Worm sleeps to avoid detection - News - ZDNet:
"The latest mass-mailing worm, Atak, hides by going to sleep when it suspects that antivirus software is trying to detect it.
Atak was first discovered Monday. Although antivirus companies do not expect it to cause much damage, they say it will be a nuisance because it can generate a large amount of spam.…"
"Atak tries to tell when someone is stepping through the code to analyze whether it is a virus or not. Often, a virus will contain lots of code that is designed to make it more complicated for (antivirus) companies to write the detections,"Graham Cluley, senior technology consultant for antivirus company Sophos said.…
http://zdnet.com.com/2100-1105-5267258.html
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