A hacker who gained privileged access to a Canadian ISP's network hijacked net traffic from foreign networks and stole more than $83,000 in virtual currency.

The hacker, who experts believe may be a former employee of the Canadian ISP and is working alone, compromised the servers of firms that generate virtual currencies like Bitcoin and Dogecoin.  

Joe Stewart, director of malware research at Dell SecureWorks, noticed the malicious activity when he realized his personal virtual currency mining had been affected, according to a report by The Globe and Mail.

A total of 51 networks from 19 additional ISPs were hit in the attack that started in February and ended in May, according to researchers at SecureWorks.