Analysis

  • max time kernel
    148s
  • max time network
    150s
  • 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, 18:50

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:2684
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bissokex\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2940
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\yssknxbn.exe" C:\Windows\SysWOW64\bissokex\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3224
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create bissokex binPath= "C:\Windows\SysWOW64\bissokex\yssknxbn.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:452
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description bissokex "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1472
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start bissokex
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1772
    • 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:3484
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2684 -s 1036
      2⤵
      • Program crash
      PID:2896
  • C:\Windows\SysWOW64\bissokex\yssknxbn.exe
    C:\Windows\SysWOW64\bissokex\yssknxbn.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:1352
    • 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:3816
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1352 -s 520
      2⤵
      • Program crash
      PID:4008
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1352 -ip 1352
    1⤵
      PID:2844
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 2684 -ip 2684
      1⤵
        PID:2408

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        11.1MB

        MD5

        6717d21b8e4ab2037e882231f2999867

        SHA1

        a94d1067af9f7e21f87a22e6515036a5df523c69

        SHA256

        ebcea429104034292650a048e3b0bc66aeebdfc3a84948179a7e657f8b9a37be

        SHA512

        f8af8d110756b49f8c6f84d6350ac633fafc4a60434d08af710279e0cf39a9c5b6a5aea6df3437e2ab54262a24113c0d05a6e4eceb3c87af007a5b0ceffc37eb

      • memory/1352-8-0x0000000000400000-0x0000000000704000-memory.dmp

        Filesize

        3.0MB

      • memory/1352-9-0x0000000000400000-0x0000000000704000-memory.dmp

        Filesize

        3.0MB

      • memory/1352-15-0x0000000000400000-0x0000000000704000-memory.dmp

        Filesize

        3.0MB

      • memory/2684-17-0x00000000007A0000-0x00000000007B3000-memory.dmp

        Filesize

        76KB

      • memory/2684-2-0x00000000007A0000-0x00000000007B3000-memory.dmp

        Filesize

        76KB

      • memory/2684-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2684-1-0x00000000007D0000-0x00000000008D0000-memory.dmp

        Filesize

        1024KB

      • memory/2684-16-0x0000000000400000-0x0000000000704000-memory.dmp

        Filesize

        3.0MB

      • memory/2684-18-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3816-51-0x00000000023D0000-0x00000000023D5000-memory.dmp

        Filesize

        20KB

      • memory/3816-45-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/3816-19-0x0000000000D90000-0x0000000000DA5000-memory.dmp

        Filesize

        84KB

      • memory/3816-20-0x0000000000D90000-0x0000000000DA5000-memory.dmp

        Filesize

        84KB

      • memory/3816-22-0x0000000000D90000-0x0000000000DA5000-memory.dmp

        Filesize

        84KB

      • memory/3816-33-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/3816-53-0x00000000023D0000-0x00000000023D5000-memory.dmp

        Filesize

        20KB

      • memory/3816-54-0x0000000007B80000-0x0000000007F8B000-memory.dmp

        Filesize

        4.0MB

      • memory/3816-58-0x00000000023E0000-0x00000000023E7000-memory.dmp

        Filesize

        28KB

      • memory/3816-57-0x0000000007B80000-0x0000000007F8B000-memory.dmp

        Filesize

        4.0MB

      • memory/3816-13-0x0000000000D90000-0x0000000000DA5000-memory.dmp

        Filesize

        84KB

      • memory/3816-49-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/3816-48-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/3816-47-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/3816-46-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/3816-10-0x0000000000D90000-0x0000000000DA5000-memory.dmp

        Filesize

        84KB

      • memory/3816-44-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/3816-43-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/3816-42-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/3816-41-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/3816-40-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/3816-39-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/3816-38-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/3816-37-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/3816-36-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/3816-35-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/3816-34-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/3816-30-0x0000000002340000-0x0000000002350000-memory.dmp

        Filesize

        64KB

      • memory/3816-27-0x0000000002330000-0x0000000002336000-memory.dmp

        Filesize

        24KB

      • memory/3816-26-0x0000000002C00000-0x0000000002E0F000-memory.dmp

        Filesize

        2.1MB

      • memory/3816-24-0x0000000002C00000-0x0000000002E0F000-memory.dmp

        Filesize

        2.1MB