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Kraken Cryptor v1.6 Ransomware (<Random Filename>.<5-Digit Random Extension>)

  • Distribution Method : Unknown
  • MD5 : 09d3bd874d9a303771c89385d938c430
  • Major Detection Name : Generic.Ransom.KrakenB.923510A9 (BitDefender), Ransom:MSIL/Kraken.B (Microsoft)
  • Encrypted File Pattern : <Random Filename>.<5-Digit Random Extension>
  • Malicious File Creation Location :
     - C:\ProgramData\release.bat
     - C:\ProgramData\sdelete.exe
  • Payment Instruction File : # How to Decrypt Files-<Encryption Extension>.html
  • Major Characteristics :
     - Offline Encryption
     - 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.)
     - 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.")