Analysis

  • max time kernel
    149s
  • max time network
    144s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    03/06/2026, 22:28

General

  • Target
    2026-06-03_4c99e7df3001d894a3e73b47eee46311_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe
  • Size 10.3MB
  • Sample260603-2dn2dsez7s
  • SHA256 db09bcc3d540ad33bc6430bc273e66d5ec2ae86e7da7af2b6e248da5ac2bb2a9
  • 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\2026-06-03_4c99e7df3001d894a3e73b47eee46311_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe
    "C:\Users\Admin\AppData\Local\Temp\2026-06-03_4c99e7df3001d894a3e73b47eee46311_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2984
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cmdumtcv\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5104
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\oinlgjgi.exe" C:\Windows\SysWOW64\cmdumtcv\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4456
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create cmdumtcv binPath= "C:\Windows\SysWOW64\cmdumtcv\oinlgjgi.exe /d\"C:\Users\Admin\AppData\Local\Temp\2026-06-03_4c99e7df3001d894a3e73b47eee46311_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:5088
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description cmdumtcv "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2172
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start cmdumtcv
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2392
    • 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:5996
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2984 -s 824
      2⤵
      • Program crash
      PID:4444
  • C:\Windows\SysWOW64\cmdumtcv\oinlgjgi.exe
    C:\Windows\SysWOW64\cmdumtcv\oinlgjgi.exe /d"C:\Users\Admin\AppData\Local\Temp\2026-06-03_4c99e7df3001d894a3e73b47eee46311_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:3292
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • System Location Discovery: System Language Discovery
      PID:5888
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3292 -s 556
      2⤵
      • Program crash
      PID:3624
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 3292 -ip 3292
    1⤵
      PID:4216
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 516 -p 2984 -ip 2984
      1⤵
        PID:4212

      Network

            MITRE ATT&CK Enterprise v16

            Replay Monitor

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            Downloads

            oinlgjgi.exe

            • Path C:\Users\Admin\AppData\Local\Temp\oinlgjgi.exe
            • Size 13.8MB
            • SHA256 91c4ebcbd77f0e90ff0a595664e4a4d6ef13b08126962ea31722f20a38d69330
            • MD5 SHA1 SHA512 SSDEEP TLSH

            memory/2984-2-0x0000000002830000-0x0000000002843000-memory.dmp

            memory/2984-1-0x0000000002880000-0x0000000002980000-memory.dmp

            memory/2984-11-0x0000000002830000-0x0000000002843000-memory.dmp

            memory/5888-7-0x00000000004B0000-0x00000000004C5000-memory.dmp

            memory/5888-12-0x00000000004B0000-0x00000000004C5000-memory.dmp

            memory/5888-13-0x00000000004B0000-0x00000000004C5000-memory.dmp