Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20250217-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20250217-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12/03/2025, 18:44

General

  • Target

    ef62b5a6474.exe

  • Size

    259KB

  • MD5

    0ba4447a07a7c2c63cfe7aa69173ab6a

  • SHA1

    00273726672ded3869e15e24e09ee1053f547f0f

  • SHA256

    7c3bd96cd755ebe1e700c2b578cf83e88d10ce2529213c5bccf2def62b5a6474

  • SHA512

    0b169df73780dfe8d3e5b4c1c298e51e2cab756482a6f6cb439ddae6e66f4c918daa8aa3f059820b2639651e59bc766dc506df654d218d995e843b5f343ebd4d

  • SSDEEP

    3072:cypgerGfQDgLG96SFeQYWxK14YrLLKzxR/yrhIfD1lBqlb2PDFgvRs5xbBo2+:1xDgLzSHYKg4Yr0bTlm6Zto

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Tofsee family
  • Creates new service(s) 2 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • 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.

  • 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 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ef62b5a6474.exe
    "C:\Users\Admin\AppData\Local\Temp\ef62b5a6474.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3472
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\whlfwof\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2264
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\crjqvtyq.exe" C:\Windows\SysWOW64\whlfwof\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1764
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create whlfwof binPath= "C:\Windows\SysWOW64\whlfwof\crjqvtyq.exe /d\"C:\Users\Admin\AppData\Local\Temp\ef62b5a6474.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4524
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description whlfwof "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4852
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start whlfwof
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4508
    • 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:2668
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3472 -s 1044
      2⤵
      • Program crash
      PID:1428
  • C:\Windows\SysWOW64\whlfwof\crjqvtyq.exe
    C:\Windows\SysWOW64\whlfwof\crjqvtyq.exe /d"C:\Users\Admin\AppData\Local\Temp\ef62b5a6474.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2904
    • 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:2840
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2904 -s 512
      2⤵
      • Program crash
      PID:3484
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2904 -ip 2904
    1⤵
      PID:5952
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 3472 -ip 3472
      1⤵
        PID:2240

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Temp\crjqvtyq.exe

        Filesize

        10.8MB

        MD5

        2bb129ee69e0ca8419145a438cad9f91

        SHA1

        4ed2d8174cb8fd5a16bea98ae95e813b98d247b0

        SHA256

        78cb21dafaf5746b45386bb50cabb6e9be97932e2d74be37baa6746094b03119

        SHA512

        d0f75a48beb1eb4f972f6c360d0dac03c7bdeb9da773d7c158316b464ff6ac947141417bd202022a500557576f5e691ac109465ac470d00a79d68321e5f77979

      • memory/2840-39-0x0000000002E20000-0x0000000002E30000-memory.dmp

        Filesize

        64KB

      • memory/2840-40-0x0000000002E20000-0x0000000002E30000-memory.dmp

        Filesize

        64KB

      • memory/2840-58-0x0000000008050000-0x0000000008057000-memory.dmp

        Filesize

        28KB

      • memory/2840-9-0x0000000000D60000-0x0000000000D75000-memory.dmp

        Filesize

        84KB

      • memory/2840-14-0x0000000000D60000-0x0000000000D75000-memory.dmp

        Filesize

        84KB

      • memory/2840-26-0x0000000002C00000-0x0000000002E0F000-memory.dmp

        Filesize

        2.1MB

      • memory/2840-27-0x0000000002E10000-0x0000000002E16000-memory.dmp

        Filesize

        24KB

      • memory/2840-30-0x0000000002E20000-0x0000000002E30000-memory.dmp

        Filesize

        64KB

      • memory/2840-33-0x0000000002E20000-0x0000000002E30000-memory.dmp

        Filesize

        64KB

      • memory/2840-34-0x0000000002E20000-0x0000000002E30000-memory.dmp

        Filesize

        64KB

      • memory/2840-35-0x0000000002E20000-0x0000000002E30000-memory.dmp

        Filesize

        64KB

      • memory/2840-19-0x0000000000D60000-0x0000000000D75000-memory.dmp

        Filesize

        84KB

      • memory/2840-20-0x0000000000D60000-0x0000000000D75000-memory.dmp

        Filesize

        84KB

      • memory/2840-22-0x0000000000D60000-0x0000000000D75000-memory.dmp

        Filesize

        84KB

      • memory/2840-50-0x0000000002FF0000-0x0000000002FF5000-memory.dmp

        Filesize

        20KB

      • memory/2840-24-0x0000000002C00000-0x0000000002E0F000-memory.dmp

        Filesize

        2.1MB

      • memory/2840-54-0x0000000007B00000-0x0000000007F0B000-memory.dmp

        Filesize

        4.0MB

      • memory/2840-57-0x0000000007B00000-0x0000000007F0B000-memory.dmp

        Filesize

        4.0MB

      • memory/2840-36-0x0000000002E20000-0x0000000002E30000-memory.dmp

        Filesize

        64KB

      • memory/2840-46-0x0000000002E20000-0x0000000002E30000-memory.dmp

        Filesize

        64KB

      • memory/2840-43-0x0000000002E20000-0x0000000002E30000-memory.dmp

        Filesize

        64KB

      • memory/2840-48-0x0000000002E20000-0x0000000002E30000-memory.dmp

        Filesize

        64KB

      • memory/2840-47-0x0000000002E20000-0x0000000002E30000-memory.dmp

        Filesize

        64KB

      • memory/2840-45-0x0000000002E20000-0x0000000002E30000-memory.dmp

        Filesize

        64KB

      • memory/2840-44-0x0000000002E20000-0x0000000002E30000-memory.dmp

        Filesize

        64KB

      • memory/2840-49-0x0000000002E20000-0x0000000002E30000-memory.dmp

        Filesize

        64KB

      • memory/2840-42-0x0000000002E20000-0x0000000002E30000-memory.dmp

        Filesize

        64KB

      • memory/2840-41-0x0000000002E20000-0x0000000002E30000-memory.dmp

        Filesize

        64KB

      • memory/2840-53-0x0000000002FF0000-0x0000000002FF5000-memory.dmp

        Filesize

        20KB

      • memory/2840-37-0x0000000002E20000-0x0000000002E30000-memory.dmp

        Filesize

        64KB

      • memory/2840-38-0x0000000002E20000-0x0000000002E30000-memory.dmp

        Filesize

        64KB

      • memory/2904-8-0x0000000000400000-0x0000000000704000-memory.dmp

        Filesize

        3.0MB

      • memory/2904-13-0x0000000000400000-0x0000000000704000-memory.dmp

        Filesize

        3.0MB

      • memory/2904-11-0x0000000000400000-0x0000000000704000-memory.dmp

        Filesize

        3.0MB

      • memory/3472-2-0x0000000000960000-0x0000000000973000-memory.dmp

        Filesize

        76KB

      • memory/3472-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3472-16-0x0000000000400000-0x0000000000704000-memory.dmp

        Filesize

        3.0MB

      • memory/3472-17-0x0000000000960000-0x0000000000973000-memory.dmp

        Filesize

        76KB

      • memory/3472-18-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3472-1-0x0000000000980000-0x0000000000A80000-memory.dmp

        Filesize

        1024KB