Analysis

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

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    23/05/2026, 02:53

General

  • Target
    2026-05-23_bcbee0474dd9c573754ec1bb19c7d135_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe
  • Size 11.6MB
  • Sample260523-ddhbvaby2m
  • SHA256 7c69123e4717648d72d66a8bc37e428797d405037567c95c6d79f9e850fdecf2
  • 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\2026-05-23_bcbee0474dd9c573754ec1bb19c7d135_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe
    "C:\Users\Admin\AppData\Local\Temp\2026-05-23_bcbee0474dd9c573754ec1bb19c7d135_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1220
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dfmpugey\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4072
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bzowpfaw.exe" C:\Windows\SysWOW64\dfmpugey\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3768
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create dfmpugey binPath= "C:\Windows\SysWOW64\dfmpugey\bzowpfaw.exe /d\"C:\Users\Admin\AppData\Local\Temp\2026-05-23_bcbee0474dd9c573754ec1bb19c7d135_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:4900
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description dfmpugey "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:816
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start dfmpugey
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2680
    • 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:4012
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1220 -s 1320
      2⤵
      • Program crash
      PID:2984
  • C:\Windows\SysWOW64\dfmpugey\bzowpfaw.exe
    C:\Windows\SysWOW64\dfmpugey\bzowpfaw.exe /d"C:\Users\Admin\AppData\Local\Temp\2026-05-23_bcbee0474dd9c573754ec1bb19c7d135_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:4180
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • System Location Discovery: System Language Discovery
      PID:2780
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4180 -s 536
      2⤵
      • Program crash
      PID:2392
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 4180 -ip 4180
    1⤵
      PID:3148
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 1220 -ip 1220
      1⤵
        PID:2964

      Network

            MITRE ATT&CK Enterprise v16

            Replay Monitor

            Loading Replay Monitor...

            Downloads

            bzowpfaw.exe

            • Path C:\Users\Admin\AppData\Local\Temp\bzowpfaw.exe
            • Size 12.8MB
            • SHA256 4383753d9262dd507e5c061eb45c4e3cc60dccb6b80209faeafcec41a537470e
            • MD5 SHA1 SHA512 SSDEEP TLSH

            memory/1220-1-0x00000000027E0000-0x00000000028E0000-memory.dmp

            memory/1220-2-0x00000000042C0000-0x00000000042D3000-memory.dmp

            memory/1220-11-0x00000000042C0000-0x00000000042D3000-memory.dmp

            memory/2780-7-0x0000000000EF0000-0x0000000000F05000-memory.dmp

            memory/2780-12-0x0000000000EF0000-0x0000000000F05000-memory.dmp

            memory/2780-13-0x0000000000EF0000-0x0000000000F05000-memory.dmp