Meanwhile, Symantec Senior Security Response Engineer Peter Ferrie updated the Symantec Malicious Code blog with some extra details about the virus. Ferrie says the malware "exploits no flaws in the CPU," and that it "[uses] a designed-in feature of the operating system in a slightly unusual way; however, it completely conforms to the specification." In the blog, Ferrie adds that the virus also affects Intel's x86-64 (a.k.a. EM64T) processors, but that Itanium chips are immune. Once again, though, the virus is only a proof of concept and has not been widely distributed.