Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7-20240508-en
  • resource tags

    arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
  • submitted
    29-05-2024 09:17

General

  • Target

    4336baec00605852af5cc8bd1d16062d9284c49c13a2de7943526d338c2365b7.exe

  • Size

    13.8MB

  • MD5

    c4582eeb3067dac7496b9bd05783574f

  • SHA1

    a4ece6f28cf4b6e61f478e3a191d5295884517dd

  • SHA256

    4336baec00605852af5cc8bd1d16062d9284c49c13a2de7943526d338c2365b7

  • SHA512

    b7381c4fef6e628ceb678213d5fbb6adbe68b0b81b3e88ab736db704e690cee6286dfec0a28187cc853964e8d6efaf178e78018c871df6826d0a3eda6790c18a

  • SSDEEP

    24576:88ZMAyYW////////////////////////////////////////////////////////:TZa

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
  • 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).

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\4336baec00605852af5cc8bd1d16062d9284c49c13a2de7943526d338c2365b7.exe
    "C:\Users\Admin\AppData\Local\Temp\4336baec00605852af5cc8bd1d16062d9284c49c13a2de7943526d338c2365b7.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1644
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cnzaaxct\
      2⤵
        PID:2812
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xvfgiehn.exe" C:\Windows\SysWOW64\cnzaaxct\
        2⤵
          PID:3040
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create cnzaaxct binPath= "C:\Windows\SysWOW64\cnzaaxct\xvfgiehn.exe /d\"C:\Users\Admin\AppData\Local\Temp\4336baec00605852af5cc8bd1d16062d9284c49c13a2de7943526d338c2365b7.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2648
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description cnzaaxct "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3060
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start cnzaaxct
          2⤵
          • Launches sc.exe
          PID:2212
        • 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
          PID:340
      • C:\Windows\SysWOW64\cnzaaxct\xvfgiehn.exe
        C:\Windows\SysWOW64\cnzaaxct\xvfgiehn.exe /d"C:\Users\Admin\AppData\Local\Temp\4336baec00605852af5cc8bd1d16062d9284c49c13a2de7943526d338c2365b7.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2472
        • 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:2928

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        11.5MB

        MD5

        f5ea281289c9c28bd3c80d5418e0b45a

        SHA1

        7319d6958eee75e16bc6b868ac179db260346833

        SHA256

        baf483caf95937a5117a5d3ae9ffcc319515bb1762c3914270ecbbe5f8cb2715

        SHA512

        0e2a2efc3c737f6a317b5ea97c4902d7bd5534299cb51c86834b7c8a19c9634512b6fa764bec7796fa7312e3570a4c1eeaab03a1a11de832482d9d9353b87705

      • memory/1644-4-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1644-2-0x00000000003C0000-0x00000000003D3000-memory.dmp

        Filesize

        76KB

      • memory/1644-8-0x0000000000400000-0x0000000000867000-memory.dmp

        Filesize

        4.4MB

      • memory/1644-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/1644-1-0x0000000000250000-0x0000000000350000-memory.dmp

        Filesize

        1024KB

      • memory/2472-14-0x0000000000400000-0x0000000000867000-memory.dmp

        Filesize

        4.4MB

      • memory/2928-49-0x0000000000130000-0x0000000000135000-memory.dmp

        Filesize

        20KB

      • memory/2928-43-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/2928-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

        Filesize

        4KB

      • memory/2928-13-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/2928-17-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/2928-22-0x0000000001BC0000-0x0000000001DCF000-memory.dmp

        Filesize

        2.1MB

      • memory/2928-19-0x0000000001BC0000-0x0000000001DCF000-memory.dmp

        Filesize

        2.1MB

      • memory/2928-26-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/2928-53-0x0000000005730000-0x0000000005B3B000-memory.dmp

        Filesize

        4.0MB

      • memory/2928-54-0x0000000000190000-0x0000000000197000-memory.dmp

        Filesize

        28KB

      • memory/2928-50-0x0000000005730000-0x0000000005B3B000-memory.dmp

        Filesize

        4.0MB

      • memory/2928-10-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/2928-46-0x0000000000130000-0x0000000000135000-memory.dmp

        Filesize

        20KB

      • memory/2928-45-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/2928-44-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/2928-16-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/2928-42-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/2928-41-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/2928-40-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/2928-39-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/2928-38-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/2928-37-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/2928-36-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/2928-35-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/2928-34-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/2928-33-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/2928-32-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/2928-31-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/2928-30-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/2928-29-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/2928-23-0x0000000000110000-0x0000000000116000-memory.dmp

        Filesize

        24KB