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Kraken Cryptor v2.2 Ransomware (<Random Filename>.<5-Digit Random Extension>)

  • Distribution Method : Unknown
  • MD5 : 9672ec48c67d4ca3ca7e09ded0a81b83
  • Major Detection Name : Win32:RansomX-gen [Ransom] (Avast), Ransom:MSIL/Kraken (Microsoft)
  • Encrypted File Pattern : <Random Filename>.<5-Digit Random Extension>
  • Malicious File Creation Location :
     - C:\ProgramData\release.bat
     - C:\ProgramData\sdelete.exe
     - C:\Users\%UserName%\AppData\Local\Temp\voice-<Encryption Extension>.vbs
  • Payment Instruction File : Instructions-<Encryption Extension>.html
  • Major Characteristics :
     - Checks OS language (Russian, Ukrainian etc.) and Geo-IP location to determine the execution.
     - Block processes execution (firefoxconfig, mydesktopqos, mydesktopservice, mysqld-opt, sqbcoreservice, sqlbrowser etc.)
     - Modifies registry "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security" to disable notification of Microsoft Security.
     - Disables System Recovery Creation point (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore\DisableSR)
     - Enables Windows AutoLogin (HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\AutoAdminLogon)
     - Disables Event Log (sc config eventlog start=disabled, sc stop eventlog) and erases (clear-log Application, clear-log Security, clear-log System)
     - Disable system restore (bcdedit /set {default} recoveryenabled No, bcdedit /set {default} bootstatuspolicy ignoreallfailures, wbadmin DELETE SYSTEMSTATEBACKUP -keepVersions:0, wmic SHADOWCOPY DELETE, vssadmin delete shadows /All)
     - Utilizes SDelete from SysInternals to purge empty disc drive space, disabling possible recovery by file recovery tool.
     - After secure erase, displays fake error message, then shuts down windows after 5 minutes (shutdown /S /F /T 300 /C "Unexpected shutdown due to maintenance break.")
     - Encryption guide using Text-to-Speech (TTS) function
     - Changes desktop background (C:\Users\%UserName%\AppData\Local\Temp\wallpaper.bmp)