Analysis

  • max time kernel
    142s
  • max time network
    128s
  • platform
    windows10_x64
  • resource
    win10-en-20211014
  • 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 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops startup file 2 IoCs
  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of SetWindowsHookEx 10 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe
    "C:\Users\Admin\AppData\Local\Temp\Tax Payment.exe"
    1⤵
    • Drops startup file
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:3028
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp
      2⤵
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:2908
      • C:\Windows\SysWOW64\mspaint.exe
        "C:\Windows\system32\mspaint.exe" "C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp"
        3⤵
        • Drops file in Windows directory
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of SetWindowsHookEx
        PID:2316
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\vbgofoch.exe
      "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\vbgofoch.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetWindowsHookEx
      PID:1280
  • \??\c:\windows\system32\svchost.exe
    c:\windows\system32\svchost.exe -k localsystemnetworkrestricted -s DeviceAssociationService
    1⤵
      PID:2820

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

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

      MD5

      ea8ff94f74983ea0fe9f96f4df50850b

      SHA1

      f1bd1b5edae636b45833d3c080a65c7cf3b47ed6

      SHA256

      991e72f2d6213d5841b0286574c5d0a387c662c9912faf477183768538754e4b

      SHA512

      6df7184111dcdf812bc44e006eafd232946014678c3d24742fe10742dfe97ce08548d0dca71f4b28265abf7e248cb0435e108f787fa73f98222f419d2acc6177

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

      MD5

      ea8ff94f74983ea0fe9f96f4df50850b

      SHA1

      f1bd1b5edae636b45833d3c080a65c7cf3b47ed6

      SHA256

      991e72f2d6213d5841b0286574c5d0a387c662c9912faf477183768538754e4b

      SHA512

      6df7184111dcdf812bc44e006eafd232946014678c3d24742fe10742dfe97ce08548d0dca71f4b28265abf7e248cb0435e108f787fa73f98222f419d2acc6177

    • memory/1280-122-0x0000000000000000-mapping.dmp

    • memory/1280-125-0x00000000004C0000-0x00000000004C6000-memory.dmp

      Filesize

      24KB

    • memory/1280-126-0x00000000004C0000-0x00000000004CA000-memory.dmp

      Filesize

      40KB

    • memory/2316-121-0x0000000000000000-mapping.dmp

    • memory/2908-120-0x0000000000000000-mapping.dmp

    • memory/3028-118-0x00000000001E0000-0x00000000001E6000-memory.dmp

      Filesize

      24KB

    • memory/3028-119-0x00000000001E0000-0x00000000001EA000-memory.dmp

      Filesize

      40KB