Telefonica, the owner of O2’s UK network, has confirmed it has been hit by a cyber attack.
The Spanish mobile operator said it detected a cyber security incident on Friday May 12 which was affecting the PCs of some employees within its internal corporate network.
This was one part of the same attack that affected a number of NHS organisations.
Telefónica said it immediately activated its security protocols for the incident to resolve the problem as soon as possible.
Ransomware is the reported method of attack the company has been struck with. This stops a PC user from using their computer and holds its files “ransom” until money is paid to unlock it.
The National Crime Agency has warned victims of these attacks not to pay because “there is no guarantee files will be restored”.
Earlier this year O2 joined forces with security solutions firm BAE systems to help defend its businesses customers from cyber crime.
At the time, Billy D’Arcy, managing director of enterprise and public sector business of Telefonica O2 UK, said: “The ever-changing cyber landscape means businesses need to be at the forefront of security research and development to help protect their customers in the best way possible.”
He said the partnership would enable O2 to help customers mitigate risk, prevent fraud and provide more security for their own customers.