Analysis

  • max time kernel
    124s
  • max time network
    122s
  • platform
    windows10_x64
  • resource
    win10-en-20211104
  • submitted
    05-12-2021 03:49

General

  • Target

    image.exe

  • Size

    460KB

  • MD5

    41272cf867595eea4c729a1e3d2c97f4

  • SHA1

    1ee33f8015955ba97e422c6e7fa55949706dcc90

  • SHA256

    0a135e636efd63a00b06c31ffb57a6ec40dd466d9ff8ad4a3b34763356b76d03

  • SHA512

    140f13f827bbc62eed5b85ef8ee576b85cef24aea7ac37ba74307a63e67b82f0b400116ddda514bf45cbf673124becd57808b6c11915608b3fb664646d266b5f

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:2800
    • 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:3964
      • 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:1184
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\pvffkich.exe
      "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\pvffkich.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetWindowsHookEx
      PID:1440
  • \??\c:\windows\system32\svchost.exe
    c:\windows\system32\svchost.exe -k localsystemnetworkrestricted -s DeviceAssociationService
    1⤵
      PID:664

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      MD5

      41272cf867595eea4c729a1e3d2c97f4

      SHA1

      1ee33f8015955ba97e422c6e7fa55949706dcc90

      SHA256

      0a135e636efd63a00b06c31ffb57a6ec40dd466d9ff8ad4a3b34763356b76d03

      SHA512

      140f13f827bbc62eed5b85ef8ee576b85cef24aea7ac37ba74307a63e67b82f0b400116ddda514bf45cbf673124becd57808b6c11915608b3fb664646d266b5f

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

      MD5

      41272cf867595eea4c729a1e3d2c97f4

      SHA1

      1ee33f8015955ba97e422c6e7fa55949706dcc90

      SHA256

      0a135e636efd63a00b06c31ffb57a6ec40dd466d9ff8ad4a3b34763356b76d03

      SHA512

      140f13f827bbc62eed5b85ef8ee576b85cef24aea7ac37ba74307a63e67b82f0b400116ddda514bf45cbf673124becd57808b6c11915608b3fb664646d266b5f

    • memory/1184-121-0x0000000000000000-mapping.dmp

    • memory/1440-122-0x0000000000000000-mapping.dmp

    • memory/1440-125-0x00000000001D0000-0x00000000001D6000-memory.dmp

      Filesize

      24KB

    • memory/1440-126-0x00000000001D0000-0x00000000001DA000-memory.dmp

      Filesize

      40KB

    • memory/3964-120-0x0000000000000000-mapping.dmp