Analysis

  • max time kernel
    144s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231020-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231020-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/11/2023, 07:24

General

  • Target

    file.exe

  • Size

    265KB

  • MD5

    695c14c51ae9ff59157cf69f97b2d1cc

  • SHA1

    4688eea11efa5c61c7704b5ca80196eb9099e867

  • SHA256

    f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1

  • SHA512

    e43e45420544f2fd736f2427443941f1da5b8d4a74d4c9d2e0a95c8306b2f10e12beaa6b0c2ec2715ecbd66b41431f404c942c32720a8b3ee2afa640657d4688

  • SSDEEP

    3072:d6LaowspCAE+mYgDxv5l7Iek5Ym7IQoiteVFWbVD22WsgAsR6c7ovb3TQh9:SaWCAF5Cf7Iem57InitGMxycQMrT

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 1 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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2968
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dbtqwghs\
      2⤵
        PID:2628
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\runyyhii.exe" C:\Windows\SysWOW64\dbtqwghs\
        2⤵
          PID:2932
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dbtqwghs binPath= "C:\Windows\SysWOW64\dbtqwghs\runyyhii.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2624
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dbtqwghs "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2284
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dbtqwghs
          2⤵
          • Launches sc.exe
          PID:3624
        • 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:3616
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2968 -s 1368
          2⤵
          • Program crash
          PID:3048
      • C:\Windows\SysWOW64\dbtqwghs\runyyhii.exe
        C:\Windows\SysWOW64\dbtqwghs\runyyhii.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:888
        • 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:912
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 888 -s 548
          2⤵
          • Program crash
          PID:2340
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 2968 -ip 2968
        1⤵
          PID:2896
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 888 -ip 888
          1⤵
            PID:5020

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            12.7MB

            MD5

            f45a72f8163908d79170e35ec5fbb6db

            SHA1

            82298b7ad0e2aec079fb6a8692a818772cb18914

            SHA256

            b801298069aee9d887e85ef00f2cc0ad2738bbfacbb3a97d9288bdfc53570f1d

            SHA512

            80bb0d38add097212d03f0e41a2a23cc3a9b99f8c76f734c63ad5aa75276eb18e3de381861d2f940f6547fd4a69f0208f692cbd0be9a1a62c370f85b566edad1

          • C:\Windows\SysWOW64\dbtqwghs\runyyhii.exe

            Filesize

            12.7MB

            MD5

            f45a72f8163908d79170e35ec5fbb6db

            SHA1

            82298b7ad0e2aec079fb6a8692a818772cb18914

            SHA256

            b801298069aee9d887e85ef00f2cc0ad2738bbfacbb3a97d9288bdfc53570f1d

            SHA512

            80bb0d38add097212d03f0e41a2a23cc3a9b99f8c76f734c63ad5aa75276eb18e3de381861d2f940f6547fd4a69f0208f692cbd0be9a1a62c370f85b566edad1

          • memory/888-11-0x00000000005E0000-0x00000000006E0000-memory.dmp

            Filesize

            1024KB

          • memory/888-18-0x0000000000400000-0x00000000004F6000-memory.dmp

            Filesize

            984KB

          • memory/888-12-0x0000000000400000-0x00000000004F6000-memory.dmp

            Filesize

            984KB

          • memory/912-33-0x0000000002220000-0x0000000002230000-memory.dmp

            Filesize

            64KB

          • memory/912-36-0x0000000002220000-0x0000000002230000-memory.dmp

            Filesize

            64KB

          • memory/912-59-0x0000000000140000-0x0000000000155000-memory.dmp

            Filesize

            84KB

          • memory/912-10-0x0000000000140000-0x0000000000155000-memory.dmp

            Filesize

            84KB

          • memory/912-55-0x0000000007450000-0x0000000007457000-memory.dmp

            Filesize

            28KB

          • memory/912-16-0x0000000000140000-0x0000000000155000-memory.dmp

            Filesize

            84KB

          • memory/912-17-0x0000000000140000-0x0000000000155000-memory.dmp

            Filesize

            84KB

          • memory/912-54-0x0000000006F00000-0x000000000730B000-memory.dmp

            Filesize

            4.0MB

          • memory/912-20-0x0000000002000000-0x000000000220F000-memory.dmp

            Filesize

            2.1MB

          • memory/912-23-0x0000000002000000-0x000000000220F000-memory.dmp

            Filesize

            2.1MB

          • memory/912-24-0x0000000002210000-0x0000000002216000-memory.dmp

            Filesize

            24KB

          • memory/912-27-0x0000000002220000-0x0000000002230000-memory.dmp

            Filesize

            64KB

          • memory/912-30-0x0000000002220000-0x0000000002230000-memory.dmp

            Filesize

            64KB

          • memory/912-31-0x0000000002220000-0x0000000002230000-memory.dmp

            Filesize

            64KB

          • memory/912-32-0x0000000002220000-0x0000000002230000-memory.dmp

            Filesize

            64KB

          • memory/912-51-0x0000000006F00000-0x000000000730B000-memory.dmp

            Filesize

            4.0MB

          • memory/912-34-0x0000000002220000-0x0000000002230000-memory.dmp

            Filesize

            64KB

          • memory/912-50-0x00000000023F0000-0x00000000023F5000-memory.dmp

            Filesize

            20KB

          • memory/912-35-0x0000000002220000-0x0000000002230000-memory.dmp

            Filesize

            64KB

          • memory/912-37-0x0000000002220000-0x0000000002230000-memory.dmp

            Filesize

            64KB

          • memory/912-38-0x0000000002220000-0x0000000002230000-memory.dmp

            Filesize

            64KB

          • memory/912-39-0x0000000002220000-0x0000000002230000-memory.dmp

            Filesize

            64KB

          • memory/912-40-0x0000000002220000-0x0000000002230000-memory.dmp

            Filesize

            64KB

          • memory/912-41-0x0000000002220000-0x0000000002230000-memory.dmp

            Filesize

            64KB

          • memory/912-42-0x0000000002220000-0x0000000002230000-memory.dmp

            Filesize

            64KB

          • memory/912-43-0x0000000002220000-0x0000000002230000-memory.dmp

            Filesize

            64KB

          • memory/912-44-0x0000000002220000-0x0000000002230000-memory.dmp

            Filesize

            64KB

          • memory/912-45-0x0000000002220000-0x0000000002230000-memory.dmp

            Filesize

            64KB

          • memory/912-46-0x0000000002220000-0x0000000002230000-memory.dmp

            Filesize

            64KB

          • memory/912-47-0x00000000023F0000-0x00000000023F5000-memory.dmp

            Filesize

            20KB

          • memory/2968-7-0x0000000000400000-0x00000000004F6000-memory.dmp

            Filesize

            984KB

          • memory/2968-1-0x00000000006C0000-0x00000000007C0000-memory.dmp

            Filesize

            1024KB

          • memory/2968-2-0x00000000006A0000-0x00000000006B3000-memory.dmp

            Filesize

            76KB

          • memory/2968-3-0x0000000000400000-0x00000000004F6000-memory.dmp

            Filesize

            984KB

          • memory/2968-8-0x00000000006A0000-0x00000000006B3000-memory.dmp

            Filesize

            76KB