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  • Distribution Method : Unknown
 
  • MD5 : e90b933f72ce5882c907a9cce13be1d2
 
  • Major Detection Name : a variant of Win32/Kryptik.GGZS (ESET), Trojan-Ransom.Win32.Purga.ml (Kaspersky)
 
  • Encrypted File Pattern : <Random Filename>.osk
 
  • Malicious File Creation Location :
     - C:\Users\%UserName%\AppData\Roaming\osk.exe
     - C:\Users\%UserName%\HOW TO RECOVER ENCRYPTED FILES.TXT
 
  • Payment Instruction File : HOW TO RECOVER ENCRYPTED FILES.TXT
 
  • Major Characteristics :
     - Offline Encryption
     - Amnesia / Scarabey Ransomware series
     - Disable and Blocks Registry Editor (regedit.exe) and Task Manager (Taskmgr.exe)
     - Block processes execution (isqlplussvc.exe, msaccess.exe, msftesql.exe, mydesktopqos.exe, mysqld-nt.exe, mysqld-opt.exe etc.)
     - Checks following folder name for encryption: Adobe, Firebird, Microsoft, Microsoft SQL Server, Microsoft SQL Server Compact Edition, MSSQL.1, Oracle
     - Disable system restore (wbadmin DELETE SYSTEMSTATEBACKUP -keepVersions:0, wmic SHADOWCOPY DELETE, vssadmin Delete Shadows /All /Quiet, bcdedit /set {default} recoveryenabled No, bcdedit /set {default} bootstatuspolicy ignoreallfailures)

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