Credit card breach that hit Jimmy John's is larger than originally thought

An additional 108 restaurants were also affected, said credit-card processor Signature Systems

Signature Systems says the breach of its point-of-sales system that hit 216 Jimmy John's sandwich shops is actually 50 percent larger than originally thought.

The company said Friday that an additional 108 restaurants that use its payment terminals were also hit. The additional locations are independent restaurants not part of the Jimmy John's chain.

The breach is thought to have begun on June 16 when someone began gaining access to the terminals through a user name and password that are normally used to remotely manage the devices. Companies like Signature Systems use remote management so they don't have to send a technician to each store, saving time and money but also opening the devices up to just the sort of attack that happened.

It wasn't until July 30 that the company first learned there could be a problem. It took a week for the malware to be removed from most terminals, although it wasn't completely gone from just about all until mid-September. At some restaurants, the company still hasn't verified that the malware has been removed, but says the attack has been blocked.

The malware installed was capable of stealing the cardholder's name, card number, expiration data and verification code from the magnetic stripe on the back of the card.

Cards used at the affected locations in a three-month period from mid-June were potentially at risk of being compromised. The company has posted a list of all independent restaurants and the time frames in question on its website, and there's a similar list on the Jimmy John's website.

It shows, for example, that at the Roman Delight restaurant in Southampton, Pennsylvania, the malware was present for just four days in mid-June, while at Apollo Pizza in Philadelphia, the malware was present for three months.

The bad news for consumers is that Signature Systems says it's unable to identify the specific cards that were stolen, so it doesn't know the names and addresses of potential victims. The company is asking customers who used payment cards at the restaurants to watch for fraudulent charges and notify their bank if they appear.

Martyn Williams covers mobile telecoms, Silicon Valley and general technology breaking news for The IDG News Service. Follow Martyn on Twitter at @martyn_williams. Martyn's e-mail address is

Join the CSO newsletter!

Error: Please check your email address.

Tags Signature Systemssecuritydata breachmalware

More about ApolloIDGNews

Show Comments

Featured Whitepapers

Editor's Recommendations

Solution Centres

Stories by Martyn Williams

Latest Videos

  • 150x50

    CSO Webinar: The Human Factor - Your people are your biggest security weakness

    ​Speakers: David Lacey, Researcher and former CISO Royal Mail David Turner - Global Risk Management Expert Mark Guntrip - Group Manager, Email Protection, Proofpoint

    Play Video

  • 150x50

    CSO Webinar: Current ransomware defences are failing – but machine learning can drive a more proactive solution

    Speakers • Ty Miller, Director, Threat Intelligence • Mark Gregory, Leader, Network Engineering Research Group, RMIT • Jeff Lanza, Retired FBI Agent (USA) • Andy Solterbeck, VP Asia Pacific, Cylance • David Braue, CSO MC/Moderator What to expect: ​Hear from industry experts on the local and global ransomware threat landscape. Explore a new approach to dealing with ransomware using machine-learning techniques and by thinking about the problem in a fundamentally different way. Apply techniques for gathering insight into ransomware behaviour and find out what elements must go into a truly effective ransomware defence. Get a first-hand look at how ransomware actually works in practice, and how machine-learning techniques can pick up on its activities long before your employees do.

    Play Video

  • 150x50

    CSO Webinar: Get real about metadata to avoid a false sense of security

    Speakers: • Anthony Caruana – CSO MC and moderator • Ian Farquhar, Worldwide Virtual Security Team Lead, Gigamon • John Lindsay, Former CTO, iiNet • Skeeve Stevens, Futurist, Future Sumo • David Vaile - Vice chair of APF, Co-Convenor of the Cyberspace Law And Policy Community, UNSW Law Faculty This webinar covers: - A 101 on metadata - what it is and how to use it - Insight into a typical attack, what happens and what we would find when looking into the metadata - How to collect metadata, use this to detect attacks and get greater insight into how you can use this to protect your organisation - Learn how much raw data and metadata to retain and how long for - Get a reality check on how you're using your metadata and if this is enough to secure your organisation

    Play Video

  • 150x50

    CSO Webinar: How banking trojans work and how you can stop them

    CSO Webinar: How banking trojans work and how you can stop them Featuring: • John Baird, Director of Global Technology Production, Deutsche Bank • Samantha Macleod, GM Cyber Security, ME Bank • Sherrod DeGrippo, Director of Emerging Threats, Proofpoint (USA)

    Play Video

  • 150x50

    IDG Live Webinar:The right collaboration strategy will help your business take flight

    Speakers - Mike Harris, Engineering Services Manager, Jetstar - Christopher Johnson, IT Director APAC, 20th Century Fox - Brent Maxwell, Director of Information Systems, THE ICONIC - IDG MC/Moderator Anthony Caruana

    Play Video

More videos

Blog Posts