https://www.bleepingcomputer.com/news/security/billing-provider-billtrust-suffers-outage-after-malware-attack/

U.S. financial services provider Billtrust experienced an outage affecting all of its services after some of the company's computing systems were impacted by a malware attack on October 17.

While Billtrust did not make the attack public, a service interruption notice published by one of their customers, Wittichen Supply Company, says that the customer invoicing and online bill payment vendor notified them of a malware attack.