Criminal cyber gangs must be harried, hounded and hunted until they're driven out of business, a noted botnet researcher said today as he prepared to pitch a new antimalware strategy later this week at the RSA Conference in San Francisco.

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"We need a new approach to fighting cybercrime," said Joe Stewart, the director of SecureWorks Inc.'s counter-threat unit. "What we're doing now is not making a significant dent."

Rather than pursue malware makers the old-fashioned way -- a tack Stewart argued is haphazard, at best -- he said that teams of paid security researchers should be created to stalk and disrupt specific criminal gangs or botnets. Set up like a police department's major crimes unit or a military special operations team, the researchers would take a long-term view, get to know their target, perhaps even infiltrate the group responsible for the botnet and employ a spectrum of disruptive tactics.

"Criminals are operating with the same risk-effort-reward model of legitimate businesses," said Stewart. "If we really want to dissuade them, we have to attack all three of those. Only then can we disrupt their business."

Researchers have had some success, said Stewart, who cited last November's takedown of McColo Corp., a hosting company that was harboring the command-and-control servers for several large botnets, as an one example. The creation of the Conficker Working Group, a consortium of companies and organizations that has worked to keep that worm's makers from communicating with infected PCs, is another.

"McColo didn't take all the botnets out," said Stewart, who was instrumental in identifying the botnets controlled by McColo-hosted systems, "even though some, like Srizbi, suffered. But even though Srizbi didn't really come back, [it's authors] are back up and running another bot. It's much less sophisticated, and just one-tenth the size, but they're back."

To affect a botnet, and the criminal group behind it, Stewart believes that small, independent teams must focus on just that one malware family. "These small groups would have a long-term focus on just one criminal group or botnet, and employ every tactic that they can come up with," he said.

Current tactics, such as taking down a command-and-control server or building spam filtering lists, are not enough, Stewart argued. "We need to keep doing them, over and over again," he said.

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