According to NSS Labs, malicious software entering from one end, though potentially blocked there, often remains undetected with the help of EPPs (Endpoint Protection Products) when it enters from other ends like a server for network file or a drive meant for USBs.
Said Chief Executive Officer Rick Moy at NSS Labs, his organization's researchers uncovered that the same malicious program wasn't necessarily caught when it was thrust to the system via multiple entrances. He explained that when malware was detected while doing Web-surfing, it could pass off undetected via the same anti-malware software incase the software resided on any file share, a USB, alternatively was e-mailed. Infosecurity.com published this on March 11, 2011.
Reportedly, during the experiments at NSS, hardly any security application scrutinized or removed worms within e-mails prior to downloading of the messages; however, they did scrutinize once the messages landed on the computer.
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