Officers from Catalonia's Mossos police force are investigating the cyberattack which was apparently carried out by a jihadist group.
The hackers replaced the website with a screen displaying the message "Hacked by Middle Easy Cyber Attack" while Islamic prayers played in the background.
Local daily La Vanguardia quoted police sources who said that the attack could have been related to the recent spate of cyberattacks on thousands of French companies.
Others involved with the case stated that the hackers may have confused the Catalan company with the Brazilian-US weapons manufacturer of the same name.
Taurus's website was still experiencing intermittent problems on Friday.