A free tool released Thursday allows users to scan their computers for surveillance malware that has been used in attacks against journalists, human rights defenders and political activists around the world.

The open-source tool is called Detekt and was developed by security researcher Claudio Guarnieri. It was released in partnership with Amnesty International, Digitale Gesellschaft, the Electronic Frontier Foundation and Privacy International.

Detekt scans computers for infection patterns associated with several families of remote access Trojans (RATs): DarkComet RAT, XtremeRAT, BlackShades RAT, njRAT, FinFisher FinSpy, HackingTeam RCS, ShadowTech RAT and Gh0st RAT.

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