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Complex malware known as Regin is the suspected technology behind sophisticated cyberattacks conducted by US and British intelligence agencies on the European Union and a Belgian telecommunications company, according to security industry sources and technical analysis conducted by The Intercept.

Regin was found on infected internal computer systems and email servers at Belgacom, a partly state-owned Belgian phone and internet provider, following reports last year that the company was targeted in a top-secret surveillance operation carried out by British spy agency Government Communications Headquarters, industry sources told The Intercept.

The malware, which steals data from infected systems and disguises itself as legitimate Microsoft software, has also been identified on the same European Union computer systems that were targeted for surveillance by the National Security Agency.

The hacking operations against Belgacom and the European Union were first revealed last year through documents leaked by NSA whistle-blower Edward Snowden. The specific malware used in the attacks has never been disclosed, however.

The Regin malware, whose existence was first reported by the security firm Symantec on Sunday, is among the most sophisticated ever discovered by researchers. Symantec compared Regin to Stuxnet, a state-sponsored malware program developed by the U.S. and Israel to sabotage computers at an Iranian nuclear facility. Sources familiar with internal investigations at Belgacom and the European Union have confirmed to The Intercept that the Regin malware was found on their systems after they were compromised, linking the spy tool to the secret GCHQ and NSA operations.

Ronald Prins, a security expert whose company Fox IT was hired to remove the malware from Belgacom’s networks, told The Intercept that it was “the most sophisticated malware” he had ever studied.

Having analysed this malware and looked at the [previously published] Snowden documents, Prins said, I’m convinced Regin is used by British and American intelligence services — via redwolf.newsvine.com