Analysis

  • max time kernel
    122s
  • max time network
    122s
  • platform
    windows7_x64
  • resource
    win7-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 4 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.

  • Modifies Internet Explorer settings 1 TTPs 1 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 64 IoCs
  • Suspicious use of WriteProcessMemory 8 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
    • Loads dropped DLL
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:1136
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp
      2⤵
        PID:824
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gnbudsch.exe
        "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gnbudsch.exe"
        2⤵
        • Executes dropped EXE
        • Modifies Internet Explorer settings
        • Suspicious use of SetWindowsHookEx
        PID:1160
    • C:\Windows\SysWOW64\DllHost.exe
      C:\Windows\SysWOW64\DllHost.exe /Processid:{76D0CB12-7604-4048-B83C-1005C7DDC503}
      1⤵
      • Suspicious use of FindShellTrayWindow
      PID:1284

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      MD5

      bcd53d5e0cf0449701730264d03659cc

      SHA1

      3f8e7e422106b9e3a8b0569c8f879c52a5196bde

      SHA256

      2da69ffa0187b1b7155fe5083fea59857159ba31aa3757e7f26df834770119a4

      SHA512

      4ad0adc78bcf6556298455a125f6c61d0d6175bd1f9297d6dd50b4dbedfc89dc51e0ecfa220b96b4150859259e428a763bc71369b809afda4587670f41e78ada

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

      MD5

      bcd53d5e0cf0449701730264d03659cc

      SHA1

      3f8e7e422106b9e3a8b0569c8f879c52a5196bde

      SHA256

      2da69ffa0187b1b7155fe5083fea59857159ba31aa3757e7f26df834770119a4

      SHA512

      4ad0adc78bcf6556298455a125f6c61d0d6175bd1f9297d6dd50b4dbedfc89dc51e0ecfa220b96b4150859259e428a763bc71369b809afda4587670f41e78ada

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

      MD5

      bcd53d5e0cf0449701730264d03659cc

      SHA1

      3f8e7e422106b9e3a8b0569c8f879c52a5196bde

      SHA256

      2da69ffa0187b1b7155fe5083fea59857159ba31aa3757e7f26df834770119a4

      SHA512

      4ad0adc78bcf6556298455a125f6c61d0d6175bd1f9297d6dd50b4dbedfc89dc51e0ecfa220b96b4150859259e428a763bc71369b809afda4587670f41e78ada

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

      MD5

      bcd53d5e0cf0449701730264d03659cc

      SHA1

      3f8e7e422106b9e3a8b0569c8f879c52a5196bde

      SHA256

      2da69ffa0187b1b7155fe5083fea59857159ba31aa3757e7f26df834770119a4

      SHA512

      4ad0adc78bcf6556298455a125f6c61d0d6175bd1f9297d6dd50b4dbedfc89dc51e0ecfa220b96b4150859259e428a763bc71369b809afda4587670f41e78ada

    • memory/824-58-0x0000000000000000-mapping.dmp

    • memory/824-68-0x0000000001FD0000-0x0000000001FD2000-memory.dmp

      Filesize

      8KB

    • memory/1136-55-0x0000000000220000-0x0000000000226000-memory.dmp

      Filesize

      24KB

    • memory/1136-57-0x0000000075981000-0x0000000075983000-memory.dmp

      Filesize

      8KB

    • memory/1136-56-0x0000000000220000-0x000000000022A000-memory.dmp

      Filesize

      40KB

    • memory/1160-62-0x0000000000000000-mapping.dmp

    • memory/1160-65-0x00000000003B0000-0x00000000003BA000-memory.dmp

      Filesize

      40KB

    • memory/1160-64-0x00000000003B0000-0x00000000003B6000-memory.dmp

      Filesize

      24KB

    • memory/1160-72-0x0000000003E31000-0x0000000004CDD000-memory.dmp

      Filesize

      14.7MB

    • memory/1284-69-0x0000000000220000-0x0000000000222000-memory.dmp

      Filesize

      8KB

    • memory/1284-70-0x0000000000410000-0x0000000000411000-memory.dmp

      Filesize

      4KB