The malware was called "NotPetya," referring to the ransomeware family Petya, which disables computer systems and demands a ransom to be paid in bitcoin before it will restore access to a company's files. It is destructive and costly, something Merck was to find out as its sales and manufacturing operations were disrupted by the June 7th attack. According to the Wall Street Journal, the incident cost the pharmaceutical giant $670 million to remediate, but more importantly, it caused disruption to the production of two of Merck's pediatric vaccines: Gardasil 9 (Human Papillomavirus) and Recombivax (Hepatitis B virus), vaccines to help prevent sexually transmitted infections.