thousands of Macusers installed a botnet because they wanted pirated software

this explains why they did ignore all the alerts that were popped up before them

"The weekend also yielded more research that showed The Pirate Bay likely played a big role in the propagation of iWorm on affected machines. Acting on a tip from a different anonymous researcher, the independent researcher Thomas Reed confirmed on his The Safe Mac blog that the iWorm installer was found in a pirated Photoshop install package modified to hide the malicious executable. In his tests, Reed found that he first had to override the Apple Gatekeeper restrictions, which warns users installing the malicious executable that the application they are attempting to run contains unsigned code. However, this warning message would likely do nothing to deter users knowingly installing pirated software; they would expect the contraband software to be modified to get around anti-piracy measures

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