Poison-Ivy Trojan on U.S. nuclear weapons researcher network

Attacker have used  security hole in Internet Explorer 8  to install spyware on computers of employees of the nuclear weapons research program of the U.S. Department of Energy, reported the website Nextgov.
First attacker infected an unsafe website of the U.S. Department of Labor then the employees of the nuclear weapons research program infected from infected  website.
The Trojan is a variant of the Poison Ivy toolkit that has been modified so that only a few antivirus programs can detect it.
There is no evidence internal Labor data and services were manipulated or lost, according to agency officials. "The department will continue the investigation and will ensure that appropriate precautions and safeguards remain in place to protect our information and information systems",read Nextgov
The Trojan horse is use a command-and-control protocol similar to that which has already been used by the alleged Chinese hacker group Deep Panda.
Microsoft has confirmed the vulnerability in Internet Explorer 8 and said there is not a patch and  recommends a Windows update to newer versions of Internet Explorer