Its Micros system Oracle, which you have probably used to pay for something by debit or credit card has been breached.
At present, it is not yet known how big the data is, but a source told the researcher Krebs journalist that 700 systems may have been affected. 
A team hacker group known as the Carbanak Gang (referred to by Krebs as "a Russian organized cybercrime group" as it has been accused of stealing more than $1 billion from banks and retailers over the past few years) is believed to be responsible for the breach.
Oracle acknowledged the hack, saying "malicious code was detected on some Microsoft systems" and asked its customers to change the passwords associated with the MICROS point-of-sale.
Researchers believe the breach started on a single system on Oracle's internal network, and spread through a Micros "ticket gateway" that usesfor customer assistance.
From there, the hackers were able to steal usernames and passwords from them users of Micros, when connecting to the Web portal, to check the response tickets or to manage their accounts.
It is not known how it can affect this hack. The most likely scenario is that hackers have gained access to the micros to put point-of-sale malware and steal credit card information.
Oracle is still investigating the violation but has not yet announced how deeply the hackers have reached.
