Analysis

  • max time kernel
    149s
  • max time network
    149s
  • 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, 04:12

General

  • Target
    2026-04-16_eccfd4adaa6de564e34de750b8737893_amadey_elex_glassworm_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe
  • Size 12.3MB
  • Sample260416-esnylsft2q
  • SHA256 ec5365e13ba213676273f431f71707d2a16e0f61d1bb445d23ee37d2b269623a
  • 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_eccfd4adaa6de564e34de750b8737893_amadey_elex_glassworm_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe
    "C:\Users\Admin\AppData\Local\Temp\2026-04-16_eccfd4adaa6de564e34de750b8737893_amadey_elex_glassworm_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2288
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rfcqedag\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3692
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zplavnlt.exe" C:\Windows\SysWOW64\rfcqedag\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2344
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create rfcqedag binPath= "C:\Windows\SysWOW64\rfcqedag\zplavnlt.exe /d\"C:\Users\Admin\AppData\Local\Temp\2026-04-16_eccfd4adaa6de564e34de750b8737893_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:5092
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description rfcqedag "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1856
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start rfcqedag
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1492
    • 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:1296
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2288 -s 1324
      2⤵
      • Program crash
      PID:2804
  • C:\Windows\SysWOW64\rfcqedag\zplavnlt.exe
    C:\Windows\SysWOW64\rfcqedag\zplavnlt.exe /d"C:\Users\Admin\AppData\Local\Temp\2026-04-16_eccfd4adaa6de564e34de750b8737893_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:4288
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • System Location Discovery: System Language Discovery
      PID:2956
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4288 -s 556
      2⤵
      • Program crash
      PID:1564
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 4288 -ip 4288
    1⤵
      PID:3976
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 2288 -ip 2288
      1⤵
        PID:3824

      Network

            MITRE ATT&CK Enterprise v16

            Replay Monitor

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            Downloads

            zplavnlt.exe

            • Path C:\Users\Admin\AppData\Local\Temp\zplavnlt.exe
            • Size 12.5MB
            • SHA256 2296946a0ead578e0e66f549ce00ecea1ef457012cb6180085a3a75f92c3f148
            • MD5 SHA1 SHA512 SSDEEP TLSH

            memory/2288-1-0x0000000002730000-0x0000000002830000-memory.dmp

            memory/2288-2-0x00000000043B0000-0x00000000043C3000-memory.dmp

            memory/2288-11-0x00000000043B0000-0x00000000043C3000-memory.dmp

            memory/2956-7-0x0000000000330000-0x0000000000345000-memory.dmp

            memory/2956-12-0x0000000000330000-0x0000000000345000-memory.dmp

            memory/2956-13-0x0000000000330000-0x0000000000345000-memory.dmp