Will a standard NAT-router firewall stop outgoing traffic?

I can see that the firewall will stop incoming traffic, but what will stop outgoing traffic in the case of malware being on the machine?

Is it the responsibility of the operating system's firewall to stop outgoing traffic?

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This is duplicated on serverfault.com/questions/154294/what-is-stopping-outgoing-traffic-using-a-stand‌​ard-nat-firewall – Grizly Jun 24 '10 at 2:59
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The hardware firewall cannot readily distinguish between "good" or "bad" packets, since they all come from the same source. The software firewall can ascertain which application generated the packet, so is better prepared to block them as desired.

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