A ransomware attack against the City of Columbus, Ohio—which drew public scrutiny following the city government’s attempt to silence a researcher who told the public about the attack—has received a little more detail from an unexpected source: The Attorney General for the state of Maine.

In a data breach notification filed by the Attorney General for the state of Maine, the cybersecurity incident that affected Columbus, Ohio impacted half a million people.

The City of Columbus was attacked by a ransomware group on July 18, 2024. Due to the timing, it was at first unclear whether the disruption in the public facing services was caused by the CrowdStrike incident or if it was in fact an attack. The attack was later claimed by the Rhysida ransomware group on their leak site, where the group posts information about victims that are unwilling to pay.

On September 12, 2024, the city of Columbus issued a notice of breach that was sent to its clients. The notice reads:

“On July 18, 2024, the city discovered that it had experienced a cybersecurity incident in which a foreign cyber threat actor attempted to disrupt the City’s IT infrastructure, in a possible effort to deploy ransomware and solicit a ransom payment from the City.”

Until now, though, the public at large did not know how many people were affected by the attack. Because of the data breach notification from Maine’s Attorney General, that number now has a little more clarity.

During the incident, the cybercriminals may have gained access which included data in connection to the Columbus City Auditor.

The City Auditor’s Office examines City operations to identify an opportunity to reduce costs, increase efficiency, quality and effectiveness, or otherwise improve management of a city function, program, service or policy.

According to the official statement, the ransomware group was also able to view and access certain sensitive personal information, which may have included first and last name, date of birth, address, bank account information, City employee account number and position, City employment and payroll records, Social Security Number (SSN), and other identifying information.

Later, a security researcher disclosed information about the content of the stolen data with the media. From what the researcher shared it became clear that the data contained unencrypted personal information not only of city employees but also residents.

At which point the City of Columbus decided to sue the researcher for alleged damages for criminal acts, invasion of privacy, negligence, and civil conversion. With half a million affected people, it like safe to say the attack did not just impact City employees.

Protecting yourself after a data breach

There are some actions you can take if you are, or suspect you may have been, the victim of a data breach.

• Check the vendor’s advice. Every breach is different, so check with the vendor to find out what’s happened, and follow any specific advice they offer.
• Change your password. You can make a stolen password useless to thieves by changing it. Choose a strong password that you don’t use for anything else. Better yet, let a password manager choose one for you.
• Enable two-factor authentication (2FA). If you can, use a FIDO2-compliant hardware key, laptop or phone as your second factor. Some forms of two-factor authentication (2FA) can be phished just as easily as a password. 2FA that relies on a FIDO2 device can’t be phished.
• Watch out for fake vendors. The thieves may contact you posing as the vendor. Check the vendor website to see if they are contacting victims, and verify the identity of anyone who contacts you using a different communication channel.
• Take your time. Phishing attacks often impersonate people or brands you know, and use themes that require urgent attention, such as missed deliveries, account suspensions, and security alerts.
• Consider not storing your card details. It’s definitely more convenient to get sites to remember your card details for you, but we highly recommend not storing that information on websites.
• Set up identity monitoring. Identity monitoring alerts you if your personal information is found being traded illegally online, and helps you recover after.

If you want to find out what personal data of yours has been exposed online, you can use our free Digital Footprint scan. Fill in the email address you’re curious about (it’s best to submit the one you most frequently use) and we’ll send you a free report.

We don’t just report on threats – we help safeguard your entire digital identity

Cybersecurity risks should never spread beyond a headline. Protect your—and your family’s—personal information by using identity protection.