Analysis

  • max time kernel
    148s
  • max time network
    154s
  • 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 13:32

General

  • Target

    480bb7c62d6d596c5c800503158a552287674a749640cd93d17fd731566a9824.exe

  • Size

    264KB

  • MD5

    50d80adb391a32562abd1bbb1ca44d54

  • SHA1

    6b2f264f7929a5315a783e310a521677be483e9d

  • SHA256

    480bb7c62d6d596c5c800503158a552287674a749640cd93d17fd731566a9824

  • SHA512

    05cd8ee3277fcc0250b3abaa2c99ba5e923028855539b3b4423db835d644112aa39ae5bab832d80b9781d77a1e325685544a8a36c40ac1541c3fecf07693d168

  • SSDEEP

    3072:GBp0+j2liTED5ID9bJiJn1K2Dxodv32z+1EeijhVP/EmvI9G5qpRvm:GBp0OD/2zGQVP/em

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 3 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\480bb7c62d6d596c5c800503158a552287674a749640cd93d17fd731566a9824.exe
    "C:\Users\Admin\AppData\Local\Temp\480bb7c62d6d596c5c800503158a552287674a749640cd93d17fd731566a9824.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1148
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lcclgjnk\
      2⤵
        PID:4984
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ubezyssm.exe" C:\Windows\SysWOW64\lcclgjnk\
        2⤵
          PID:3924
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create lcclgjnk binPath= "C:\Windows\SysWOW64\lcclgjnk\ubezyssm.exe /d\"C:\Users\Admin\AppData\Local\Temp\480bb7c62d6d596c5c800503158a552287674a749640cd93d17fd731566a9824.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3816
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description lcclgjnk "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3976
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start lcclgjnk
          2⤵
          • Launches sc.exe
          PID:3004
        • 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:4832
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1148 -s 1036
          2⤵
          • Program crash
          PID:2544
      • C:\Windows\SysWOW64\lcclgjnk\ubezyssm.exe
        C:\Windows\SysWOW64\lcclgjnk\ubezyssm.exe /d"C:\Users\Admin\AppData\Local\Temp\480bb7c62d6d596c5c800503158a552287674a749640cd93d17fd731566a9824.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:956
        • 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:3576
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 956 -s 516
          2⤵
          • Program crash
          PID:3276
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 1148 -ip 1148
        1⤵
          PID:1480
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 956 -ip 956
          1⤵
            PID:1780

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

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

            11.8MB

            MD5

            e8383b7a214405598bbd55ebd0386ec9

            SHA1

            20511e0efb2990f38305b8160776369e3a57ca1c

            SHA256

            43604382e963478eba1991c8540441d983e923b60c1c2cd03b7f9d993b598b34

            SHA512

            eb9ac8daf61ede9dcd9b3963ace78d63cc6718240c3c55deee78d8857e3a9036c573abe587138da94fa07128d312c8b5f506ff533eb42adf85f0c57581416980

          • memory/956-10-0x0000000000700000-0x0000000000800000-memory.dmp
            Filesize

            1024KB

          • memory/956-11-0x0000000000400000-0x0000000000446000-memory.dmp
            Filesize

            280KB

          • memory/956-16-0x0000000000400000-0x0000000000446000-memory.dmp
            Filesize

            280KB

          • memory/1148-3-0x0000000000400000-0x0000000000446000-memory.dmp
            Filesize

            280KB

          • memory/1148-2-0x0000000000460000-0x0000000000473000-memory.dmp
            Filesize

            76KB

          • memory/1148-7-0x0000000000400000-0x0000000000446000-memory.dmp
            Filesize

            280KB

          • memory/1148-8-0x0000000000460000-0x0000000000473000-memory.dmp
            Filesize

            76KB

          • memory/1148-1-0x00000000004B0000-0x00000000005B0000-memory.dmp
            Filesize

            1024KB

          • memory/3576-12-0x0000000000A10000-0x0000000000A25000-memory.dmp
            Filesize

            84KB

          • memory/3576-15-0x0000000000A10000-0x0000000000A25000-memory.dmp
            Filesize

            84KB

          • memory/3576-17-0x0000000000A10000-0x0000000000A25000-memory.dmp
            Filesize

            84KB

          • memory/3576-19-0x0000000000A10000-0x0000000000A25000-memory.dmp
            Filesize

            84KB