Chinese Hackers Target Czech Company Avast, Authorities Say

A student from an engineering school attends the first edition of the Steria Hacking Challenge in Meudon, Paris on March 16, 2013. Thomas Samson/AFP/Getty Images

PRAGUE—Czech-based Avast and Czech counterintelligence service BIS said on Oct. 21 they had detected a network attack on the cyber-security company which the BIS suspected of originating in China.

Avast said in a blog post that it found suspicious behavior on its network on Sept. 23 and opened an investigation involving the BIS and Czech police along with an external forensics team.