Analysis

  • max time kernel
    147s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 13:00

General

  • Target

    0becc5527aba7dc1a746846fc3a2b62f2e46568819b2259d4474eb16e96b9be4.exe

  • Size

    258KB

  • MD5

    c604511f8c117ca36984e8aa66ac0a71

  • SHA1

    7ce156eb70e31fbdf62c3d7e60e6eefff7b21c7d

  • SHA256

    0becc5527aba7dc1a746846fc3a2b62f2e46568819b2259d4474eb16e96b9be4

  • SHA512

    031ffc652bd29c52b8ea733fa6a9e37c9908798d4121d0452c2e0207d17086f43451c273b686ef4c086fc859fe6cf906e403bd09008b11cfc2498ec338ae3441

  • SSDEEP

    3072:xkh5eI/cSz90u2DEJClClQoyLwETsrw/eEOobr6e7AXa2jyQfEBw0coqY7IQPJUD:xkh+BEQ0SBTRVOobrPXYES0cWEQRER

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) 1 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).

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\0becc5527aba7dc1a746846fc3a2b62f2e46568819b2259d4474eb16e96b9be4.exe
    "C:\Users\Admin\AppData\Local\Temp\0becc5527aba7dc1a746846fc3a2b62f2e46568819b2259d4474eb16e96b9be4.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3352
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\duzezfzv\
      2⤵
        PID:3212
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\elsvkyrb.exe" C:\Windows\SysWOW64\duzezfzv\
        2⤵
          PID:864
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create duzezfzv binPath= "C:\Windows\SysWOW64\duzezfzv\elsvkyrb.exe /d\"C:\Users\Admin\AppData\Local\Temp\0becc5527aba7dc1a746846fc3a2b62f2e46568819b2259d4474eb16e96b9be4.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3308
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description duzezfzv "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3200
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start duzezfzv
          2⤵
          • Launches sc.exe
          PID:3252
        • 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:2720
      • C:\Windows\SysWOW64\duzezfzv\elsvkyrb.exe
        C:\Windows\SysWOW64\duzezfzv\elsvkyrb.exe /d"C:\Users\Admin\AppData\Local\Temp\0becc5527aba7dc1a746846fc3a2b62f2e46568819b2259d4474eb16e96b9be4.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1380
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:4424

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        10.2MB

        MD5

        82e5f674f99cc9e7b8efb48f9de5e928

        SHA1

        dac314f578d7896e26edbf4b737d36eced26da90

        SHA256

        24d7319858de5f5acadc65cdcf81624b9b82e4f5002aa14c3cd0dcafaeeebb3b

        SHA512

        24102afb2dcad8955bd630bd8cebbe126bbd2f99084d8ba786431a131e98a3162cba0a3f3d696d6dcfd0ab7417674a2ec47a843e36ae72745911edc1864493fc

      • memory/1380-8-0x0000000000450000-0x0000000000550000-memory.dmp

        Filesize

        1024KB

      • memory/1380-9-0x0000000000D10000-0x0000000000D23000-memory.dmp

        Filesize

        76KB

      • memory/1380-10-0x0000000000400000-0x0000000000446000-memory.dmp

        Filesize

        280KB

      • memory/1380-13-0x0000000000400000-0x0000000000446000-memory.dmp

        Filesize

        280KB

      • memory/3352-15-0x0000000000400000-0x0000000000446000-memory.dmp

        Filesize

        280KB

      • memory/3352-2-0x0000000002190000-0x00000000021A3000-memory.dmp

        Filesize

        76KB

      • memory/3352-3-0x0000000000400000-0x0000000000446000-memory.dmp

        Filesize

        280KB

      • memory/3352-1-0x0000000000460000-0x0000000000560000-memory.dmp

        Filesize

        1024KB

      • memory/4424-33-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4424-37-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4424-17-0x0000000000710000-0x0000000000725000-memory.dmp

        Filesize

        84KB

      • memory/4424-18-0x0000000000710000-0x0000000000725000-memory.dmp

        Filesize

        84KB

      • memory/4424-20-0x0000000002600000-0x000000000280F000-memory.dmp

        Filesize

        2.1MB

      • memory/4424-23-0x0000000002600000-0x000000000280F000-memory.dmp

        Filesize

        2.1MB

      • memory/4424-24-0x0000000001DC0000-0x0000000001DC6000-memory.dmp

        Filesize

        24KB

      • memory/4424-27-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4424-31-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4424-30-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4424-32-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4424-11-0x0000000000710000-0x0000000000725000-memory.dmp

        Filesize

        84KB

      • memory/4424-34-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4424-36-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4424-35-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4424-16-0x0000000000710000-0x0000000000725000-memory.dmp

        Filesize

        84KB

      • memory/4424-38-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4424-39-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4424-40-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4424-41-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4424-42-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4424-45-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4424-46-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4424-44-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4424-43-0x0000000001DD0000-0x0000000001DE0000-memory.dmp

        Filesize

        64KB

      • memory/4424-47-0x00000000029D0000-0x00000000029D5000-memory.dmp

        Filesize

        20KB

      • memory/4424-50-0x00000000029D0000-0x00000000029D5000-memory.dmp

        Filesize

        20KB

      • memory/4424-51-0x0000000007640000-0x0000000007A4B000-memory.dmp

        Filesize

        4.0MB

      • memory/4424-54-0x0000000007640000-0x0000000007A4B000-memory.dmp

        Filesize

        4.0MB

      • memory/4424-55-0x00000000029E0000-0x00000000029E7000-memory.dmp

        Filesize

        28KB

      • memory/4424-59-0x0000000000710000-0x0000000000725000-memory.dmp

        Filesize

        84KB