Hackers demanded about $5 million in bitcoin from Mexico’s Pemex, they told Reuters on Tuesday, saying the state oil firm missed a special discount by not paying immediately after a cyberattack that fouled up the company’s systems. The hack, which Pemex said it detected on Sunday, forced the company to shut down computers across Mexico, freezing systems such as payments, according to five employees and internal emails. Hackers have increasingly targeted companies with malicious programs that can cripple systems overseeing everything from supply chains to manufacturing, removing them only after receiving substantial ... (full story)