Suspected North Korean hackers have tried to break into the systems of British drugmaker AstraZeneca in recent weeks, two people with knowledge of the matter told Reuters, as the company races to deploy its vaccine for the COVID-19 virus. Report informs citing the Reuters.

The hackers posed as recruiters on networking sites LinkedIn and WhatsApp to approach AstraZeneca staff with fake job offers, the sources said. They then sent documents purporting to be job descriptions laced with malicious code designed to gain access to a victim’s computer.

The hacking attempts targeted a “broad set of people,” including staff working on COVID-19 research, said one of the sources, but are not thought to have been successful.