Old 07-15-2008, 12:00 PM Offline   #1 (permalink)



 
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Default Thwarting New JavaScript Malware Obfuscation

I Don't Believe in Imaginary Property writes "Malware writers have been obfuscating their JavaScript exploit code for a long time now and SANS is reporting that they've come up with some new tricks. While early obfuscations were easy enough to undo by changing eval() to alert(), they soon shifted to clever use of arguments.callee() in a simple cipher to block it. Worse, now they're using document.referrer, document.location, and location.href to make site-specific versions, too. But SANS managed to stop all that with an 8-line patch to SpiderMonkey that prints out any arguments to eval() before executing them. It seems that malware writers still haven't internalized the lesson of DRM — if my computer can access something in plaintext, I can too."
Read more of this story at Slashdot.
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