Analysis

  • max time kernel
    143s
  • max time network
    154s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 14:14

General

  • Target

    2496bd1f22e675f292a9176022379b39bd6c0a74ca928ca3cca4d639a66f108f.exe

  • Size

    233KB

  • MD5

    b9c89c3ed216df0e259b9d0b38a2dc94

  • SHA1

    ea82873249048a2dc026d8bb24616147a9d95729

  • SHA256

    2496bd1f22e675f292a9176022379b39bd6c0a74ca928ca3cca4d639a66f108f

  • SHA512

    ce196ae521c72a6d6ea968a8a948f5ec7040a79616146e8b175accad9277c4a5e825b3af6d45bfde65f430863c0386a5724dd16e07d9b27878082d86a7644c88

  • SSDEEP

    3072:rJWQg26WaXsiQLhJi3s1KMnwFlscekf3O2D+sYc+VhfRv9ae:rJrSiLslsclz+PZ9f

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) 1 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 6 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2496bd1f22e675f292a9176022379b39bd6c0a74ca928ca3cca4d639a66f108f.exe
    "C:\Users\Admin\AppData\Local\Temp\2496bd1f22e675f292a9176022379b39bd6c0a74ca928ca3cca4d639a66f108f.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2180
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kevhossh\
      2⤵
        PID:780
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bnzebhgu.exe" C:\Windows\SysWOW64\kevhossh\
        2⤵
          PID:2716
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create kevhossh binPath= "C:\Windows\SysWOW64\kevhossh\bnzebhgu.exe /d\"C:\Users\Admin\AppData\Local\Temp\2496bd1f22e675f292a9176022379b39bd6c0a74ca928ca3cca4d639a66f108f.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1720
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description kevhossh "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2788
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start kevhossh
          2⤵
          • Launches sc.exe
          PID:2820
        • 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:1488
      • C:\Windows\SysWOW64\kevhossh\bnzebhgu.exe
        C:\Windows\SysWOW64\kevhossh\bnzebhgu.exe /d"C:\Users\Admin\AppData\Local\Temp\2496bd1f22e675f292a9176022379b39bd6c0a74ca928ca3cca4d639a66f108f.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2936
        • 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:2644

      Network

      MITRE ATT&CK Matrix ATT&CK v13

      Persistence

      Create or Modify System Process

      2
      T1543

      Windows Service

      2
      T1543.003

      Boot or Logon Autostart Execution

      1
      T1547

      Registry Run Keys / Startup Folder

      1
      T1547.001

      Privilege Escalation

      Create or Modify System Process

      2
      T1543

      Windows Service

      2
      T1543.003

      Boot or Logon Autostart Execution

      1
      T1547

      Registry Run Keys / Startup Folder

      1
      T1547.001

      Defense Evasion

      Impair Defenses

      2
      T1562

      Disable or Modify Tools

      1
      T1562.001

      Disable or Modify System Firewall

      1
      T1562.004

      Modify Registry

      2
      T1112

      Discovery

      System Information Discovery

      1
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        13.2MB

        MD5

        64dbc2958bc25ccbd2252da2db3541c1

        SHA1

        b16702fd88903bf4e0c221a79ee0d443ded6f612

        SHA256

        1beea04058afccde8bd531973f6f61ce6d32f6bd646ca00bee2242ad2a616c6a

        SHA512

        847fd8391ca79b7bef96e3baa1abdc7cad67edbf9a21d6a259b52762a58440ec9c18b898a41ba4eb2f625fe324772a4cc302ebfb85bd7219442a84d4a7d9b6db

      • memory/2180-1-0x00000000005D0000-0x00000000006D0000-memory.dmp
        Filesize

        1024KB

      • memory/2180-2-0x0000000000230000-0x0000000000243000-memory.dmp
        Filesize

        76KB

      • memory/2180-4-0x0000000000400000-0x000000000043E000-memory.dmp
        Filesize

        248KB

      • memory/2180-7-0x0000000000400000-0x000000000043E000-memory.dmp
        Filesize

        248KB

      • memory/2180-8-0x0000000000230000-0x0000000000243000-memory.dmp
        Filesize

        76KB

      • memory/2644-35-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2644-38-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2644-62-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2644-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2644-15-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2644-58-0x0000000000180000-0x0000000000187000-memory.dmp
        Filesize

        28KB

      • memory/2644-20-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2644-21-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2644-23-0x0000000001860000-0x0000000001A6F000-memory.dmp
        Filesize

        2.1MB

      • memory/2644-26-0x0000000001860000-0x0000000001A6F000-memory.dmp
        Filesize

        2.1MB

      • memory/2644-27-0x0000000000080000-0x0000000000086000-memory.dmp
        Filesize

        24KB

      • memory/2644-30-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2644-33-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2644-34-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2644-12-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2644-36-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2644-37-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2644-57-0x0000000005590000-0x000000000599B000-memory.dmp
        Filesize

        4.0MB

      • memory/2644-39-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2644-40-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2644-41-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2644-42-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2644-43-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2644-44-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2644-45-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2644-46-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2644-47-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2644-48-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2644-49-0x0000000000160000-0x0000000000170000-memory.dmp
        Filesize

        64KB

      • memory/2644-50-0x0000000000170000-0x0000000000175000-memory.dmp
        Filesize

        20KB

      • memory/2644-53-0x0000000000170000-0x0000000000175000-memory.dmp
        Filesize

        20KB

      • memory/2644-54-0x0000000005590000-0x000000000599B000-memory.dmp
        Filesize

        4.0MB

      • memory/2936-11-0x0000000000400000-0x000000000043E000-memory.dmp
        Filesize

        248KB

      • memory/2936-17-0x0000000000400000-0x000000000043E000-memory.dmp
        Filesize

        248KB

      • memory/2936-10-0x00000000004F0000-0x00000000005F0000-memory.dmp
        Filesize

        1024KB