Analysis

  • max time kernel
    149s
  • max time network
    154s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    28/05/2026, 03:08

General

  • Target
    2026-05-28_fdd13f9d59a6ca1d232fec731d890fd0_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe
  • Size 13.9MB
  • Sample260528-dnbxtags6w
  • SHA256 99d5bc3ec48b6dd18121f8ecccfe1d60e6360d9537d2db8096953888e6472c80
  • 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\2026-05-28_fdd13f9d59a6ca1d232fec731d890fd0_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe
    "C:\Users\Admin\AppData\Local\Temp\2026-05-28_fdd13f9d59a6ca1d232fec731d890fd0_amadey_elex_njrat_remcos_rhadamanthys_smoke-loader_stealc.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4116
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\knokwguf\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4108
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\oinlgjgi.exe" C:\Windows\SysWOW64\knokwguf\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5772
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create knokwguf binPath= "C:\Windows\SysWOW64\knokwguf\oinlgjgi.exe /d\"C:\Users\Admin\AppData\Local\Temp\2026-05-28_fdd13f9d59a6ca1d232fec731d890fd0_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:4364
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description knokwguf "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2624
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start knokwguf
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2504
    • 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:3972
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4116 -s 1228
      2⤵
      • Program crash
      PID:5884
  • C:\Windows\SysWOW64\knokwguf\oinlgjgi.exe
    C:\Windows\SysWOW64\knokwguf\oinlgjgi.exe /d"C:\Users\Admin\AppData\Local\Temp\2026-05-28_fdd13f9d59a6ca1d232fec731d890fd0_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:2340
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • System Location Discovery: System Language Discovery
      PID:4460
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2340 -s 544
      2⤵
      • Program crash
      PID:492
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 2340 -ip 2340
    1⤵
      PID:4152
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4116 -ip 4116
      1⤵
        PID:652

      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 12.5MB
            • SHA256 60153ffa6d1e13c781954c14b85661a62bd5eecfaeeed0db89d39ca467e99e57
            • MD5 SHA1 SHA512 SSDEEP TLSH

            memory/4116-2-0x00000000026C0000-0x00000000026D3000-memory.dmp

            memory/4116-1-0x00000000027E0000-0x00000000028E0000-memory.dmp

            memory/4116-11-0x00000000026C0000-0x00000000026D3000-memory.dmp

            memory/4460-7-0x0000000000690000-0x00000000006A5000-memory.dmp

            memory/4460-12-0x0000000000690000-0x00000000006A5000-memory.dmp

            memory/4460-13-0x0000000000690000-0x00000000006A5000-memory.dmp