Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260911-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    16/09/2026, 02:03

General

  • Target
    Client-built.exe
  • Size 3.1MB
  • Sample260916-cgrt1svdlf
  • SHA256 c942848d67d5a09c9b125ae5ad923303535ff2a269ba2034f9347014c849568d
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • quasar

Version
  • 1.4.1

Botnet
  • Office04

C2
  • x88mi.com:443

  • www.x88mi.com:443

  • x88mi.com:80

  • www.x88mi.com:80

  • www.ao88mi.com:443

  • ao88mi.com:443

  • www.ao88mi.com:80

  • ao88mi.com:80

  • www.kuy88.xyz:80

  • kuy88.xyz:80

Mutex
  • 20ba99d2-1ee6-4390-8659-98fb45299cc2

Attributes
  • encryption_key

    B0D881BBD5D7A35DA4AD369AB33EA64F85982C06

  • install_name

    Client.exe

  • key_salt

    bfeb1e56fbcd973bb219022430a57843003d5644d21e62b9d4f180e7e6c33941

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Quasar Client Startup

  • subdirectory

    SubDir

Signatures

  • Family: Quasar RAT

    Quasar is an open source Remote Access Tool.

  • Quasar payload 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 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 FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    PID:3984

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        memory/3984-0-0x00007FFDCD7AF000-0x00007FFDCD7B0000-memory.dmp

        memory/3984-1-0x0000000000600000-0x0000000000924000-memory.dmp

        memory/3984-2-0x00007FFDCD620000-0x00007FFDCDFC4000-memory.dmp

        memory/3984-3-0x00007FFDCD620000-0x00007FFDCDFC4000-memory.dmp

        memory/3984-4-0x00007FFDCD620000-0x00007FFDCDFC4000-memory.dmp

        memory/3984-5-0x00007FFDCD620000-0x00007FFDCDFC4000-memory.dmp

        memory/3984-6-0x00007FFDCD620000-0x00007FFDCDFC4000-memory.dmp

        memory/3984-7-0x00007FFDCD620000-0x00007FFDCDFC4000-memory.dmp

        memory/3984-8-0x00007FFDCD620000-0x00007FFDCDFC4000-memory.dmp

        memory/3984-9-0x00007FFDCD620000-0x00007FFDCDFC4000-memory.dmp

        memory/3984-10-0x00007FFDCD620000-0x00007FFDCDFC4000-memory.dmp

        memory/3984-11-0x00007FFDCD620000-0x00007FFDCDFC4000-memory.dmp

        memory/3984-12-0x00007FFDCD620000-0x00007FFDCDFC4000-memory.dmp

        memory/3984-13-0x00007FFDCD620000-0x00007FFDCDFC4000-memory.dmp

        memory/3984-14-0x00007FFDCD620000-0x00007FFDCDFC4000-memory.dmp

        memory/3984-15-0x000000001C900000-0x000000001C950000-memory.dmp

        memory/3984-16-0x000000001CA10000-0x000000001CAC2000-memory.dmp

        memory/3984-17-0x00007FFDCD620000-0x00007FFDCDFC4000-memory.dmp

        memory/3984-18-0x00007FFDCD620000-0x00007FFDCDFC4000-memory.dmp