A leading antivirus software provider has revealed its own systems were recently compromised by hackers.
Kaspersky Lab believes the attack was designed to spy on its newest technologies and said the intrusion involved up to three unknown techniques.
The firm is continuing to carry out checks but believe they detected the intrusion early on.
Although it acknowledged that the attackers had managed to access files, it said the data it had seen was "in no way critical to the operation" of its products.
Eugene Kaspersky, chief executive of Kaspersky Lab said: "Spying on cybersecurity companies is a very dangerous tendency.
"The only way to protect the world is to have law enforcement agencies and security companies fighting such attacks openly.
"We will always report attacks regardless of their origin."
Kaspersky linked the attack to the unidentified creators of an earlier Trojan named Duqu and detected the breach back in "early spring" this year. It described it as "one of the most sophisticated campaigns ever seen".
The malware is said to reside in affected computers' memory, making it relatively hard to detect.
Director of Kaspersky Lab's global research and analysis team Costin Raiu said: "This highly sophisticated attack used up to three zero-day [previously unknown] exploits, which is very impressive - the costs must have been very high.
He also warned that the firm had evidence that "Duqu2.0" attacks had also been made on other targets, including several venues used for talks between Iran and The West about Iran's nuclear programme.
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