Files with zepto file extension can be found as encrypted and renamed files affected by some of the latest versions of Locky ransomware.
ZEPTO file extension - Locky ransomware affected data
What is zepto file? How to open zepto files?
File type specification:
File extension zepto is most recently related to one of te latest versions of a ransomware previously labeled as Locky. Much like similar ransomware, it encrypts users files and demands ransom to be paid in Bitcoins.
It seems this variant is also distributed via e-mails.