Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    29/05/2026, 03:53

General

  • Target
    2026-05-29_f558f5d8b2b556748f7bcd320a020a82_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe
  • Size 14.3MB
  • Sample260529-eftnbscv81
  • SHA256 9b9788dee2de6cd631e5aae62644f7f787fe59e1995ccf54e0ac2d0c9c6e72e8
  • 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.

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

  • 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.

  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2026-05-29_f558f5d8b2b556748f7bcd320a020a82_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe
    "C:\Users\Admin\AppData\Local\Temp\2026-05-29_f558f5d8b2b556748f7bcd320a020a82_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4908
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\eximdjrr\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3212
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xnnkwiyw.exe" C:\Windows\SysWOW64\eximdjrr\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3164
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create eximdjrr binPath= "C:\Windows\SysWOW64\eximdjrr\xnnkwiyw.exe /d\"C:\Users\Admin\AppData\Local\Temp\2026-05-29_f558f5d8b2b556748f7bcd320a020a82_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:4200
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description eximdjrr "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3624
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start eximdjrr
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5012
    • 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:4036
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4908 -s 1096
      2⤵
      • Program crash
      PID:3524
  • C:\Windows\SysWOW64\eximdjrr\xnnkwiyw.exe
    C:\Windows\SysWOW64\eximdjrr\xnnkwiyw.exe /d"C:\Users\Admin\AppData\Local\Temp\2026-05-29_f558f5d8b2b556748f7bcd320a020a82_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:1800
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • System Location Discovery: System Language Discovery
      PID:3764
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1800 -s 560
      2⤵
      • Program crash
      PID:4476
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 1800 -ip 1800
    1⤵
      PID:3620
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 4908 -ip 4908
      1⤵
        PID:2096

      Network

            MITRE ATT&CK Enterprise v16

            Replay Monitor

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            Downloads

            xnnkwiyw.exe

            • Path C:\Users\Admin\AppData\Local\Temp\xnnkwiyw.exe
            • Size 12.9MB
            • SHA256 5dd51518f4c6f06f5e144f2f497538e6d80da49caf1e2998d7cbe1a275a06651
            • MD5 SHA1 SHA512 SSDEEP TLSH

            memory/3764-7-0x00000000001C0000-0x00000000001D5000-memory.dmp

            memory/3764-11-0x00000000001C0000-0x00000000001D5000-memory.dmp

            memory/3764-12-0x00000000001C0000-0x00000000001D5000-memory.dmp

            memory/4908-1-0x0000000002930000-0x0000000002A30000-memory.dmp

            memory/4908-2-0x00000000042D0000-0x00000000042E3000-memory.dmp