LONDON (AP) — The discovery of a group of servers linked to an elusive espionage campaign is providing new details about a high-tech piece of spy software that some fear may be targeting dissidents living under oppressive regimes.

A Canadian research center said Wednesday that it had identified 25 different countries that host servers linked to FinFisher, a Trojan horse program which can dodge anti-virus protections to steal data, log keystrokes, eavesdrop on Skype calls, and turn microphones and webcams into live surveillance devices.