Overview

overview

10

Static

static

10

66.exe

windows10-2004-x64

10

66.exe

windows10-ltsc_2021-x64

10

66.exe

windows11-21h2-x64

10

66.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-ltsc_2021_x64
  • resource
    win10ltsc2021-20260911-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20260911-enlocale:en-usos:windows10-ltsc_2021-x64systemwindows
  • submitted
    26/10/2026, 10:03

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General

  • Target
    66.exe
  • Size 644KB
  • Sample261026-l3cfwset8k
  • SHA256 9e434428e34bed79cbac5ab8322e2f2de6c2214d85204c193214c9f200888a5f
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
beyeugroupdiscoveryremcospersistenceratsuricata

Malware Config

Extracted

Family

  • remcos

Version

  • 7.3.1 Pro

Botnet

  • BeYeuGroup

C2

  • redmob.cc:8080

  • qq88.fan:8080

  • luck80.net:8080

  • add.hk.com:8080

  • 8kbetn.net:8080

  • 8kbett.shop:8080

  • 8kbett.icu:8080

  • 8kbett.one:8080

  • w88vt.com:8080

  • qh88.casino:8080

  • 8kbet.hk.com:8080

  • qq88.studio:8080

Attributes
  • audio_folder

    MicRecords

  • audio_path

    ApplicationPath

  • audio_record_time

    5

  • connect_delay

    0AssignedName=tele@VietNamReport

  • connect_interval

    5

  • copy_file

    Updater.exe

  • copy_folder

    byg

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    true

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-LNRTWZ

  • screenshot_crypt

    false

  • screenshot_flag

    true

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    

  • take_screenshot_option

    true

  • take_screenshot_time

    5

  • take_screenshot_title

    facebook;discord;telegram

Signatures

  • Family: Remcos

    Remcos is a closed-source remote control and surveillance software.

    ratremcos
  • Suricata alert: REMCOS RAT Malware Outbound C2 Communication 64 IoCs

    Network activity triggered a Suricata alert

    suricataremcos
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 4 IoCs
    persistence
  • Enumerates physical storage devices 1 TTPs

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

  • Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

    The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

    discovery
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • 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 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\66.exe
    "C:\Users\Admin\AppData\Local\Temp\66.exe"
    1⤵
    • Checks computer location settings
    • Adds Run key to start application
    • Suspicious use of WriteProcessMemory
    PID:2716
    • C:\ProgramData\byg\Updater.exe
      "C:\ProgramData\byg\Updater.exe"
      2⤵
      • Suricata alert: REMCOS RAT Malware Outbound C2 Communication
      • Executes dropped EXE
      • Adds Run key to start application
      • Reads the TCP/IP host and domain name from the registry
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      PID:4252
  • C:\Windows\system32\AUDIODG.EXE
    C:\Windows\system32\AUDIODG.EXE 0x2f8 0x2ec
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1876

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        Updater.exe
        • Path C:\ProgramData\byg\Updater.exe
        • Size 644KB
        • SHA256 9e434428e34bed79cbac5ab8322e2f2de6c2214d85204c193214c9f200888a5f
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        logs.dat
        • Path C:\ProgramData\remcos\logs.dat
        • Size 214B
        • SHA256 ab69d9e6feccc30f144195650ae4f390db7bf024c80c7c16bc22205091e71a4d
        • MD5 SHA1 SHA512 TLSH
        Submit Download