There’s a “vigilante” malware campaign stalking the digital streets, with an apparent grudge against pirating websites and their patrons.

It does this in a pretty crude, simplistic way: by hijacking the computer’s HOSTS file, which is the plaintext file in computers that maps hostnames to IP addresses as they connect to a device’s network.

Andrew Brandt, lead researcher with Sophos, said that the malware’s “motivation seemed pretty clear.” That is, it “prevents people from visiting software piracy websites (if only temporarily),” Brandt writes.

Also, it’s apparently really easy to disable the effects of the malware, and thus re-access the websites you were previously trying to reach: “Anyone can remove the entries after they’ve been added to the HOSTS file, and they stay removed (unless you run the program [i.e., the virus] a second time),” writes Brandt.