"The virus, named Leap-A (also known as Oompa-A) spreads via the iChat instant messaging system, forwarding itself as a file called latestpics.tgz to contacts on the infected users' buddy list.
When the latestpics.tgz file is opened on a computer, it disguises itself with a JPEG graphic icon in an attempt to fool people into thinking it is harmless. The worm uses the text "oompa" as an infection marker in the resource forks of infected programs to prevent it from re-infecting the same files."
Click on the link below for the full article:
http://www.scmagazine.com/uk/news/article/541726/mac-os-x-new-target/
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