Files with btc file extension can be also found as encrypted and renamed files affected by the Jigsaw ransomware.
There is one other file type using
the BTC file extension!
.btc - Becker Tools compressed archive
BTC file extension - Jigsaw Ransomware affected data
What is btc file? How to open btc files?
File type specification:
The btc file extension is also related to a ransomware labeled as Jigsaw. Much like similar ransomware it encrypts users files and demands ransom to be paid in bitcoins.
This particular ransomware masks itself as Firefox executable and process.