Analysis

  • max time kernel
    150s
  • max time network
    155s
  • 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 13:35

General

  • Target

    30205eaf6f581036262bfc099dfc5cc5d0e4d771dca3d1c4cf3dada59d097672.exe

  • Size

    240KB

  • MD5

    5c1b720ec28a3d4af24a19003fb56f50

  • SHA1

    fa8c1236c3e7bc4d002be0abf5523659bf4c9af8

  • SHA256

    30205eaf6f581036262bfc099dfc5cc5d0e4d771dca3d1c4cf3dada59d097672

  • SHA512

    178e4b5633b1c4d455555b394940d6b240dc4da22e621e6c91035870f3e275b25881ea712fc7b73a4e73d9d9376045834fb00b3d03454616d877ecd3cd91790c

  • SSDEEP

    3072:JQT/QLtwugcvGMI9+x7alYjt8T/NOOZ/M5l/evBr+jL+0geRp:JE/QLXgSh7aSjtGZ/M5lP3ge

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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\30205eaf6f581036262bfc099dfc5cc5d0e4d771dca3d1c4cf3dada59d097672.exe
    "C:\Users\Admin\AppData\Local\Temp\30205eaf6f581036262bfc099dfc5cc5d0e4d771dca3d1c4cf3dada59d097672.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1688
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fyvkqwfv\
      2⤵
        PID:5084
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mbtafdia.exe" C:\Windows\SysWOW64\fyvkqwfv\
        2⤵
          PID:772
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fyvkqwfv binPath= "C:\Windows\SysWOW64\fyvkqwfv\mbtafdia.exe /d\"C:\Users\Admin\AppData\Local\Temp\30205eaf6f581036262bfc099dfc5cc5d0e4d771dca3d1c4cf3dada59d097672.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4848
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fyvkqwfv "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4844
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fyvkqwfv
          2⤵
          • Launches sc.exe
          PID:696
        • 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:2256
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1688 -s 1224
          2⤵
          • Program crash
          PID:4932
      • C:\Windows\SysWOW64\fyvkqwfv\mbtafdia.exe
        C:\Windows\SysWOW64\fyvkqwfv\mbtafdia.exe /d"C:\Users\Admin\AppData\Local\Temp\30205eaf6f581036262bfc099dfc5cc5d0e4d771dca3d1c4cf3dada59d097672.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3488
        • 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:3180
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3488 -s 560
          2⤵
          • Program crash
          PID:2348
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 1688 -ip 1688
        1⤵
          PID:948
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 3488 -ip 3488
          1⤵
            PID:3308

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

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

            12.6MB

            MD5

            5edaa4cfbfa5566890742fafa60b713a

            SHA1

            d3d8813ada2b40b9e359cd2e84a71700adb47934

            SHA256

            36bc84d9607bcca698c62b0d49199709dde49772dd7da1f95d29da224f46f994

            SHA512

            bfefb56ea31dff399a0604adea6557e4617ec354159de33458ed7a020b4eec0f370dbc589854a9440e0cebe2296df788e471bb8d687587ec317878a28289ad8a

          • memory/1688-1-0x0000000000AC0000-0x0000000000BC0000-memory.dmp
            Filesize

            1024KB

          • memory/1688-2-0x00000000025A0000-0x00000000025B3000-memory.dmp
            Filesize

            76KB

          • memory/1688-4-0x0000000000400000-0x000000000085D000-memory.dmp
            Filesize

            4.4MB

          • memory/1688-8-0x0000000000400000-0x000000000085D000-memory.dmp
            Filesize

            4.4MB

          • memory/1688-9-0x00000000025A0000-0x00000000025B3000-memory.dmp
            Filesize

            76KB

          • memory/3180-32-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/3180-36-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/3180-12-0x0000000000160000-0x0000000000175000-memory.dmp
            Filesize

            84KB

          • memory/3180-15-0x0000000000160000-0x0000000000175000-memory.dmp
            Filesize

            84KB

          • memory/3180-16-0x0000000000160000-0x0000000000175000-memory.dmp
            Filesize

            84KB

          • memory/3180-56-0x00000000025E0000-0x00000000025E7000-memory.dmp
            Filesize

            28KB

          • memory/3180-18-0x0000000000160000-0x0000000000175000-memory.dmp
            Filesize

            84KB

          • memory/3180-20-0x0000000000160000-0x0000000000175000-memory.dmp
            Filesize

            84KB

          • memory/3180-21-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/3180-24-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/3180-25-0x0000000001720000-0x0000000001726000-memory.dmp
            Filesize

            24KB

          • memory/3180-28-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/3180-31-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/3180-33-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/3180-55-0x0000000007200000-0x000000000760B000-memory.dmp
            Filesize

            4.0MB

          • memory/3180-34-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/3180-35-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/3180-52-0x0000000007200000-0x000000000760B000-memory.dmp
            Filesize

            4.0MB

          • memory/3180-38-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/3180-39-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/3180-37-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/3180-40-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/3180-41-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/3180-42-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/3180-44-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/3180-45-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/3180-43-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/3180-46-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/3180-47-0x0000000001730000-0x0000000001740000-memory.dmp
            Filesize

            64KB

          • memory/3180-48-0x00000000025D0000-0x00000000025D5000-memory.dmp
            Filesize

            20KB

          • memory/3180-51-0x00000000025D0000-0x00000000025D5000-memory.dmp
            Filesize

            20KB

          • memory/3488-11-0x0000000000400000-0x000000000085D000-memory.dmp
            Filesize

            4.4MB

          • memory/3488-10-0x0000000000AB0000-0x0000000000BB0000-memory.dmp
            Filesize

            1024KB

          • memory/3488-17-0x0000000000400000-0x000000000085D000-memory.dmp
            Filesize

            4.4MB