Targeted Trojan emails

The threat of targeted malware attacks was discussed a few months ago in the NoticeBored Classic awareness module on malware. US-CERT Technical Cyber Security Alert is now warning of the increased threat of Trojans that (a) elude conventional protective measures such as antivirus software and firewalls, and (b) are emailed to specific targeted recipients. External disclosure (exfiltration or stealing) of data appears to be the primary purpose, for example using port 80 like normal web traffic, passing straight through the perimeter firewalls.
More anti-hacking and malware resources