Analysis

  • max time kernel
    149s
  • max time network
    155s
  • platform
    windows7_x64
  • resource
    win7-20240704-en
  • resource tags

    arch:x64arch:x86image:win7-20240704-enlocale:en-usos:windows7-x64system
  • submitted
    21-07-2024 08:57

General

  • Target

    881e0d77937dfe04295b394212e9004db0bbad441ed40fab38a8a48216020bf7.exe

  • Size

    240KB

  • MD5

    4000d4183cb34633077012e5853c52e0

  • SHA1

    8a7816c227ebbd7ad29299f7b4caba89e32dc522

  • SHA256

    881e0d77937dfe04295b394212e9004db0bbad441ed40fab38a8a48216020bf7

  • SHA512

    375797bfca1bf017796f298943823a59160d9f932ffb6ef77e9b2da015bb7585c531964a829bcfc906a7f3ae6da1c64c6bc1dce92e99c925e5ff5dc8dd1628e4

  • SSDEEP

    3072:AdYyTQsx4c5U5Mzyy76jm5y2zvXpxgctPj1QfaYClo/cXqJBgNaCa:AdYcxDuCy8p5hpdKSUFcZ

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.

  • Windows security bypass 2 TTPs 1 IoCs
  • Creates new service(s) 2 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Looks up external IP address via web service 1 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 7 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\881e0d77937dfe04295b394212e9004db0bbad441ed40fab38a8a48216020bf7.exe
    "C:\Users\Admin\AppData\Local\Temp\881e0d77937dfe04295b394212e9004db0bbad441ed40fab38a8a48216020bf7.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2164
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xtpfthbr\
      2⤵
        PID:2592
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\auzxsvsu.exe" C:\Windows\SysWOW64\xtpfthbr\
        2⤵
          PID:2156
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create xtpfthbr binPath= "C:\Windows\SysWOW64\xtpfthbr\auzxsvsu.exe /d\"C:\Users\Admin\AppData\Local\Temp\881e0d77937dfe04295b394212e9004db0bbad441ed40fab38a8a48216020bf7.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2904
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description xtpfthbr "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2472
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start xtpfthbr
          2⤵
          • Launches sc.exe
          PID:2852
        • 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:2784
      • C:\Windows\SysWOW64\xtpfthbr\auzxsvsu.exe
        C:\Windows\SysWOW64\xtpfthbr\auzxsvsu.exe /d"C:\Users\Admin\AppData\Local\Temp\881e0d77937dfe04295b394212e9004db0bbad441ed40fab38a8a48216020bf7.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2636
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2796

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\auzxsvsu.exe
        Filesize

        11.9MB

        MD5

        aca7814b394962208fa67473a35ff0f6

        SHA1

        ceb3fd94bca175f011b861638789fcac535ca65a

        SHA256

        79540ce25a4e50783f5d494315417f5d827cc697e9ad517941430f893102211f

        SHA512

        fbf23e4db9864c29a892b976f3663802382da8f376435195192ad9f52d2ac4b812853189a5d7d42c26a234e7b441a631090333f98d376f70dab210d0cd874142

      • memory/2164-2-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/2164-3-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/2164-9-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/2164-8-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/2164-6-0x0000000000400000-0x0000000002084000-memory.dmp
        Filesize

        28.5MB

      • memory/2164-1-0x00000000024F0000-0x00000000025F0000-memory.dmp
        Filesize

        1024KB

      • memory/2636-17-0x0000000000400000-0x0000000002084000-memory.dmp
        Filesize

        28.5MB

      • memory/2796-38-0x00000000002A0000-0x00000000002B0000-memory.dmp
        Filesize

        64KB

      • memory/2796-45-0x00000000002A0000-0x00000000002B0000-memory.dmp
        Filesize

        64KB

      • memory/2796-16-0x0000000000110000-0x0000000000125000-memory.dmp
        Filesize

        84KB

      • memory/2796-18-0x0000000000110000-0x0000000000125000-memory.dmp
        Filesize

        84KB

      • memory/2796-11-0x0000000000110000-0x0000000000125000-memory.dmp
        Filesize

        84KB

      • memory/2796-23-0x0000000001990000-0x0000000001B9F000-memory.dmp
        Filesize

        2.1MB

      • memory/2796-24-0x0000000000080000-0x0000000000086000-memory.dmp
        Filesize

        24KB

      • memory/2796-27-0x00000000002A0000-0x00000000002B0000-memory.dmp
        Filesize

        64KB

      • memory/2796-20-0x0000000001990000-0x0000000001B9F000-memory.dmp
        Filesize

        2.1MB

      • memory/2796-30-0x00000000002A0000-0x00000000002B0000-memory.dmp
        Filesize

        64KB

      • memory/2796-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2796-36-0x00000000002A0000-0x00000000002B0000-memory.dmp
        Filesize

        64KB

      • memory/2796-47-0x00000000002B0000-0x00000000002B5000-memory.dmp
        Filesize

        20KB

      • memory/2796-50-0x00000000002B0000-0x00000000002B5000-memory.dmp
        Filesize

        20KB

      • memory/2796-46-0x00000000002A0000-0x00000000002B0000-memory.dmp
        Filesize

        64KB

      • memory/2796-14-0x0000000000110000-0x0000000000125000-memory.dmp
        Filesize

        84KB

      • memory/2796-44-0x00000000002A0000-0x00000000002B0000-memory.dmp
        Filesize

        64KB

      • memory/2796-43-0x00000000002A0000-0x00000000002B0000-memory.dmp
        Filesize

        64KB

      • memory/2796-42-0x00000000002A0000-0x00000000002B0000-memory.dmp
        Filesize

        64KB

      • memory/2796-41-0x00000000002A0000-0x00000000002B0000-memory.dmp
        Filesize

        64KB

      • memory/2796-40-0x00000000002A0000-0x00000000002B0000-memory.dmp
        Filesize

        64KB

      • memory/2796-39-0x00000000002A0000-0x00000000002B0000-memory.dmp
        Filesize

        64KB

      • memory/2796-37-0x00000000002A0000-0x00000000002B0000-memory.dmp
        Filesize

        64KB

      • memory/2796-35-0x00000000002A0000-0x00000000002B0000-memory.dmp
        Filesize

        64KB

      • memory/2796-34-0x00000000002A0000-0x00000000002B0000-memory.dmp
        Filesize

        64KB

      • memory/2796-33-0x00000000002A0000-0x00000000002B0000-memory.dmp
        Filesize

        64KB

      • memory/2796-32-0x00000000002A0000-0x00000000002B0000-memory.dmp
        Filesize

        64KB

      • memory/2796-31-0x00000000002A0000-0x00000000002B0000-memory.dmp
        Filesize

        64KB

      • memory/2796-54-0x00000000054C0000-0x00000000058CB000-memory.dmp
        Filesize

        4.0MB

      • memory/2796-55-0x00000000003B0000-0x00000000003B7000-memory.dmp
        Filesize

        28KB

      • memory/2796-52-0x00000000054C0000-0x00000000058CB000-memory.dmp
        Filesize

        4.0MB