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MedusaLocker Ransomware (.encrypted)

  • Distribution Method : Unknown
 
  • MD5 : 85f08d77e5b58521e2b5f06483ba8377
 
  • Major Detection Name : a variant of Win32/Kryptik.GXGG (ESET), Trojan:Win32/Conteban.B!ml (Microsoft)
 
  • Encrypted File Pattern : .encrypted
 
  • Malicious File Creation Location :
     - C:\Users\%UserName%\AppData\Local\Temp\<Random>.tmp.exe
     - C:\Users\%UserName%\AppData\Roaming\svchostt.exe
     - C:\Windows\System32\Tasks\svchostt
 
  • Payment Instruction File : HOW_TO_RECOVER_DATA.html
 
  • Major Characteristics :
     - Offline Encryption
     - Turns off User Access Control (UAC)
     - Block processes execution (httpd.exe, sqlbrowser.exe, sqlmangr.exe, tomcat6.exe, winword.exe, wxServer.exe etc.)
     - Disable system restore (vssadmin.exe Delete Shadows /All /Quiet, wmic.exe SHADOWCOPY /nointeractive, bcdedit.exe /set {default} recoveryenabled No, bcdedit.exe /set {default} bootstatuspolicy ignoreallfailures)
     - Adds svchostt to scheduler to execute "%AppData%\svchostt.exe" Every 15 minutes

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