Hackers attack major Global Companies.

Hackers launched attacks on Tuesday against companies and agencies around the world. The source of the attack is not yet confirmed but researchers say the attackers used a Windows flaw called Eternal Blue to spread it through corporate networks.

Big Global firms like British advertising agency WPP (WPPGY), Russian oil and gas giant Rosneft and Danish shipping firm Maersk. "IT systems in several WPP companies have been affected including U.S.-based pharmaceutical firm Merck (MRK).

PICTURE: softpedia.