Analysis

  • max time kernel
    150s
  • max time network
    158s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240730-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240730-enlocale:en-usos:windows10-2004-x64system
  • submitted
    02-08-2024 07:53

General

  • Target

    Client-built.exe

  • Size

    3.1MB

  • MD5

    89211e15b473db84cfd447e3dbb4fdcd

  • SHA1

    1d861ff885aa2cd8dc11f01f1a0d202410349fa3

  • SHA256

    84a0907e7e112b593f99f0a7440eb3d74e71bf7dfe19d27c298a28042acf5e19

  • SHA512

    5fc2f8f646732efc65ab6d9cb94e9365d241f22fd30e586d8524bde3d7c37d700d32e0bae2faf762b75e98a3d799747f45cd724c2cadc36085645c7a97bcd671

  • SSDEEP

    49152:rvnI22SsaNYfdPBldt698dBcjHbfUu1vcLoGCITHHB72eh2NT:rvI22SsaNYfdPBldt6+dBcjHbfUx

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

C2

95.103.111.116:4782

Mutex

e1248b94-1e99-492a-b8c9-74b76d805a67

Attributes
  • encryption_key

    7661CB0AB05BF4FD5649849C60F4B3FADAEED859

  • install_name

    test.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
  • 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 SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 2 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:4840
    • C:\Users\Admin\AppData\Roaming\SubDir\test.exe
      "C:\Users\Admin\AppData\Roaming\SubDir\test.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      PID:2948
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:5088
    • C:\Windows\system32\svchost.exe
      C:\Windows\system32\svchost.exe -k LocalService -p -s fdPHost
      1⤵
        PID:4928

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        3.1MB

        MD5

        89211e15b473db84cfd447e3dbb4fdcd

        SHA1

        1d861ff885aa2cd8dc11f01f1a0d202410349fa3

        SHA256

        84a0907e7e112b593f99f0a7440eb3d74e71bf7dfe19d27c298a28042acf5e19

        SHA512

        5fc2f8f646732efc65ab6d9cb94e9365d241f22fd30e586d8524bde3d7c37d700d32e0bae2faf762b75e98a3d799747f45cd724c2cadc36085645c7a97bcd671

      • memory/2948-8-0x00007FF99B3D0000-0x00007FF99BE91000-memory.dmp

        Filesize

        10.8MB

      • memory/2948-10-0x00007FF99B3D0000-0x00007FF99BE91000-memory.dmp

        Filesize

        10.8MB

      • memory/2948-11-0x000000001C780000-0x000000001C7D0000-memory.dmp

        Filesize

        320KB

      • memory/2948-12-0x000000001C890000-0x000000001C942000-memory.dmp

        Filesize

        712KB

      • memory/2948-13-0x00007FF99B3D0000-0x00007FF99BE91000-memory.dmp

        Filesize

        10.8MB

      • memory/2948-14-0x000000001D3C0000-0x000000001D8E8000-memory.dmp

        Filesize

        5.2MB

      • memory/4840-0-0x00007FF99B3D3000-0x00007FF99B3D5000-memory.dmp

        Filesize

        8KB

      • memory/4840-1-0x0000000000970000-0x0000000000C94000-memory.dmp

        Filesize

        3.1MB

      • memory/4840-2-0x00007FF99B3D0000-0x00007FF99BE91000-memory.dmp

        Filesize

        10.8MB

      • memory/4840-9-0x00007FF99B3D0000-0x00007FF99BE91000-memory.dmp

        Filesize

        10.8MB