Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260911-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260911-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    04/11/2026, 01:52

General

  • Target
    2026-11-03_f9297f57e7432c4de89cb791e9083c34_amadey_elex_remcos_smoke-loader.exe
  • Size 12.6MB
  • Sample261104-cac3aacb52
  • SHA256 9e28ad096644f303885a42fa9393ef0666dc2d36935cb85c4fee62eb9fcb2e7b
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • tofsee

C2
  • quadoil.ru

  • lakeflex.ru

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.

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Creates new service(s) 2 TTPs
  • Deletes itself 1 TTPs 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.

  • Executes a command shell one-liner 1 TTPs 2 IoCs

    Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

  • 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\2026-11-03_f9297f57e7432c4de89cb791e9083c34_amadey_elex_remcos_smoke-loader.exe
    "C:\Users\Admin\AppData\Local\Temp\2026-11-03_f9297f57e7432c4de89cb791e9083c34_amadey_elex_remcos_smoke-loader.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:912
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cihnkxwq\
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      PID:1144
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gicrnjfw.exe" C:\Windows\SysWOW64\cihnkxwq\
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      PID:1496
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create cihnkxwq binPath= "C:\Windows\SysWOW64\cihnkxwq\gicrnjfw.exe /d\"C:\Users\Admin\AppData\Local\Temp\2026-11-03_f9297f57e7432c4de89cb791e9083c34_amadey_elex_remcos_smoke-loader.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:508
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description cihnkxwq "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4264
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start cihnkxwq
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:720
    • 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:116
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 912 -s 1044
      2⤵
      • Program crash
      PID:4140
  • C:\Windows\SysWOW64\cihnkxwq\gicrnjfw.exe
    C:\Windows\SysWOW64\cihnkxwq\gicrnjfw.exe /d"C:\Users\Admin\AppData\Local\Temp\2026-11-03_f9297f57e7432c4de89cb791e9083c34_amadey_elex_remcos_smoke-loader.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2844
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • System Location Discovery: System Language Discovery
      PID:4056
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2844 -s 532
      2⤵
      • Program crash
      PID:2528
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 912 -ip 912
    1⤵
      PID:2980
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 2844 -ip 2844
      1⤵
        PID:2900

      Network

            MITRE ATT&CK Enterprise v16

            Replay Monitor

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            Downloads

            gicrnjfw.exe

            • Path C:\Users\Admin\AppData\Local\Temp\gicrnjfw.exe
            • Size 13.4MB
            • SHA256 67e7bdb65efb3f6c8b0ae218fca0960d109fcf66fd51d6c3a47e469889264864
            • MD5 SHA1 SHA512 SSDEEP TLSH

            memory/912-2-0x00000000001D0000-0x00000000001E3000-memory.dmp

            memory/912-1-0x0000000002CE0000-0x0000000002DE0000-memory.dmp

            memory/912-8-0x00000000001D0000-0x00000000001E3000-memory.dmp

            memory/912-7-0x0000000000400000-0x0000000002B4E000-memory.dmp

            memory/2844-14-0x0000000000400000-0x0000000002B4E000-memory.dmp

            memory/4056-10-0x0000000000FA0000-0x0000000000FB5000-memory.dmp

            memory/4056-12-0x0000000000FA0000-0x0000000000FB5000-memory.dmp

            memory/4056-13-0x0000000000FA0000-0x0000000000FB5000-memory.dmp