Analysis

  • max time kernel
    142s
  • max time network
    170s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220112
  • submitted
    01-02-2022 02:19

General

  • Target

    c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9.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 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Sets service image path in registry 2 TTPs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • 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 data under HKEY_USERS 41 IoCs
  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of SetWindowsHookEx 16 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9.exe
    "C:\Users\Admin\AppData\Local\Temp\c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9.exe"
    1⤵
    • Drops startup file
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:700
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c C:\Users\Admin\AppData\Local\Temp\NewBitmapImage.bmp
      2⤵
      • Checks computer location settings
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:2720
      • 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:3652
    • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\avffqdch.exe
      "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\avffqdch.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetWindowsHookEx
      PID:3944
  • C:\Windows\System32\WaaSMedicAgent.exe
    C:\Windows\System32\WaaSMedicAgent.exe f7d67dc6c46a842ea90747b9424e3464 BGQEXfaXXUSNy+AvXw5Ntg.0.1.0.0.0
    1⤵
    • Modifies data under HKEY_USERS
    PID:3408

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

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

    MD5

    7179c01d287ea46e21056c636762968e

    SHA1

    a415e62ffb1aa36634d5829e4860440f98623358

    SHA256

    c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9

    SHA512

    875034e75889847861f603afada2ea5a7ebc1058e84dea5759dd8528055ad48cfd2b64bca3109721ccc2a16f171b8368649603955d69583380ec1400e5b34dfc

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

    MD5

    7179c01d287ea46e21056c636762968e

    SHA1

    a415e62ffb1aa36634d5829e4860440f98623358

    SHA256

    c1a4f8840c7d3c16fa5bb0b52507a501da19dff827fff7b64778f24726d8d5c9

    SHA512

    875034e75889847861f603afada2ea5a7ebc1058e84dea5759dd8528055ad48cfd2b64bca3109721ccc2a16f171b8368649603955d69583380ec1400e5b34dfc