Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    31/08/2026, 14:26

General

  • Target
    2026-08-31_d0d7a2c30ad8b9cc558c0fa14faef968_amadey_elex_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe
  • Size 13.1MB
  • Sample260831-rr89datdre
  • SHA256 76aa069f71b3730e900caf4baaf9fead8beab16cded7f54a94b218e836f42d25
  • 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.

  • 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 IoCs
  • Executes dropped EXE 1 IoCs
  • Stops running service(s) 4 TTPs
  • Drops file in System32 directory 2 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.

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2026-08-31_d0d7a2c30ad8b9cc558c0fa14faef968_amadey_elex_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe
    "C:\Users\Admin\AppData\Local\Temp\2026-08-31_d0d7a2c30ad8b9cc558c0fa14faef968_amadey_elex_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2236
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ucuoruei\
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      PID:3096
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ybyrikeu.exe" C:\Windows\SysWOW64\ucuoruei\
      2⤵
      • Executes a command shell one-liner
      • System Location Discovery: System Language Discovery
      PID:828
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create ucuoruei binPath= "C:\Windows\SysWOW64\ucuoruei\ybyrikeu.exe /d\"C:\Users\Admin\AppData\Local\Temp\2026-08-31_d0d7a2c30ad8b9cc558c0fa14faef968_amadey_elex_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1480
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description ucuoruei "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3516
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start ucuoruei
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4372
    • 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:2452
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2236 -s 1044
      2⤵
      • Program crash
      PID:1936
  • C:\Windows\SysWOW64\ucuoruei\ybyrikeu.exe
    C:\Windows\SysWOW64\ucuoruei\ybyrikeu.exe /d"C:\Users\Admin\AppData\Local\Temp\2026-08-31_d0d7a2c30ad8b9cc558c0fa14faef968_amadey_elex_rhadamanthys_smoke-loader_stealc_stop_tofsee.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:964
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:5088
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 964 -s 508
      2⤵
      • Program crash
      PID:1844
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2236 -ip 2236
    1⤵
      PID:968
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 556 -p 964 -ip 964
      1⤵
        PID:920

      Network

            MITRE ATT&CK Enterprise v16

            Replay Monitor

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            Downloads

            ybyrikeu.exe

            • Path C:\Users\Admin\AppData\Local\Temp\ybyrikeu.exe
            • Size 10.3MB
            • SHA256 1305f53d2364be7292b98a9f6e94fc9060a177ec5f6b84aa871fbc4753b088c2
            • MD5 SHA1 SHA512 SSDEEP TLSH

            memory/964-17-0x0000000000400000-0x000000000229F000-memory.dmp

            memory/964-8-0x0000000000400000-0x000000000229F000-memory.dmp

            memory/2236-2-0x00000000025E0000-0x00000000026E0000-memory.dmp

            memory/2236-3-0x0000000002500000-0x0000000002513000-memory.dmp

            memory/2236-6-0x0000000000400000-0x000000000229F000-memory.dmp

            memory/2236-10-0x0000000002500000-0x0000000002513000-memory.dmp

            memory/2236-9-0x0000000000400000-0x000000000229F000-memory.dmp

            memory/2236-0-0x0000000000400000-0x000000000229F000-memory.dmp

            memory/5088-44-0x00000000025B0000-0x00000000025C0000-memory.dmp

            memory/5088-37-0x00000000025B0000-0x00000000025C0000-memory.dmp

            memory/5088-14-0x0000000000F60000-0x0000000000F75000-memory.dmp

            memory/5088-20-0x0000000003000000-0x000000000320F000-memory.dmp

            memory/5088-26-0x00000000025B0000-0x00000000025C0000-memory.dmp

            memory/5088-54-0x00000000035E0000-0x00000000035E7000-memory.dmp

            memory/5088-50-0x0000000008000000-0x000000000840B000-memory.dmp

            memory/5088-49-0x00000000035D0000-0x00000000035D5000-memory.dmp

            memory/5088-45-0x00000000025B0000-0x00000000025C0000-memory.dmp

            memory/5088-12-0x0000000000F60000-0x0000000000F75000-memory.dmp

            memory/5088-43-0x00000000025B0000-0x00000000025C0000-memory.dmp

            memory/5088-42-0x00000000025B0000-0x00000000025C0000-memory.dmp

            memory/5088-40-0x00000000025B0000-0x00000000025C0000-memory.dmp

            memory/5088-39-0x00000000025B0000-0x00000000025C0000-memory.dmp

            memory/5088-38-0x00000000025B0000-0x00000000025C0000-memory.dmp

            memory/5088-15-0x0000000000F60000-0x0000000000F75000-memory.dmp

            memory/5088-35-0x00000000025B0000-0x00000000025C0000-memory.dmp

            memory/5088-36-0x00000000025B0000-0x00000000025C0000-memory.dmp

            memory/5088-34-0x00000000025B0000-0x00000000025C0000-memory.dmp

            memory/5088-33-0x00000000025B0000-0x00000000025C0000-memory.dmp

            memory/5088-32-0x00000000025B0000-0x00000000025C0000-memory.dmp

            memory/5088-31-0x00000000025B0000-0x00000000025C0000-memory.dmp

            memory/5088-30-0x00000000025B0000-0x00000000025C0000-memory.dmp

            memory/5088-29-0x00000000025B0000-0x00000000025C0000-memory.dmp

            memory/5088-23-0x00000000025A0000-0x00000000025A6000-memory.dmp

            memory/5088-53-0x0000000008000000-0x000000000840B000-memory.dmp

            memory/5088-22-0x0000000003000000-0x000000000320F000-memory.dmp

            memory/5088-46-0x00000000035D0000-0x00000000035D5000-memory.dmp

            memory/5088-41-0x00000000025B0000-0x00000000025C0000-memory.dmp