Analysis

  • max time kernel
    146s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05/09/2024, 05:47

General

  • Target
    b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf.exe
  • Size 11.6MB
  • Sample240905-gg93taveph
  • SHA256 b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf
  • MD5 SHA1 SHA512 SSDEEP

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.

  • 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.

  • 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\b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf.exe
    "C:\Users\Admin\AppData\Local\Temp\b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2012
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ofvrhhjn\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5088
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gnmzhhpt.exe" C:\Windows\SysWOW64\ofvrhhjn\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3044
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create ofvrhhjn binPath= "C:\Windows\SysWOW64\ofvrhhjn\gnmzhhpt.exe /d\"C:\Users\Admin\AppData\Local\Temp\b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:220
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description ofvrhhjn "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1844
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start ofvrhhjn
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3060
    • 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:4912
  • C:\Windows\SysWOW64\ofvrhhjn\gnmzhhpt.exe
    C:\Windows\SysWOW64\ofvrhhjn\gnmzhhpt.exe /d"C:\Users\Admin\AppData\Local\Temp\b84685b177c7bbd6e54c0cd81f5ac41c02e2c77a400b71a830636f93a686eaaf.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4140
    • 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:1576

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        gnmzhhpt.exe

        • Path C:\Users\Admin\AppData\Local\Temp\gnmzhhpt.exe
        • Size 12.0MB
        • SHA256 6c526eae6ec97b59821f408738a9933469f841b51374ac482e640325f289cf93
        • MD5 SHA1 SHA512 SSDEEP

        memory/1576-46-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/1576-37-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/1576-22-0x0000000002E00000-0x000000000300F000-memory.dmp

        memory/1576-32-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/1576-24-0x0000000002E00000-0x000000000300F000-memory.dmp

        memory/1576-25-0x0000000002530000-0x0000000002536000-memory.dmp

        memory/1576-55-0x0000000007D80000-0x000000000818B000-memory.dmp

        memory/1576-28-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/1576-31-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/1576-14-0x0000000000F80000-0x0000000000F95000-memory.dmp

        memory/1576-33-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/1576-17-0x0000000000F80000-0x0000000000F95000-memory.dmp

        memory/1576-19-0x0000000000F80000-0x0000000000F95000-memory.dmp

        memory/1576-34-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/1576-56-0x00000000025E0000-0x00000000025E7000-memory.dmp

        memory/1576-52-0x0000000007D80000-0x000000000818B000-memory.dmp

        memory/1576-35-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/1576-48-0x00000000025D0000-0x00000000025D5000-memory.dmp

        memory/1576-36-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/1576-51-0x00000000025D0000-0x00000000025D5000-memory.dmp

        memory/1576-42-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/1576-44-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/1576-43-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/1576-45-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/1576-41-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/1576-40-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/1576-39-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/1576-38-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/1576-47-0x0000000002540000-0x0000000002550000-memory.dmp

        memory/2012-3-0x0000000000400000-0x0000000000415000-memory.dmp

        memory/2012-1-0x0000000000840000-0x0000000000940000-memory.dmp

        memory/2012-7-0x0000000000400000-0x00000000005FE000-memory.dmp

        memory/2012-8-0x0000000002340000-0x0000000002353000-memory.dmp

        memory/2012-9-0x0000000000400000-0x0000000000415000-memory.dmp

        memory/2012-2-0x0000000002340000-0x0000000002353000-memory.dmp

        memory/4140-18-0x0000000000400000-0x00000000005FE000-memory.dmp

        memory/4140-12-0x0000000000400000-0x00000000005FE000-memory.dmp

        memory/4140-13-0x0000000000400000-0x00000000005FE000-memory.dmp

        memory/4140-11-0x0000000000400000-0x00000000005FE000-memory.dmp