Sourcefire, the creator of Snort® and a leader in intelligent cybersecurity solutions, recently announced the acquisition of Immunet, a leading provider of advanced cloud-based anti-malware technologies. The acquisition expands Sourcefire’s security solutions portfolio – adding an advanced cloud platform for delivery of malware protection - and extending the company’s real-time detection and prevention leadership to the cloud.

“Immunet is a disruptive innovator in delivering cloud-based security solutions with over 750,000 users in 192 countries,” said John Burris, CEO of Sourcefire. “This acquisition enables Sourcefire to accelerate our cloud initiatives and provides significant value to customers by protecting them against advanced client-side attacks. Immunet’s technologies build upon Sourcefire’s reputation for providing customers with innovative solutions that protect them from the latest threats.”

Sourcefire will retain all fulltime Immunet personnel, including founders Oliver Friedrichs, Alfred Huger and Adam O’Donnell. Immunet employees will join Sourcefire within the Office of the CTO.

The total acquisition price is $21 million in cash, which included $17 million paid at closing and $4 million expected to be paid over the next 18 months upon achievement of product delivery milestones related to the enterprise version of Immunet’s product.

Immunet has a subscription-based business model and is expected to grow bookings at a rapid pace in 2011, though its contribution to revenue is expected to be minimal over the same time period.