In August this year Qihoo 360 Technology, an anti-virus software company, launched a competing search engine.

BBC: Baidu's logo

Symantec is improving its automatic detection system by improving its heuristic engine, which evaluates program behaviors to identify potential virus risks.

CNN: Protect yourself from the next Melissa

The teams modified the virus binaries in order to change the signature, and several of the teams used a technique called "dropping, " in which a virus is injected into an already-running application and bypasses the heuristics engine.

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