Analysis

  • max time kernel
    150s
  • max time network
    154s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260709-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    04/08/2026, 12:15

General

  • Target
    2026-08-03_43688c75a41d85b8c4a8452a7e8675b0_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe
  • Size 14.8MB
  • Sample260804-pfa64azcrg
  • SHA256 11902acdcef91fbafa0107185de0963bb122b79b732ecb1c1691a92259493a22
  • 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.

  • Windows security bypass 2 TTPs 1 IoCs
  • 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.

  • Creates new service(s) 2 TTPs
  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • 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.

  • Program crash 2 IoCs
  • 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\2026-08-03_43688c75a41d85b8c4a8452a7e8675b0_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe
    "C:\Users\Admin\AppData\Local\Temp\2026-08-03_43688c75a41d85b8c4a8452a7e8675b0_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2452
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pxhtrsxc\
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      PID:3860
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\iyujewuc.exe" C:\Windows\SysWOW64\pxhtrsxc\
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      PID:4060
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create pxhtrsxc binPath= "C:\Windows\SysWOW64\pxhtrsxc\iyujewuc.exe /d\"C:\Users\Admin\AppData\Local\Temp\2026-08-03_43688c75a41d85b8c4a8452a7e8675b0_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1712
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description pxhtrsxc "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5176
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start pxhtrsxc
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3476
    • 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:2500
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2452 -s 1084
      2⤵
      • Program crash
      PID:3060
  • C:\Windows\SysWOW64\pxhtrsxc\iyujewuc.exe
    C:\Windows\SysWOW64\pxhtrsxc\iyujewuc.exe /d"C:\Users\Admin\AppData\Local\Temp\2026-08-03_43688c75a41d85b8c4a8452a7e8675b0_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4480
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Windows security bypass
      • 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:5196
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4480 -s 592
      2⤵
      • Program crash
      PID:3428
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 4480 -ip 4480
    1⤵
      PID:4876
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2452 -ip 2452
      1⤵
        PID:1260

      Network

            MITRE ATT&CK Enterprise v16

            Replay Monitor

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            Downloads

            iyujewuc.exe

            • Path C:\Users\Admin\AppData\Local\Temp\iyujewuc.exe
            • Size 11.6MB
            • SHA256 ba5d0fedb0dd90c65affb0ae9a5d17d40d951fe5ea01a4a6f736b22974e7a929
            • MD5 SHA1 SHA512 SSDEEP TLSH

            memory/2452-10-0x0000000002800000-0x0000000002813000-memory.dmp

            memory/2452-1-0x0000000002820000-0x0000000002920000-memory.dmp

            memory/2452-2-0x0000000002800000-0x0000000002813000-memory.dmp

            memory/5196-40-0x0000000002B20000-0x0000000002B30000-memory.dmp

            memory/5196-34-0x0000000002B20000-0x0000000002B30000-memory.dmp

            memory/5196-13-0x0000000000E90000-0x0000000000EA5000-memory.dmp

            memory/5196-19-0x00000000021A0000-0x00000000021A6000-memory.dmp

            memory/5196-21-0x0000000002B20000-0x0000000002B30000-memory.dmp

            memory/5196-18-0x0000000003910000-0x0000000003B1F000-memory.dmp

            memory/5196-39-0x0000000002B20000-0x0000000002B30000-memory.dmp

            memory/5196-44-0x0000000002B30000-0x0000000002B35000-memory.dmp

            memory/5196-49-0x0000000008620000-0x0000000008627000-memory.dmp

            memory/5196-48-0x00000000080D0000-0x00000000084DB000-memory.dmp

            memory/5196-45-0x00000000080D0000-0x00000000084DB000-memory.dmp

            memory/5196-41-0x0000000002B30000-0x0000000002B35000-memory.dmp

            memory/5196-7-0x0000000000E90000-0x0000000000EA5000-memory.dmp

            memory/5196-38-0x0000000002B20000-0x0000000002B30000-memory.dmp

            memory/5196-37-0x0000000002B20000-0x0000000002B30000-memory.dmp

            memory/5196-12-0x0000000000E90000-0x0000000000EA5000-memory.dmp

            memory/5196-35-0x0000000002B20000-0x0000000002B30000-memory.dmp

            memory/5196-33-0x0000000002B20000-0x0000000002B30000-memory.dmp

            memory/5196-32-0x0000000002B20000-0x0000000002B30000-memory.dmp

            memory/5196-31-0x0000000002B20000-0x0000000002B30000-memory.dmp

            memory/5196-30-0x0000000002B20000-0x0000000002B30000-memory.dmp

            memory/5196-29-0x0000000002B20000-0x0000000002B30000-memory.dmp

            memory/5196-28-0x0000000002B20000-0x0000000002B30000-memory.dmp

            memory/5196-27-0x0000000002B20000-0x0000000002B30000-memory.dmp

            memory/5196-26-0x0000000002B20000-0x0000000002B30000-memory.dmp

            memory/5196-25-0x0000000002B20000-0x0000000002B30000-memory.dmp

            memory/5196-24-0x0000000002B20000-0x0000000002B30000-memory.dmp

            memory/5196-15-0x0000000003910000-0x0000000003B1F000-memory.dmp

            memory/5196-36-0x0000000002B20000-0x0000000002B30000-memory.dmp