Hacker Defeats Hardware-based Rootkit Detection

Manequintet writes "Joanna Rutkowska's latest bit of rootkit-related research shatters the myth that hardware-based (PCI cards or FireWire bus) RAM acquisition is the most reliable and secure way to do forensics. At this year's Black Hat Federal conference, she demonstrated three different attacks against AMD64 based systems, showing how the image of volatile memory (RAM) can be made different from the real contents of the physical memory as seen by the CPU. The overall problem, Rutkowska explained, is the design of the system that makes it impossible to reliably read memory from computers. "Maybe we should rethink the design of our computer systems so they they are somehow verifiable," she said."

Comments

Re:I thought this was invalid anyway

[JackHoffman]

The rootkits that are written to the disk aren't the biggest problem. Like you said, one can "simply" look at the drive from a clean system. The problem is with rootkits that are only installed in RAM, while the system is running. The attacker exploits some hole in an application or in the OS and then transfers the whole system into a virtual machine that looks exactly like the real thing, so the rootkit can't be detected from inside the OS. Nothing is written to disk, so when the system is powered down, the rootkit vanishes into thin air. Servers are unlikely to be powered down often and even if they are, the cracker can simply attack again. With the rootkit undetected, it is likely that the exploited bug has not been corrected. Common wisdom was that this type of attack can be detected by looking at the contents of the RAM in a way which bypasses the OS. The rootkit has to be somewhere, right? Well, according to this article, there is a way to hide the real RAM contents from hardware assisted forensic methods.