Analysis

  • max time kernel
    150s
  • max time network
    122s
  • platform
    windows7_x64
  • resource
    win7-en-20211014
  • submitted
    19-11-2021 12:57

General

  • Target

    Tax Payment Challan.exe

  • Size

    592KB

  • MD5

    cca90533c2283834f8d53977f1dfde3b

  • SHA1

    579d3991a8b5f3a71d615cbd9d64832dd88db2e1

  • SHA256

    5074bfb6b468b2cd5a31acd87144e6e4a94c6073e65f506bafdb71000c16fb41

  • SHA512

    ad00919d2ba243c0d342e7073d4ec7e559670dd37cc6f3007046e06ef52b889bd6dbbe5e5a619d80756d8c3172eeb0dea265b08f3704e74e19b8c9d49253e4cc

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 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:1864
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp
      2⤵
        PID:856
      • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\jmvuioch.exe
        "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\jmvuioch.exe"
        2⤵
        • Executes dropped EXE
        • Modifies Internet Explorer settings
        • Suspicious use of SetWindowsHookEx
        PID:1120
    • C:\Windows\SysWOW64\DllHost.exe
      C:\Windows\SysWOW64\DllHost.exe /Processid:{76D0CB12-7604-4048-B83C-1005C7DDC503}
      1⤵
      • Suspicious use of FindShellTrayWindow
      PID:1428

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      MD5

      cca90533c2283834f8d53977f1dfde3b

      SHA1

      579d3991a8b5f3a71d615cbd9d64832dd88db2e1

      SHA256

      5074bfb6b468b2cd5a31acd87144e6e4a94c6073e65f506bafdb71000c16fb41

      SHA512

      ad00919d2ba243c0d342e7073d4ec7e559670dd37cc6f3007046e06ef52b889bd6dbbe5e5a619d80756d8c3172eeb0dea265b08f3704e74e19b8c9d49253e4cc

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

      MD5

      cca90533c2283834f8d53977f1dfde3b

      SHA1

      579d3991a8b5f3a71d615cbd9d64832dd88db2e1

      SHA256

      5074bfb6b468b2cd5a31acd87144e6e4a94c6073e65f506bafdb71000c16fb41

      SHA512

      ad00919d2ba243c0d342e7073d4ec7e559670dd37cc6f3007046e06ef52b889bd6dbbe5e5a619d80756d8c3172eeb0dea265b08f3704e74e19b8c9d49253e4cc

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

      MD5

      cca90533c2283834f8d53977f1dfde3b

      SHA1

      579d3991a8b5f3a71d615cbd9d64832dd88db2e1

      SHA256

      5074bfb6b468b2cd5a31acd87144e6e4a94c6073e65f506bafdb71000c16fb41

      SHA512

      ad00919d2ba243c0d342e7073d4ec7e559670dd37cc6f3007046e06ef52b889bd6dbbe5e5a619d80756d8c3172eeb0dea265b08f3704e74e19b8c9d49253e4cc

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

      MD5

      cca90533c2283834f8d53977f1dfde3b

      SHA1

      579d3991a8b5f3a71d615cbd9d64832dd88db2e1

      SHA256

      5074bfb6b468b2cd5a31acd87144e6e4a94c6073e65f506bafdb71000c16fb41

      SHA512

      ad00919d2ba243c0d342e7073d4ec7e559670dd37cc6f3007046e06ef52b889bd6dbbe5e5a619d80756d8c3172eeb0dea265b08f3704e74e19b8c9d49253e4cc

    • memory/856-68-0x00000000020B0000-0x00000000020B2000-memory.dmp

      Filesize

      8KB

    • memory/856-58-0x0000000000000000-mapping.dmp

    • memory/1120-62-0x0000000000000000-mapping.dmp

    • memory/1120-64-0x0000000000220000-0x0000000000226000-memory.dmp

      Filesize

      24KB

    • memory/1120-65-0x0000000000220000-0x000000000022A000-memory.dmp

      Filesize

      40KB

    • memory/1120-71-0x0000000003FA1000-0x0000000004E4D000-memory.dmp

      Filesize

      14.7MB

    • memory/1428-69-0x0000000000120000-0x0000000000122000-memory.dmp

      Filesize

      8KB

    • memory/1428-70-0x0000000000280000-0x0000000000281000-memory.dmp

      Filesize

      4KB

    • memory/1864-55-0x0000000000260000-0x0000000000266000-memory.dmp

      Filesize

      24KB

    • memory/1864-57-0x0000000075B71000-0x0000000075B73000-memory.dmp

      Filesize

      8KB

    • memory/1864-56-0x0000000000260000-0x000000000026A000-memory.dmp

      Filesize

      40KB