Analysis

  • max time kernel
    126s
  • max time network
    130s
  • platform
    windows7_x64
  • resource
    win7-en-20211208
  • submitted
    01-02-2022 02:43

General

  • Target

    Tax Payment Challan.exe

  • Size

    816KB

  • MD5

    7179c01d287ea46e21056c636762968e

  • SHA1

    a415e62ffb1aa36634d5829e4860440f98623358

  • SHA256

    c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9

  • SHA512

    875034e75889847861f603afada2ea5a7ebc1058e84dea5759dd8528055ad48cfd2b64bca3109721ccc2a16f171b8368649603955d69583380ec1400e5b34dfc

Malware Config

Signatures

  • Kutaki

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

  • Kutaki Executable 3 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.

  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 12 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Tax Payment Challan.exe
    "C:\Users\Admin\AppData\Local\Temp\Tax Payment Challan.exe"
    1⤵
    • Drops startup file
    • Loads dropped DLL
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:1688
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp
      2⤵
        PID:844
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\msiyksch.exe
        "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\msiyksch.exe"
        2⤵
        • Executes dropped EXE
        • Suspicious use of SetWindowsHookEx
        PID:1360
    • C:\Windows\SysWOW64\DllHost.exe
      C:\Windows\SysWOW64\DllHost.exe /Processid:{76D0CB12-7604-4048-B83C-1005C7DDC503}
      1⤵
      • Suspicious use of FindShellTrayWindow
      PID:1900

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      MD5

      7179c01d287ea46e21056c636762968e

      SHA1

      a415e62ffb1aa36634d5829e4860440f98623358

      SHA256

      c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9

      SHA512

      875034e75889847861f603afada2ea5a7ebc1058e84dea5759dd8528055ad48cfd2b64bca3109721ccc2a16f171b8368649603955d69583380ec1400e5b34dfc

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

      MD5

      7179c01d287ea46e21056c636762968e

      SHA1

      a415e62ffb1aa36634d5829e4860440f98623358

      SHA256

      c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9

      SHA512

      875034e75889847861f603afada2ea5a7ebc1058e84dea5759dd8528055ad48cfd2b64bca3109721ccc2a16f171b8368649603955d69583380ec1400e5b34dfc

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

      MD5

      7179c01d287ea46e21056c636762968e

      SHA1

      a415e62ffb1aa36634d5829e4860440f98623358

      SHA256

      c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9

      SHA512

      875034e75889847861f603afada2ea5a7ebc1058e84dea5759dd8528055ad48cfd2b64bca3109721ccc2a16f171b8368649603955d69583380ec1400e5b34dfc

    • memory/844-59-0x0000000000450000-0x0000000000452000-memory.dmp

      Filesize

      8KB

    • memory/1360-71-0x00000000007C0000-0x00000000007D2000-memory.dmp

      Filesize

      72KB

    • memory/1360-72-0x00000000026B0000-0x00000000026DA000-memory.dmp

      Filesize

      168KB

    • memory/1688-56-0x0000000075191000-0x0000000075193000-memory.dmp

      Filesize

      8KB

    • memory/1688-62-0x0000000000520000-0x0000000000541000-memory.dmp

      Filesize

      132KB

    • memory/1688-63-0x00000000003D0000-0x00000000003E2000-memory.dmp

      Filesize

      72KB

    • memory/1688-64-0x00000000032C0000-0x00000000032EA000-memory.dmp

      Filesize

      168KB

    • memory/1900-60-0x00000000000F0000-0x00000000000F2000-memory.dmp

      Filesize

      8KB

    • memory/1900-61-0x00000000002C0000-0x00000000002C1000-memory.dmp

      Filesize

      4KB