Kelihos botnet still dead, say Microsoft, Kaspersky

06 Feb 2012

By: Gregg Keizer, Computerworld

Computerworld - Contrary to reports, the Kelihos botnet has not crawled out of the grave, Microsoft said last week. But the company acknowledged that a new botnet is being assembled using a variant of the original malware.

The reappearance of a Kelihos-like army of hijacked computers shows just how difficult it is to eradicate a botnet, security experts said today.

"It's not possible in most cases," said Roel Schouwenberg, a senior researcher with Moscow-based antivirus company Kaspersky Lab, when asked whether killing a botnet was feasible. "What you're going for is disruption more than anything."