Analysis

  • max time kernel
    149s
  • max time network
    149s
  • platform
    windows7_x64
  • resource
    win7-20240419-en
  • resource tags

    arch:x64arch:x86image:win7-20240419-enlocale:en-usos:windows7-x64system
  • submitted
    06-05-2024 09:22

General

  • Target

    efc1bfdb596061a2e27ec7924fbdcb70acf8c896d615c077988df5114042ebda.exe

  • Size

    13.1MB

  • MD5

    bd09867a761f2cf6666ba7d8a7aae353

  • SHA1

    35ae2f285c46a88fe920ed261ca30b47a1c5050d

  • SHA256

    efc1bfdb596061a2e27ec7924fbdcb70acf8c896d615c077988df5114042ebda

  • SHA512

    c1bebbe5bdee67e71c4bc7aade6c3fbfab29083e54794750fb2fe56387c7e58d95febacf1202cbff5ede1793549879248e95043f31f771971f85cbff61fff4e1

  • SSDEEP

    49152:BDY000000000000000000000000000000000000000000000000000000000000H:BD

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

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).

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\efc1bfdb596061a2e27ec7924fbdcb70acf8c896d615c077988df5114042ebda.exe
    "C:\Users\Admin\AppData\Local\Temp\efc1bfdb596061a2e27ec7924fbdcb70acf8c896d615c077988df5114042ebda.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1008
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gmrvemyd\
      2⤵
        PID:1444
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\teafwpbq.exe" C:\Windows\SysWOW64\gmrvemyd\
        2⤵
          PID:3044
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create gmrvemyd binPath= "C:\Windows\SysWOW64\gmrvemyd\teafwpbq.exe /d\"C:\Users\Admin\AppData\Local\Temp\efc1bfdb596061a2e27ec7924fbdcb70acf8c896d615c077988df5114042ebda.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2572
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description gmrvemyd "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2756
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start gmrvemyd
          2⤵
          • Launches sc.exe
          PID:2892
        • 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:2504
      • C:\Windows\SysWOW64\gmrvemyd\teafwpbq.exe
        C:\Windows\SysWOW64\gmrvemyd\teafwpbq.exe /d"C:\Users\Admin\AppData\Local\Temp\efc1bfdb596061a2e27ec7924fbdcb70acf8c896d615c077988df5114042ebda.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2192
        • 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:2540

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        12.4MB

        MD5

        4b481541ec086bf32366fe82d1d386ae

        SHA1

        ac9f716427d9a5cb2c0d0c9e59543d3a3f8e8558

        SHA256

        3785d950a2bf6cbcc47d9d3923b906b6ef1a120f7cc086b1c1b17db227fac6b6

        SHA512

        973b42168f5309cf62ed386ff9f210d41fa1473b029f22416d86ca16f61fa86cedcfa93f265043dbc3374541ebbef35cd200b07f060d4b94c03287c3b1d57b78

      • memory/1008-2-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/1008-3-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/1008-10-0x0000000000400000-0x0000000000415000-memory.dmp
        Filesize

        84KB

      • memory/1008-8-0x0000000000400000-0x0000000002C2E000-memory.dmp
        Filesize

        40.2MB

      • memory/1008-9-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/1008-1-0x0000000002DE0000-0x0000000002EE0000-memory.dmp
        Filesize

        1024KB

      • memory/2192-17-0x0000000000400000-0x0000000002C2E000-memory.dmp
        Filesize

        40.2MB

      • memory/2540-50-0x0000000000360000-0x0000000000365000-memory.dmp
        Filesize

        20KB

      • memory/2540-43-0x0000000000310000-0x0000000000320000-memory.dmp
        Filesize

        64KB

      • memory/2540-16-0x0000000000090000-0x00000000000A5000-memory.dmp
        Filesize

        84KB

      • memory/2540-18-0x0000000000090000-0x00000000000A5000-memory.dmp
        Filesize

        84KB

      • memory/2540-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2540-20-0x0000000001BE0000-0x0000000001DEF000-memory.dmp
        Filesize

        2.1MB

      • memory/2540-23-0x0000000001BE0000-0x0000000001DEF000-memory.dmp
        Filesize

        2.1MB

      • memory/2540-54-0x0000000005730000-0x0000000005B3B000-memory.dmp
        Filesize

        4.0MB

      • memory/2540-51-0x0000000005730000-0x0000000005B3B000-memory.dmp
        Filesize

        4.0MB

      • memory/2540-55-0x0000000000370000-0x0000000000377000-memory.dmp
        Filesize

        28KB

      • memory/2540-14-0x0000000000090000-0x00000000000A5000-memory.dmp
        Filesize

        84KB

      • memory/2540-47-0x0000000000360000-0x0000000000365000-memory.dmp
        Filesize

        20KB

      • memory/2540-46-0x0000000000310000-0x0000000000320000-memory.dmp
        Filesize

        64KB

      • memory/2540-45-0x0000000000310000-0x0000000000320000-memory.dmp
        Filesize

        64KB

      • memory/2540-44-0x0000000000310000-0x0000000000320000-memory.dmp
        Filesize

        64KB

      • memory/2540-11-0x0000000000090000-0x00000000000A5000-memory.dmp
        Filesize

        84KB

      • memory/2540-42-0x0000000000310000-0x0000000000320000-memory.dmp
        Filesize

        64KB

      • memory/2540-41-0x0000000000310000-0x0000000000320000-memory.dmp
        Filesize

        64KB

      • memory/2540-40-0x0000000000310000-0x0000000000320000-memory.dmp
        Filesize

        64KB

      • memory/2540-39-0x0000000000310000-0x0000000000320000-memory.dmp
        Filesize

        64KB

      • memory/2540-38-0x0000000000310000-0x0000000000320000-memory.dmp
        Filesize

        64KB

      • memory/2540-37-0x0000000000310000-0x0000000000320000-memory.dmp
        Filesize

        64KB

      • memory/2540-36-0x0000000000310000-0x0000000000320000-memory.dmp
        Filesize

        64KB

      • memory/2540-35-0x0000000000310000-0x0000000000320000-memory.dmp
        Filesize

        64KB

      • memory/2540-34-0x0000000000310000-0x0000000000320000-memory.dmp
        Filesize

        64KB

      • memory/2540-33-0x0000000000310000-0x0000000000320000-memory.dmp
        Filesize

        64KB

      • memory/2540-32-0x0000000000310000-0x0000000000320000-memory.dmp
        Filesize

        64KB

      • memory/2540-31-0x0000000000310000-0x0000000000320000-memory.dmp
        Filesize

        64KB

      • memory/2540-30-0x0000000000310000-0x0000000000320000-memory.dmp
        Filesize

        64KB

      • memory/2540-27-0x0000000000310000-0x0000000000320000-memory.dmp
        Filesize

        64KB

      • memory/2540-24-0x00000000000C0000-0x00000000000C6000-memory.dmp
        Filesize

        24KB