Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    18/08/2026, 05:11

General

  • Target
    2026-08-18_206e0fbf0ff2529ae678f6d723dca5f9_amadey_elex_njrat_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe
  • Size 12.0MB
  • Sample260818-ft93xaem91
  • SHA256 f8bb602cd4f981b2cf69988480592f9cfef1b822873aaa40e9602ea9c12b8427
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • tofsee

C2
  • vanaheim.cn

  • jotunheim.name

Signatures

  • Family: Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 3 TTPs 1 IoCs

    This determines the executable launched when a service starts. It can be used to establish persistence.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Creates new service(s) 2 TTPs
  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Stops running service(s) 4 TTPs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • Executes a command shell one-liner 1 TTPs 2 IoCs

    Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

  • System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

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

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2026-08-18_206e0fbf0ff2529ae678f6d723dca5f9_amadey_elex_njrat_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe
    "C:\Users\Admin\AppData\Local\Temp\2026-08-18_206e0fbf0ff2529ae678f6d723dca5f9_amadey_elex_njrat_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4260
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fszmikht\
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      PID:3956
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vyrcclmm.exe" C:\Windows\SysWOW64\fszmikht\
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      PID:2100
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create fszmikht binPath= "C:\Windows\SysWOW64\fszmikht\vyrcclmm.exe /d\"C:\Users\Admin\AppData\Local\Temp\2026-08-18_206e0fbf0ff2529ae678f6d723dca5f9_amadey_elex_njrat_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2012
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description fszmikht "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2696
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start fszmikht
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3128
    • C:\Windows\SysWOW64\netsh.exe
      "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
      2⤵
      • Modifies Windows Firewall
      • Event Triggered Execution: Netsh Helper DLL
      • System Location Discovery: System Language Discovery
      PID:3812
  • C:\Windows\SysWOW64\fszmikht\vyrcclmm.exe
    C:\Windows\SysWOW64\fszmikht\vyrcclmm.exe /d"C:\Users\Admin\AppData\Local\Temp\2026-08-18_206e0fbf0ff2529ae678f6d723dca5f9_amadey_elex_njrat_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5112
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:1020

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        vyrcclmm.exe

        • Path C:\Users\Admin\AppData\Local\Temp\vyrcclmm.exe
        • Size 13.9MB
        • SHA256 1598a84c661dc65fcae169f1ea359936c72f19e5b00e34307b9e5599e5d9f212
        • MD5 SHA1 SHA512 SSDEEP TLSH

        memory/1020-36-0x0000000002950000-0x0000000002960000-memory.dmp

        memory/1020-34-0x0000000002950000-0x0000000002960000-memory.dmp

        memory/1020-7-0x0000000001250000-0x0000000001265000-memory.dmp

        memory/1020-49-0x0000000007F80000-0x000000000838B000-memory.dmp

        memory/1020-12-0x0000000001250000-0x0000000001265000-memory.dmp

        memory/1020-13-0x0000000001250000-0x0000000001265000-memory.dmp

        memory/1020-39-0x0000000002950000-0x0000000002960000-memory.dmp

        memory/1020-50-0x00000000029F0000-0x00000000029F7000-memory.dmp

        memory/1020-35-0x0000000002950000-0x0000000002960000-memory.dmp

        memory/1020-45-0x00000000029E0000-0x00000000029E5000-memory.dmp

        memory/1020-42-0x00000000029E0000-0x00000000029E5000-memory.dmp

        memory/1020-41-0x0000000002950000-0x0000000002960000-memory.dmp

        memory/1020-40-0x0000000002950000-0x0000000002960000-memory.dmp

        memory/1020-38-0x0000000002950000-0x0000000002960000-memory.dmp

        memory/1020-16-0x0000000003000000-0x000000000320F000-memory.dmp

        memory/1020-37-0x0000000002950000-0x0000000002960000-memory.dmp

        memory/1020-46-0x0000000007F80000-0x000000000838B000-memory.dmp

        memory/1020-30-0x0000000002950000-0x0000000002960000-memory.dmp

        memory/1020-33-0x0000000002950000-0x0000000002960000-memory.dmp

        memory/1020-32-0x0000000002950000-0x0000000002960000-memory.dmp

        memory/1020-31-0x0000000002950000-0x0000000002960000-memory.dmp

        memory/1020-29-0x0000000002950000-0x0000000002960000-memory.dmp

        memory/1020-28-0x0000000002950000-0x0000000002960000-memory.dmp

        memory/1020-27-0x0000000002950000-0x0000000002960000-memory.dmp

        memory/1020-26-0x0000000002950000-0x0000000002960000-memory.dmp

        memory/1020-25-0x0000000002950000-0x0000000002960000-memory.dmp

        memory/1020-22-0x0000000002950000-0x0000000002960000-memory.dmp

        memory/1020-19-0x0000000002940000-0x0000000002946000-memory.dmp

        memory/1020-18-0x0000000003000000-0x000000000320F000-memory.dmp

        memory/4260-1-0x0000000002400000-0x0000000002500000-memory.dmp

        memory/4260-2-0x0000000003F20000-0x0000000003F33000-memory.dmp

        memory/4260-11-0x0000000003F20000-0x0000000003F33000-memory.dmp