The virus, called Worm Mydoom M, attaches to files and then transmits via e-mail to addresses found on the infected machines, according to experts at the Tianjin-based National Computer Virus Emergency Response Centre.
The virus is disguised as an announcement of an e-mail sending failure.
If the virus gets into a computer, it sets up and modifies certain system files and creates a so-called back-door, a programme that sits on the affected computer to
damage files contacted, according to the centre, the only anti-virus products testing and certification institution authorised by the Chinese ministry of public security.