6796407ca20bd1e01355ab41f

  • SHA256

    566ba756b7fc2174fc195c05d9e0a36aa706e4ce397f890488227b7d0ad4ad7c

  • SHA512

    070a5dd14bce16ba58eb65f3b3143fc7890f0e34f2ed7f3a1930e3fa8454ebcf615b43c819f16f4fc494676443bd409a3a57e8fe6e8f39ab02df5ace497eaea0

  • SSDEEP

    49152:rvrI22SsaNYfdPBldt698dBcjHLCc1J2LoGdcTHHB72eh2NT:rvU22SsaNYfdPBldt6+dBcjHLCn

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

79.132.193.215:4782

Mutex

f99ccef5-65c4-4972-adf2-fb38921cc9fc

Attributes
  • encryption_key

    1C15E91ACCFAC60B043A1336CF6912EA8572BA83

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

Signatures

  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Suspicious use of WriteProcessMemory 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\566ba756b7fc2174fc195c05d9e0a36aa706e4ce397f890488227b7d0ad4ad7c.exe
    "C:\Users\Admin\AppData\Local\Temp\566ba756b7fc2174fc195c05d9e0a36aa706e4ce397f890488227b7d0ad4ad7c.exe"
    1⤵
    • Drops file in System32 directory
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4804
    • C:\Windows\system32\Client.exe
      "C:\Windows\system32\Client.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      PID:4668

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Windows\System32\Client.exe

    Filesize

    3.1MB

    MD5

    4a603ec4e3c5a21400eaabac7c6401c6

    SHA1

    23b446721eacd0b6796407ca20bd1e01355ab41f

    SHA256

    566ba756b7fc2174fc195c05d9e0a36aa706e4ce397f890488227b7d0ad4ad7c

    SHA512

    070a5dd14bce16ba58eb65f3b3143fc7890f0e34f2ed7f3a1930e3fa8454ebcf615b43c819f16f4fc494676443bd409a3a57e8fe6e8f39ab02df5ace497eaea0

  • memory/4668-9-0x00007FFFFCD40000-0x00007FFFFD802000-memory.dmp

    Filesize

    10.8MB

  • memory/4668-10-0x00007FFFFCD40000-0x00007FFFFD802000-memory.dmp

    Filesize

    10.8MB

  • memory/4668-11-0x000000001C390000-0x000000001C3E0000-memory.dmp

    Filesize

    320KB

  • memory/4668-12-0x000000001C4A0000-0x000000001C552000-memory.dmp

    Filesize

    712KB

  • memory/4668-13-0x00007FFFFCD40000-0x00007FFFFD802000-memory.dmp

    Filesize

    10.8MB

  • memory/4804-0-0x00007FFFFCD43000-0x00007FFFFCD45000-memory.dmp

    Filesize

    8KB

  • memory/4804-1-0x00000000003F0000-0x0000000000714000-memory.dmp

    Filesize

    3.1MB

  • memory/4804-2-0x00007FFFFCD40000-0x00007FFFFD802000-memory.dmp

    Filesize

    10.8MB

  • memory/4804-8-0x00007FFFFCD40000-0x00007FFFFD802000-memory.dmp

    Filesize

    10.8MB