it was an upgrade of the PC's that discovered stuxnet

from a new book about stuxnet

"When he used a DVD or CD to transfer files from an infected system to a clean one, everything was fine, he wrote. But when he used a flash drive to transfer files, the new PC started having the same problems the other machine had. A USB flash drive, of course, was Stuxnet’s primary method of spreading. Although Behrooz and his colleagues scanned for viruses, they found no malware on their machines

with Belgacom it was also a new patch or upgrade to the mailsever that made the discovery of the virus espionage tool

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