French energy conglomerate Areva may have been hit by an attack first detected in September.
"Local reports are consistent only in terms of talking about cyber-espionage, perhaps involving malware rather than some kind of terrifying Stuxnet-style nuclear kit sabotage caper," writes The Register's John Leyden.
"Staff reportedly learned that all might not to be well with Areva systems in mid-September, following a weekend security upgrade that left some systems out of action for three days," Leyden writes. "The National Security Agency Information Systems (ANSSI) reportedly assisted the security upgrade."
Go to "French nuke biz slapped in mystery cyberattack" to read the details.
For regular security news updates, follow eSecurityPlanet on Twitter: @eSecurityP.