Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260130-en
  • resource tags

    arch:x64arch:x86image:win11-20260130-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    15/04/2026, 04:31

General

  • Target
    2026-04-15_90b2d5bfbbc14fccec32d71856bde388_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe
  • Size 11.1MB
  • Sample260415-e5jjnaex7l
  • SHA256 af6e3ed94f84ef0bff8baf71ad15bf9ac4b9e285227ffa8b98cc63d87846357c
  • 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\2026-04-15_90b2d5bfbbc14fccec32d71856bde388_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe
    "C:\Users\Admin\AppData\Local\Temp\2026-04-15_90b2d5bfbbc14fccec32d71856bde388_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2992
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hdnoedix\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4336
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\elsvkyrb.exe" C:\Windows\SysWOW64\hdnoedix\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3052
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create hdnoedix binPath= "C:\Windows\SysWOW64\hdnoedix\elsvkyrb.exe /d\"C:\Users\Admin\AppData\Local\Temp\2026-04-15_90b2d5bfbbc14fccec32d71856bde388_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:656
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description hdnoedix "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4460
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start hdnoedix
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1508
    • 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:5056
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2992 -s 1096
      2⤵
      • Program crash
      PID:3792
  • C:\Windows\SysWOW64\hdnoedix\elsvkyrb.exe
    C:\Windows\SysWOW64\hdnoedix\elsvkyrb.exe /d"C:\Users\Admin\AppData\Local\Temp\2026-04-15_90b2d5bfbbc14fccec32d71856bde388_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:4364
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • System Location Discovery: System Language Discovery
      PID:4548
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4364 -s 556
      2⤵
      • Program crash
      PID:2984
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 4364 -ip 4364
    1⤵
      PID:3220
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 2992 -ip 2992
      1⤵
        PID:2160

      Network

            MITRE ATT&CK Enterprise v16

            Replay Monitor

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            Downloads

            elsvkyrb.exe

            • Path C:\Users\Admin\AppData\Local\Temp\elsvkyrb.exe
            • Size 15.0MB
            • SHA256 d2b5b29a64ec24a29002448a4a055d54d452b24b96891f78e25d03881cb6b58f
            • MD5 SHA1 SHA512 SSDEEP TLSH

            memory/2992-2-0x0000000002820000-0x0000000002833000-memory.dmp

            memory/2992-1-0x0000000002870000-0x0000000002970000-memory.dmp

            memory/2992-11-0x0000000002820000-0x0000000002833000-memory.dmp

            memory/4548-7-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

            memory/4548-12-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

            memory/4548-13-0x0000000000FC0000-0x0000000000FD5000-memory.dmp