The first virus attacked Mac OS X

Apple's operating system became the target of an attack software called Leap.A, via the instant messaging service iChat IM.

The virus automatically forwards its copy as a file called 'latestpics.tgz' to the messaging addresses it finds in the contacts of the infected device. If the recipient opens this file, the virus will be activated and begins to install under the 'shell' disguise as a harmless Jpeg icon.

British security firm Sophos said Leap.A originated from a site of Apple operating system users. It is disguised as an upgrade software. Although this virus is not very dangerous, it still marks the first time a true attack program aimed at the old operating system which is considered 'pure'.

However, according to Graham Cluley, chief technology officer of Sophos, this may still be just proof-of-concept software: 'Some Mac OS X users believe the operating system. This can't be virus but Leap.A will make them think again '. The expert added that some Mac users still claim Leap.A is not a real threat because it requires clicking on a link. However, Cluley emphasized that the explanation was ridiculous because many viruses now spread by the user's interaction such as clicking on the link in e-mail or on IM.

PK