The recent spate of successful cyber attacks against high-profile organizations has focused fresh attention on the need for enterprises to implement new defenses against targeted threats.
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Last week the International Monetary Fund joined the list when it admitted to a similar intrusion.
An anonymous IMF source quoted in a story in The New York Times described the incident as a "very major breach" that likely resulted from so-called spear phishing.
All of the recent attacks have appeared to be very targeted and persistent, and carried out by adversaries using a combination of social engineering techniques and sophisticated malware programs.
Dealing with such threats requires companies to look beyond security strategies that are focused purely on dealing with traditional network threats analysts said.
Increasingly, companies also need to focus on approaches such as continuous monitoring of networks, databases, applications and users, outbound traffic filtering and white listing.
"Time and again, as details of these attacks are made clear, we find that attackers are not behaving like stereotypical burglars, smashing a window, grabbing what they want, then walking off with a big bag marked "swag" while the alarms ring," said Mike Lloyd, chief scientist with Redseal.
Instead "a common thread through many damaging incidents is targeted executables getting installed on critical servers or high value employee PCs," said John Pescatore, an analyst with Gartner.
The goal behind many of these attacks is to surreptitiously establish a persistent point of presence inside a network and use that to snoop on and steal information.
One way of dealing with such threats is by constantly monitoring for configuration changes on important assets, he said. Network forensics and database activity monitoring products such as those from FireEye and Damballa are useful in detecting and blocking targeted threats which conventional signature-based tools let through, he said.
Moving to application aware firewalls that can limit unknown application traffic over port 80 is another step forward in protection, Pescatore said.
The key to remember though is that monitoring alone is not a panacea, he said. "For most of these incidents, monitoring the right things is more important than how often you check. And protecting the right things is even more important than monitoring," Pescatore said.