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  • Distribution Method : Unknown
 
  • MD5 : 92b9f39260aa8104212fff4ddf1ba178
 
  • Major Detection Name : MSIL.Trojan-Ransom.Remind.B (GData), Ransom:MSIL/Filecoder.PK!MSR (Microsoft)
 
  • Encrypted File Pattern : .<4-Digit Random Extension>
 
  • Malicious File Creation Location :
     - C:\Users\%UserName%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ReadMe.txt
     - C:\Users\%UserName%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\svchost.url
     - C:\Users\%UserName%\AppData\Roaming\ReadMe.txt
     - C:\Users\%UserName%\AppData\Roaming\svchost.exe
 
  • Payment Instruction File : ReadMe.txt
 
  • Major Characteristics :
     - Offline Encryption
     - BiggyLocker / Penta Ransomware series
     - The Japanese users are targeted.
     - Disable system restore (vssadmin delete shadows /all /quiet, wmic shadowcopy delete, bcdedit /set {default} bootstatuspolicy ignoreallfailures, bcdedit /set {default} recoveryenabled no, wbadmin delete catalog -quiet)
     - Changes desktop background (C:\Users\%UserName%\AppData\Local\Temp\<Random>.jpg)

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