Lawrence Abrams for Bleeping Computer: Reyptson Ransomware Spams Your Friends by Stealing Thunderbird Contacts. He says:
‘…unfortunately there is no way to decrypt this ransomware currently for free. We have, though, setup a dedicated Reyptson Support & Help Topic for those who wish to discuss it or ask questions.’
Announcement by EMSIsoft’s @PolarToffee.
Notes from @malwrhunterteam