Analysis

  • max time kernel
    149s
  • max time network
    158s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240704-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240704-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07/07/2024, 01:19

General

  • Target
    f37f32eb1c859541773f55297fb1e05bbfc2874851fc7bbd4e185d3a6a1b6583.exe
  • Size 229KB
  • Sample240707-bpvefasbkf
  • SHA256 f37f32eb1c859541773f55297fb1e05bbfc2874851fc7bbd4e185d3a6a1b6583
  • 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.

  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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.

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f37f32eb1c859541773f55297fb1e05bbfc2874851fc7bbd4e185d3a6a1b6583.exe
    "C:\Users\Admin\AppData\Local\Temp\f37f32eb1c859541773f55297fb1e05bbfc2874851fc7bbd4e185d3a6a1b6583.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1792
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vcigibss\
      2⤵
        PID:2496
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bipshvoy.exe" C:\Windows\SysWOW64\vcigibss\
        2⤵
          PID:1672
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create vcigibss binPath= "C:\Windows\SysWOW64\vcigibss\bipshvoy.exe /d\"C:\Users\Admin\AppData\Local\Temp\f37f32eb1c859541773f55297fb1e05bbfc2874851fc7bbd4e185d3a6a1b6583.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:5000
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description vcigibss "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4552
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start vcigibss
          2⤵
          • Launches sc.exe
          PID:4388
        • 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
          PID:2808
      • C:\Windows\SysWOW64\vcigibss\bipshvoy.exe
        C:\Windows\SysWOW64\vcigibss\bipshvoy.exe /d"C:\Users\Admin\AppData\Local\Temp\f37f32eb1c859541773f55297fb1e05bbfc2874851fc7bbd4e185d3a6a1b6583.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:388
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:3468

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            bipshvoy.exe

            • Path C:\Users\Admin\AppData\Local\Temp\bipshvoy.exe
            • Size 10.1MB
            • SHA256 e8427b1225a16a95be6f4bf8aacd1e842b7360c9682d3dee49633ad8aa973416
            • MD5 SHA1 SHA512 SSDEEP

            memory/388-11-0x0000000000400000-0x0000000002820000-memory.dmp

            memory/1792-3-0x0000000000400000-0x0000000000415000-memory.dmp

            memory/1792-2-0x00000000029C0000-0x00000000029D3000-memory.dmp

            memory/1792-1-0x00000000029E0000-0x0000000002AE0000-memory.dmp

            memory/1792-62-0x0000000000400000-0x0000000000415000-memory.dmp

            memory/1792-10-0x0000000000400000-0x0000000002820000-memory.dmp

            memory/1792-60-0x00000000029E0000-0x0000000002AE0000-memory.dmp

            memory/1792-61-0x00000000029C0000-0x00000000029D3000-memory.dmp

            memory/3468-41-0x0000000002590000-0x00000000025A0000-memory.dmp

            memory/3468-34-0x0000000002590000-0x00000000025A0000-memory.dmp

            memory/3468-53-0x00000000025F0000-0x00000000025F7000-memory.dmp

            memory/3468-49-0x0000000007E00000-0x000000000820B000-memory.dmp

            memory/3468-48-0x00000000025E0000-0x00000000025E5000-memory.dmp

            memory/3468-45-0x00000000025E0000-0x00000000025E5000-memory.dmp

            memory/3468-44-0x0000000002590000-0x00000000025A0000-memory.dmp

            memory/3468-43-0x0000000002590000-0x00000000025A0000-memory.dmp

            memory/3468-42-0x0000000002590000-0x00000000025A0000-memory.dmp

            memory/3468-52-0x0000000007E00000-0x000000000820B000-memory.dmp

            memory/3468-40-0x0000000002590000-0x00000000025A0000-memory.dmp

            memory/3468-39-0x0000000002590000-0x00000000025A0000-memory.dmp

            memory/3468-37-0x0000000002590000-0x00000000025A0000-memory.dmp

            memory/3468-35-0x0000000002590000-0x00000000025A0000-memory.dmp

            memory/3468-36-0x0000000002590000-0x00000000025A0000-memory.dmp

            memory/3468-38-0x0000000002590000-0x00000000025A0000-memory.dmp

            memory/3468-21-0x0000000002E00000-0x000000000300F000-memory.dmp

            memory/3468-33-0x0000000002590000-0x00000000025A0000-memory.dmp

            memory/3468-32-0x0000000002590000-0x00000000025A0000-memory.dmp

            memory/3468-31-0x0000000002590000-0x00000000025A0000-memory.dmp

            memory/3468-30-0x0000000002590000-0x00000000025A0000-memory.dmp

            memory/3468-29-0x0000000002590000-0x00000000025A0000-memory.dmp

            memory/3468-28-0x0000000002590000-0x00000000025A0000-memory.dmp

            memory/3468-25-0x0000000002590000-0x00000000025A0000-memory.dmp

            memory/3468-22-0x0000000002580000-0x0000000002586000-memory.dmp

            memory/3468-18-0x0000000002E00000-0x000000000300F000-memory.dmp

            memory/3468-13-0x0000000000FD0000-0x0000000000FE5000-memory.dmp

            memory/3468-12-0x0000000000FD0000-0x0000000000FE5000-memory.dmp

            memory/3468-8-0x0000000000FD0000-0x0000000000FE5000-memory.dmp