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MedusaLocker Ransomware (.frlock)

  • Distribution Method : Unknown
  • MD5 : b66384a34452aea03b6f53e0265f54e4
  • Major Detection Name : TR/AD.MedusaRansom.yvkui (Avira), Generic.Ransom.MedusaLocker.942644D7 (BitDefender)
  • Encrypted File Pattern : .frlock
  • Malicious File Creation Location :
     - C:\Users\%UserName%\AppData\Roaming\svhost.exe
     - C:\Windows\System32\Tasks\svhost
  • Payment Instruction File : Recovery_Instructions.html
  • Major Characteristics :
     - Offline Encryption
     - EFI System Partition (X:\) and Recovery Partition (Y:\) drives are activate.
     - Turns off User Access Control (UAC)
     - Block processes execution (360doctor.exe, Culture.exe, MsDtSrvr.exe, RTVscan.exe, sqlservr.exe, tomcat6.exe etc.)
     - Stop multi services (ccEvtMgr, Culserver, QuickBooks, SQLADHLP, sqlservr, vmware-converter etc.)
     - Disable system restore (vssadmin.exe Delete Shadows /All /Quiet, bcdedit.exe /set {default} recoveryenabled No, bcdedit.exe /set {default} bootstatuspolicy ignoreallfailures, wbadmin DELETE SYSTEMSTATEBACKUP, wbadmin DELETE SYSTEMSTATEBACKUP -deleteOldest, wmic.exe SHADOWCOPY /nointeractive)
     - Adds svhost to scheduler to execute "%AppData%\svhost.exe" Every 15 minutes.