Jones Day executives in 2019 open the trading day during a Bell Ceremony to celebrate Jones Dayâs 30 years of presence in Brussels. A ransomware attack on software company Accellion led to the compromise and eventual leak of confidential client data from the law firm. (Euronext) Large data breaches are typically boom times for the lawyers, called upon to control the bleeding and manage the fallout. But the same law firms tasked with minimizing client liability, and providing auditing and insurance underwriting, grapple with risk from a breach of their own systems and data. Indeed, as companies scramble to assess their own vulnerability amid the wave of supply chain attacks in recent months, law firms find themselves doing double duty: providing complex legal support to clients, and assessing internal safeguards to ensure they themselves practice what they preach.