Czech-based Avast and Czech counterintelligence service BIS said on Monday 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. The BIS said in a statement that – with contribution from foreign partners – it detected a threat to products of Avast, a company founded in the Czech Republic.