Analysis

  • max time kernel
    129s
  • max time network
    152s
  • platform
    windows10_x64
  • resource
    win10-en-20211014
  • submitted
    20-11-2021 07:53

General

  • Target

    image.exe

  • Size

    592KB

  • MD5

    e4cc7fb761fc4110b631dbabf46363e1

  • SHA1

    f433972fe7fb1b165eaedadb2d31193e94ba2d33

  • SHA256

    c0478341ec19cae4fd4093d53e9cc777210ad57122836f4aa911addeacc911f9

  • SHA512

    918178d680dadb3929a1a399717914fd3539925a933da42d259f0516c929f6241ab6fb3f8d1d7ee2d7b3f47758ec1455f4f6189f2a43ecc55fe4a45f2990ae65

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\image.exe
    "C:\Users\Admin\AppData\Local\Temp\image.exe"
    1⤵
    • Drops startup file
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:3288
    • 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:1268
      • 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:2312
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ppnoybch.exe
      "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ppnoybch.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetWindowsHookEx
      PID:1872
  • \??\c:\windows\system32\svchost.exe
    c:\windows\system32\svchost.exe -k localsystemnetworkrestricted -s DeviceAssociationService
    1⤵
      PID:3964

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

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

      MD5

      e4cc7fb761fc4110b631dbabf46363e1

      SHA1

      f433972fe7fb1b165eaedadb2d31193e94ba2d33

      SHA256

      c0478341ec19cae4fd4093d53e9cc777210ad57122836f4aa911addeacc911f9

      SHA512

      918178d680dadb3929a1a399717914fd3539925a933da42d259f0516c929f6241ab6fb3f8d1d7ee2d7b3f47758ec1455f4f6189f2a43ecc55fe4a45f2990ae65

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

      MD5

      e4cc7fb761fc4110b631dbabf46363e1

      SHA1

      f433972fe7fb1b165eaedadb2d31193e94ba2d33

      SHA256

      c0478341ec19cae4fd4093d53e9cc777210ad57122836f4aa911addeacc911f9

      SHA512

      918178d680dadb3929a1a399717914fd3539925a933da42d259f0516c929f6241ab6fb3f8d1d7ee2d7b3f47758ec1455f4f6189f2a43ecc55fe4a45f2990ae65

    • memory/1268-117-0x0000000000000000-mapping.dmp

    • memory/1872-119-0x0000000000000000-mapping.dmp

    • memory/2312-118-0x0000000000000000-mapping.dmp

    • memory/3288-115-0x0000000000630000-0x0000000000636000-memory.dmp

      Filesize

      24KB

    • memory/3288-116-0x0000000000630000-0x000000000063A000-memory.dmp

      Filesize

      40KB