Overview

overview

10

Static

static

10

RCFB88.exe

windows10-2004-x64

10

RCFB88.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260618-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260618-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    24/06/2026, 14:06

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General

  • Target
    RCFB88.exe
  • Size 226KB
  • Sample260624-rem6dacz2j
  • SHA256 3061e2a6b00e4874345eb1e9dcab0e2390e0073608b31e5925e27af462ccff1a
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
adwareremotehostdiscoveryremcospersistenceransomwareratspywareupx

Malware Config

Extracted

Family

  • remcos

Version

  • 7.2.5 Light

Botnet

  • RemoteHost

C2

  • fb88.farm:443

Attributes
  • audio_folder

    MicRecords

  • audio_path

    ApplicationPath

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    remcos.exe

  • copy_folder

    Remcos

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    false

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-Q19OE5

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Family: Remcos

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

    ratremcos
  • Boot or Logon Autostart Execution: Active Setup 2 TTPs 1 IoCs

    Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

    persistence
  • Enumerates connected drives 3 TTPs 2 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • UPX packed file 16 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

    upx
  • System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

    discovery
  • Checks SCSI registry key(s) 3 TTPs 62 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Modifies Internet Explorer settings 1 TTPs 1 IoCs
    adwarespyware
  • Modifies registry class 38 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 32 IoCs
  • Suspicious use of FindShellTrayWindow 54 IoCs
  • Suspicious use of SendNotifyMessage 43 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 1 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.

    persistence
  • Uses Volume Shadow Copy WMI provider

    The Volume Shadow Copy service is used to manage backups/snapshots.

    ransomware
  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

    ransomware

Processes

  • C:\Users\Admin\AppData\Local\Temp\RCFB88.exe
    "C:\Users\Admin\AppData\Local\Temp\RCFB88.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    PID:1476
  • C:\Windows\system32\sihost.exe
    sihost.exe
    1⤵
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of WriteProcessMemory
    PID:1256
    • C:\Windows\explorer.exe
      explorer.exe /LOADSAVEDWINDOWS
      2⤵
      • Boot or Logon Autostart Execution: Active Setup
      • Enumerates connected drives
      • Checks SCSI registry key(s)
      • Modifies Internet Explorer settings
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      PID:4920
  • C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\SearchHost.exe
    "C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\SearchHost.exe" -ServerName:CortanaUI.AppXstmwaab17q5s3y22tp6apqz7a45vwv65.mca
    1⤵
    • Modifies registry class
    • Suspicious use of SetWindowsHookEx
    PID:3404
  • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
    "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
    1⤵
    • Modifies registry class
    • Suspicious use of SetWindowsHookEx
    PID:4052

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        prep_Activatable Class_Hermes_perf.cache
        • Path C:\Users\Admin\AppData\Local\Packages\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\TempState\prep_Activatable Class_Hermes_perf.cache
        • Size 607B
        • SHA256 be6b74e52e5eef1f1c27c0976bf3bf1bfa99958c00bbef2898a602f691be6dae
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        prep_Activatable Class_Hermes_perf.cache
        • Path C:\Users\Admin\AppData\Local\Packages\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\TempState\prep_Activatable Class_Hermes_perf.cache
        • Size 599B
        • SHA256 b536a3dae9ea5c69081f0491eed829e3b57e32401fdf49a63031bcd6b20e6fdb
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        memory/1476-4-0x0000000000400000-0x000000000048A000-memory.dmp
        Download

        memory/1476-200-0x0000000000400000-0x000000000048A000-memory.dmp
        Download

        memory/1476-187-0x0000000000400000-0x000000000048A000-memory.dmp
        Download

        memory/1476-5-0x0000000000400000-0x000000000048A000-memory.dmp
        Download

        memory/1476-6-0x0000000000400000-0x000000000048A000-memory.dmp
        Download

        memory/1476-7-0x0000000000400000-0x000000000048A000-memory.dmp
        Download

        memory/1476-2-0x0000000000400000-0x000000000048A000-memory.dmp
        Download

        memory/1476-1-0x0000000000489000-0x000000000048A000-memory.dmp
        Download

        memory/1476-202-0x0000000000400000-0x000000000048A000-memory.dmp
        Download

        memory/1476-3-0x0000000000400000-0x000000000048A000-memory.dmp
        Download

        memory/1476-0-0x0000000000400000-0x000000000048A000-memory.dmp
        Download

        memory/1476-198-0x0000000000400000-0x000000000048A000-memory.dmp
        Download

        memory/1476-195-0x0000000000400000-0x000000000048A000-memory.dmp
        Download

        memory/1476-193-0x0000000000400000-0x000000000048A000-memory.dmp
        Download

        memory/1476-191-0x0000000000400000-0x000000000048A000-memory.dmp
        Download

        memory/1476-185-0x0000000000400000-0x000000000048A000-memory.dmp
        Download

        memory/1476-189-0x0000000000400000-0x000000000048A000-memory.dmp
        Download

        memory/3404-37-0x000001F913E90000-0x000001F913F90000-memory.dmp
        Download

        memory/3404-43-0x000001F903C90000-0x000001F903CB0000-memory.dmp
        Download

        memory/3404-54-0x000001F9142D0000-0x000001F9142F0000-memory.dmp
        Download

        memory/3404-27-0x000001F9001E0000-0x000001F9002E0000-memory.dmp
        Download

        memory/3404-36-0x000001F903A30000-0x000001F903A50000-memory.dmp
        Download

        memory/3404-28-0x000001F9001E0000-0x000001F9002E0000-memory.dmp
        Download

        memory/3404-26-0x000001F9001E0000-0x000001F9002E0000-memory.dmp
        Download

        memory/4920-186-0x000000000E670000-0x000000000E6C0000-memory.dmp
        Download