The Vermont Office of the Attorney General reported a data breach involving Proskauer Rose on August 18, 2023. Specific details regarding the method of the breach, date of occurrence, number of affected individuals, and types of information compromised are unknown. This breach could potentially involve sensitive information, leading to significant consequences for the company and its clients.

Clop Ransomware Group Exploits MOVEit Vulnerability, Targets Major Law Firms and Corporations A ransomware attack linked to the Clop cybercrime group has compromised several high-profile organizations, including law firms Kirkland & Ellis, Proskauer Rose, and K&L Gates, as well as entities like Ofcom, EY, PwC, Shell, and Aon. The breach stemmed from a critical SQL injection vulnerability in MOVEit Transfer, a third-party file-transfer software exploited by a hacker operating under the alias "Lance Tempest" a suspected affiliate of Clop. The attack began in late May, when Clop infiltrated MOVEit’s systems. Though the vendor released a patch shortly after, many organizations failed to apply it in time, leaving them exposed. Clop initially gave victims until June 14 to negotiate via a dark web portal, warning that non-compliance would result in public exposure of their identities. When the deadline passed, the group published the names of over 100 affected organizations, signaling their refusal or inability to engage. Unlike typical ransomware operations, Clop does not disclose fixed ransom amounts upfront. Instead, victims are directed to contact the group via email before negotiations shift to an encrypted chat on its dark web site. If no agreement is reached within three days, Clop threatens to release stolen data within a week. Cybersecurity firm Cypfer reports that the group’s demands often start at $3 million. Believed to be Russian-linked, Clop has drawn heightened scrutiny from authorities, with the U.S. government offering a $10 million bounty for information leading to the arrest of its leader. Meanwhile, the targeted law firms have not disclosed details about the compromised data, ransom demands, or their response strategies. The incident underscores the persistent threat of supply-chain attacks, particularly against law firms frequent targets due to their handling of sensitive client information. Earlier this year, a separate case involving a junior solicitor highlighted internal security risks, as she sued a firm over alleged unauthorized access to her private WhatsApp messages.

On August 18, 2023, Proskauer Rose LLP reported a data breach involving unauthorized access to personal information stored on a cloud-hosted portal, which occurred on or about April 8, 2023. The breach potentially affected personal information including names and addresses, but the exact number of individuals affected is unknown.