Orange Belgium on Wednesday announced 850,000 customer accounts were impacted by a July data breach.
The telecoms company said it identified the incident in late July, and it immediately activated its response plan and notified the relevant authorities.
“At the end of July, Orange Belgium detected a cyberattack on one of its IT systems, resulting in unauthorized access to certain data from 850,000 customer accounts,” the company said in an August 20 notice.
The compromised information, it says, includes names, phone numbers, SIM card numbers, PUK codes, and tariff plans. However, no addresses, email addresses, passwords, or financial information was compromised.
“As soon as the incident was detected, our teams blocked access to the affected system and tightened our security measures. Orange Belgium also alerted the competent authorities and filed an official complaint with the judicial authorities,” the telecom provider said.
Orange Belgium says it has notified the impacted customers via email or text messages, urging them to remain vigilant for phishing and other unwanted communication.
Responding to a SecurityWeek inquiry, Orange Belgium confirmed that it knows the identity of the hacking group, but did not disclose it, citing its ongoing investigation.
The incident occurred around the same time that Orange Group disclosed a July 25 cyberattack that resulted in the disruption of some management services and platforms, impacting some of the company’s business and consumer customers in France. Orange Group said at the time that it had no evidence of customer information being compromised.
Both Orange and Orange Belgium have confirmed to SecurityWeek that the two incidents are not related. Orange refrained from sharing further details on the cyberattack that impacted the Orange Group in France.
A ransomware group named WarLock last week claimed to have stolen data from Orange. Some of the files made public by the hackers suggest that the compromised data pertains to France.
*Updated with additional information from Orange and Orange Belgium.
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