Analysis

  • max time kernel
    124s
  • max time network
    121s
  • platform
    windows10_x64
  • resource
    win10-en-20211104
  • 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 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 Payment Challan.exe
    "C:\Users\Admin\AppData\Local\Temp\Tax Payment Challan.exe"
    1⤵
    • Drops startup file
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:2388
    • 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:980
      • 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:2540
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gegxwach.exe
      "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\gegxwach.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetWindowsHookEx
      PID:1332
  • \??\c:\windows\system32\svchost.exe
    c:\windows\system32\svchost.exe -k localsystemnetworkrestricted -s DeviceAssociationService
    1⤵
      PID:1512

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

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

      MD5

      cca90533c2283834f8d53977f1dfde3b

      SHA1

      579d3991a8b5f3a71d615cbd9d64832dd88db2e1

      SHA256

      5074bfb6b468b2cd5a31acd87144e6e4a94c6073e65f506bafdb71000c16fb41

      SHA512

      ad00919d2ba243c0d342e7073d4ec7e559670dd37cc6f3007046e06ef52b889bd6dbbe5e5a619d80756d8c3172eeb0dea265b08f3704e74e19b8c9d49253e4cc

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

      MD5

      cca90533c2283834f8d53977f1dfde3b

      SHA1

      579d3991a8b5f3a71d615cbd9d64832dd88db2e1

      SHA256

      5074bfb6b468b2cd5a31acd87144e6e4a94c6073e65f506bafdb71000c16fb41

      SHA512

      ad00919d2ba243c0d342e7073d4ec7e559670dd37cc6f3007046e06ef52b889bd6dbbe5e5a619d80756d8c3172eeb0dea265b08f3704e74e19b8c9d49253e4cc

    • memory/980-120-0x0000000000000000-mapping.dmp

    • memory/1332-122-0x0000000000000000-mapping.dmp

    • memory/2540-121-0x0000000000000000-mapping.dmp