Analysis

  • max time kernel
    150s
  • max time network
    119s
  • platform
    windows7_x64
  • resource
    win7-en-20211104
  • submitted
    01-12-2021 09:17

General

  • Target

    Tax Payment.exe

  • Size

    592KB

  • MD5

    ea8ff94f74983ea0fe9f96f4df50850b

  • SHA1

    f1bd1b5edae636b45833d3c080a65c7cf3b47ed6

  • SHA256

    991e72f2d6213d5841b0286574c5d0a387c662c9912faf477183768538754e4b

  • SHA512

    6df7184111dcdf812bc44e006eafd232946014678c3d24742fe10742dfe97ce08548d0dca71f4b28265abf7e248cb0435e108f787fa73f98222f419d2acc6177

Malware Config

Signatures

  • Kutaki

    Information stealer and keylogger that hides inside legitimate Visual Basic applications.

  • Kutaki Executable 4 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops startup file 2 IoCs
  • Loads dropped DLL 2 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Modifies Internet Explorer settings 1 TTPs 1 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 64 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe
    "C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe"
    1⤵
    • Drops startup file
    • Loads dropped DLL
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:672
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp
      2⤵
        PID:552
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe
        "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe"
        2⤵
        • Executes dropped EXE
        • Modifies Internet Explorer settings
        • Suspicious use of SetWindowsHookEx
        PID:1004
    • C:\Windows\SysWOW64\DllHost.exe
      C:\Windows\SysWOW64\DllHost.exe /Processid:{76D0CB12-7604-4048-B83C-1005C7DDC503}
      1⤵
      • Suspicious use of FindShellTrayWindow
      PID:1604

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe

      MD5

      ea8ff94f74983ea0fe9f96f4df50850b

      SHA1

      f1bd1b5edae636b45833d3c080a65c7cf3b47ed6

      SHA256

      991e72f2d6213d5841b0286574c5d0a387c662c9912faf477183768538754e4b

      SHA512

      6df7184111dcdf812bc44e006eafd232946014678c3d24742fe10742dfe97ce08548d0dca71f4b28265abf7e248cb0435e108f787fa73f98222f419d2acc6177

    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe

      MD5

      ea8ff94f74983ea0fe9f96f4df50850b

      SHA1

      f1bd1b5edae636b45833d3c080a65c7cf3b47ed6

      SHA256

      991e72f2d6213d5841b0286574c5d0a387c662c9912faf477183768538754e4b

      SHA512

      6df7184111dcdf812bc44e006eafd232946014678c3d24742fe10742dfe97ce08548d0dca71f4b28265abf7e248cb0435e108f787fa73f98222f419d2acc6177

    • \Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe

      MD5

      ea8ff94f74983ea0fe9f96f4df50850b

      SHA1

      f1bd1b5edae636b45833d3c080a65c7cf3b47ed6

      SHA256

      991e72f2d6213d5841b0286574c5d0a387c662c9912faf477183768538754e4b

      SHA512

      6df7184111dcdf812bc44e006eafd232946014678c3d24742fe10742dfe97ce08548d0dca71f4b28265abf7e248cb0435e108f787fa73f98222f419d2acc6177

    • \Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\riptxach.exe

      MD5

      ea8ff94f74983ea0fe9f96f4df50850b

      SHA1

      f1bd1b5edae636b45833d3c080a65c7cf3b47ed6

      SHA256

      991e72f2d6213d5841b0286574c5d0a387c662c9912faf477183768538754e4b

      SHA512

      6df7184111dcdf812bc44e006eafd232946014678c3d24742fe10742dfe97ce08548d0dca71f4b28265abf7e248cb0435e108f787fa73f98222f419d2acc6177

    • memory/552-58-0x0000000000000000-mapping.dmp

    • memory/552-68-0x0000000000680000-0x0000000000682000-memory.dmp

      Filesize

      8KB

    • memory/672-56-0x0000000000220000-0x000000000022A000-memory.dmp

      Filesize

      40KB

    • memory/672-57-0x0000000076A21000-0x0000000076A23000-memory.dmp

      Filesize

      8KB

    • memory/672-55-0x0000000000220000-0x0000000000226000-memory.dmp

      Filesize

      24KB

    • memory/1004-62-0x0000000000000000-mapping.dmp

    • memory/1004-71-0x0000000003F41000-0x0000000004DED000-memory.dmp

      Filesize

      14.7MB

    • memory/1604-70-0x0000000000240000-0x0000000000241000-memory.dmp

      Filesize

      4KB

    • memory/1604-69-0x0000000000120000-0x0000000000122000-memory.dmp

      Filesize

      8KB