Analysis

  • max time kernel
    149s
  • max time network
    155s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260130-en
  • resource tags

    arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    16/04/2026, 03:58

General

  • Target
    2026-04-16_c694be6c7750b6ec4d340320b2cbfce1_amadey_elex_glassworm_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe
  • Size 14.2MB
  • Sample260416-ejnlgsav7x
  • SHA256 4f56fe8998601126576926a44594f8144d58b3d71d196846da692e6a45c92b89
  • 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\2026-04-16_c694be6c7750b6ec4d340320b2cbfce1_amadey_elex_glassworm_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe
    "C:\Users\Admin\AppData\Local\Temp\2026-04-16_c694be6c7750b6ec4d340320b2cbfce1_amadey_elex_glassworm_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3720
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rmrwpnak\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4936
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\sietogem.exe" C:\Windows\SysWOW64\rmrwpnak\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2600
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create rmrwpnak binPath= "C:\Windows\SysWOW64\rmrwpnak\sietogem.exe /d\"C:\Users\Admin\AppData\Local\Temp\2026-04-16_c694be6c7750b6ec4d340320b2cbfce1_amadey_elex_glassworm_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:5372
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description rmrwpnak "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5900
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start rmrwpnak
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3940
    • 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:3588
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3720 -s 1208
      2⤵
      • Program crash
      PID:4772
  • C:\Windows\SysWOW64\rmrwpnak\sietogem.exe
    C:\Windows\SysWOW64\rmrwpnak\sietogem.exe /d"C:\Users\Admin\AppData\Local\Temp\2026-04-16_c694be6c7750b6ec4d340320b2cbfce1_amadey_elex_glassworm_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:1700
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • System Location Discovery: System Language Discovery
      PID:3288
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1700 -s 556
      2⤵
      • Program crash
      PID:5632
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 1700 -ip 1700
    1⤵
      PID:5864
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 3720 -ip 3720
      1⤵
        PID:4296

      Network

            MITRE ATT&CK Enterprise v16

            Replay Monitor

            Loading Replay Monitor...

            Downloads

            sietogem.exe

            • Path C:\Users\Admin\AppData\Local\Temp\sietogem.exe
            • Size 11.7MB
            • SHA256 0a2dbbaca9771df07f6c2c2ebd53cc4c5adcc4dc6eccebe14d4c2eba3b840c30
            • MD5 SHA1 SHA512 SSDEEP TLSH

            memory/1700-10-0x0000000002C10000-0x0000000002C8B000-memory.dmp

            memory/3288-7-0x0000000000520000-0x0000000000535000-memory.dmp

            memory/3288-14-0x0000000000520000-0x0000000000535000-memory.dmp

            memory/3288-15-0x0000000000520000-0x0000000000535000-memory.dmp

            memory/3288-16-0x0000000001000000-0x000000000107B000-memory.dmp

            memory/3720-1-0x0000000002A90000-0x0000000002B90000-memory.dmp

            memory/3720-2-0x0000000004430000-0x0000000004443000-memory.dmp

            memory/3720-13-0x0000000004430000-0x0000000004443000-memory.dmp

            memory/3720-12-0x00000000029C0000-0x0000000002A3B000-memory.dmp