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MedusaLocker Ransomware (.lockfiles / Recovery_Instructions.html)

  • Distribution Method : Remote access through Remote Desktop Protocol(RDP) or Terminal Services
  • MD5 : 06ff220aea6c9e27fd1765f25b9e27fb
  • Major Detection Name : Trojan.Ransom.MedusaLocker (ALYac), Generic.Ransom.MedusaLocker.942644D7 (BitDefender)
  • Encrypted File Pattern : .lockfiles
  • 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 (360se.exe, QBCFMonitorService.exe, RAgui.exe, sqlmangr.exe, winword.exe, ZhuDongFangYu.exe etc.)
     - Delete multi services (Culserver, RTVscan, sqlagent, sqlbrowser, sqlservr, sqlwriter 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.