Most likely a virus.
If you didn't have a password set, then a JSON rpc call can be made to get your seed and send a payment from a website so maybe that caused an issue somewhere...?
Without any more information on where it is and your general browsing behaviour we can't really give you much...
I had a password for the wallet but not the Json file? If you didn't have a password set, then a JSON rpc call can be made to get your seed and send a payment from a website so maybe that caused an issue somewhere...?
Without any more information on where it is and your general browsing behaviour we can't really give you much...
