Analysis

  • max time kernel
    126s
  • max time network
    122s
  • platform
    windows10_x64
  • resource
    win10-en-20211104
  • submitted
    01-12-2021 06:25

General

  • Target

    Tax Pyament Challan.exe

  • Size

    460KB

  • MD5

    bcd53d5e0cf0449701730264d03659cc

  • SHA1

    3f8e7e422106b9e3a8b0569c8f879c52a5196bde

  • SHA256

    2da69ffa0187b1b7155fe5083fea59857159ba31aa3757e7f26df834770119a4

  • SHA512

    4ad0adc78bcf6556298455a125f6c61d0d6175bd1f9297d6dd50b4dbedfc89dc51e0ecfa220b96b4150859259e428a763bc71369b809afda4587670f41e78ada

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 Pyament Challan.exe
    "C:\Users\Admin\AppData\Local\Temp\Tax Pyament Challan.exe"
    1⤵
    • Drops startup file
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:2932
    • 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:3340
      • 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:1104
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\dupdojch.exe
      "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\dupdojch.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetWindowsHookEx
      PID:2808
  • \??\c:\windows\system32\svchost.exe
    c:\windows\system32\svchost.exe -k localsystemnetworkrestricted -s DeviceAssociationService
    1⤵
      PID:524

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

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

      MD5

      bcd53d5e0cf0449701730264d03659cc

      SHA1

      3f8e7e422106b9e3a8b0569c8f879c52a5196bde

      SHA256

      2da69ffa0187b1b7155fe5083fea59857159ba31aa3757e7f26df834770119a4

      SHA512

      4ad0adc78bcf6556298455a125f6c61d0d6175bd1f9297d6dd50b4dbedfc89dc51e0ecfa220b96b4150859259e428a763bc71369b809afda4587670f41e78ada

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

      MD5

      bcd53d5e0cf0449701730264d03659cc

      SHA1

      3f8e7e422106b9e3a8b0569c8f879c52a5196bde

      SHA256

      2da69ffa0187b1b7155fe5083fea59857159ba31aa3757e7f26df834770119a4

      SHA512

      4ad0adc78bcf6556298455a125f6c61d0d6175bd1f9297d6dd50b4dbedfc89dc51e0ecfa220b96b4150859259e428a763bc71369b809afda4587670f41e78ada

    • memory/1104-121-0x0000000000000000-mapping.dmp

    • memory/2808-122-0x0000000000000000-mapping.dmp

    • memory/2808-125-0x00000000005A0000-0x00000000005A6000-memory.dmp

      Filesize

      24KB

    • memory/2808-126-0x00000000005A0000-0x00000000005AA000-memory.dmp

      Filesize

      40KB

    • memory/3340-120-0x0000000000000000-mapping.dmp