Security researchers have developed a new type of malicious rootkit software that hides itself in an obscure part of a computer's microprocessor, hidden from current antivirus products.

Called a System Management Mode (SMM) rootkit, the software runs in a protected part of a computer's memory that can be locked and rendered invisible to the operating system, but which can give attackers a picture of what's happening in a computer's memory.

The SMM rootkit comes with keylogging and communications software and could be used to steal sensitive information from a victim's computer. It was built by Shawn Embleton and Sherri Sparks, who run an Oviedo, Florida, security company called Clear Hat Consulting.

The proof-of-concept software will be demonstrated publicly for the first time at the Black Hat security conference in Las Vegas this August.

The rootkits used by cyber crooks today are sneaky programs designed to cover up their tracks while they run in order to avoid detection. Rootkits hit the mainstream in late 2005 when Sony BMG Music used rootkit techniques to hide its copy protection software. The music company was ultimately forced to recall millions of CDs amid the ensuing scandal.

In recent years, however, researchers have been looking at ways to run rootkits outside of the operating system, where they are much harder to detect. For example, two years ago researcher Joanna Rutkowska introduced a rootkit called Blue Pill, which used AMD's chip-level virtualization technology to hide itself. She said the technology could eventually be used to create "100 percent undetectable malware."

"Rootkits are going more and more toward the hardware," said Sparks, who wrote another rootkit three years ago called Shadow Walker. "The deeper into the system you go, the more power you have and the harder it is to detect you."

Blue Pill took advantage of new virtualization technologies that are now being added to microprocessors, but the SMM rootkit uses a feature that has been around for much longer and can be found in many more machines. SMM dates back to Intel's 386 processors, where it was added as a way to help hardware vendors fix bugs in their products using software. The technology is also used to help manage the computer's power management, taking it into sleep mode, for example.

In many ways, an SMM rootkit, running in a locked part of memory, would be more difficult to detect than Blue Pill, said John Heasman, director of research with NGS Software, a security consulting firm. "An SMM rootkit has major ramifications for things like [antivirus software products]," he said. "They will be blind to it."