Russian security outfit Kaspersky says it will continue to provide details of advanced persistent threats (APTs or nation-state actors) no matter the country of their origin, but these details will only be available to customers who subscribe to their services.

The head of the cyber security firm Dragos has played down reports of a cyber attack being behind a fire at the Abadan Oil Refinery in Iran, which were published by Reuters on Sunday.

A hitherto unknown group that has been dubbed Tortoiseshell is using both customised and common Windows malware to target IT providers in Saudi Arabia, the American security firm Symantec claims, adding that these attacks appear to be focused on the supply chain and ultimately aimed at the providers' customers.