Updated on October 27, 2026
On June 29, 2024, Patelco Credit Union — one of the largest credit unions on the U.S. West Coast, with nearly 500,000 members in California — was hit by a ransomware attack attributed to the RansomHub group. To contain the spread, the institution voluntarily shut down its core systems, and the consequences were felt for weeks: online banking, the mobile app, and the call center all went offline, as reported by BleepingComputer and by The Record.
For approximately 16 days, from June 29 to July 15, according to the Pleasanton Weekly, members were unable to make transfers, view balances, receive direct deposits, or pay bills. Debit and credit transactions were severely limited. Patelco later notified approximately 726,000 people that their personal data had been exposed: names, Social Security numbers, driver's license numbers, dates of birth, and email addresses. The incident led to class-action lawsuits, closed with a $7.25 million settlement (Cordell et al. v. Patelco Credit Union).
The point that matters to any business leader isn't the size of Patelco — it's the time. Sixteen days without critical systems destroys customer trust and drains the cash flow of any company, in any industry. The question is no longer "was I attacked?" — it becomes "how long will I be down when it happens?"
Could your company operate with its core systems shut down for two weeks?
The difference between a scare that lasts a few hours and a shutdown that drags on for weeks rarely comes down to whether you were breached. It comes down to how well you prepared for what happens next: tested, isolated backups that ransomware can't encrypt, a rehearsed disaster recovery plan, continuous detection and response to contain the attack in the first few hours, and business continuity that keeps essential operations running while IT recovers. Without all of these in place, a single incident can turn into weeks of degraded operations. Companies that treat recovery as routine rather than improvisation cut days down to hours.
References
- BleepingComputer — Patelco notifies 726,000 customers of ransomware data breach
- The Record: Ransomware attack on Patelco Credit Union causes confusion ahead of holiday weekend
- SecurityWeek: Patelco Credit Union Says Breach Impacts 726k After Ransomware Gang Auctions Data
Frequently asked questions
How long was Patelco Credit Union offline due to the ransomware attack?
Patelco Credit Union was offline for approximately 16 days, from June 29 to July 15, 2024.
What does the article suggest is key to avoiding a weeks-long outage?
The article suggests that tested, isolated backups, a rehearsed disaster recovery plan, 24/7 detection and response, and business continuity measures are key to shrinking days into hours.