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Ars loricatus novus or A small introduction to retro-armoring

Nomenumbra
Ready Rangers Liberation Front [7]
July 2006

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Abstract

There are many ways of hiding and protecting your virus from AV analysis, ranging from metamorphism to casual anti-debugging to aggressive attacks on AV products (process termination). With time however, anything can be reversed. But this doesn't mean we can't delay them critically. By using a thick armor of anti-debugging, aggressive and passive anti-AV tricks and general stealth, we can delay analysis. Combine this with a quickly morphing virus, this would mean the virus changes it's appereance and (if it's a virus that would re-write itself on source level) it's armor. This paper will show you some techniques that can be used to Armor your virus.

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