Researchers at Matasano earlier in the day delivered presentations on ways to detect the virtualized rootkit in a session titled “Dont Tell Joanna, The Virtualized Rootkit Is Dead.” Rutkowska ended the day with her own session, “IsGameOver(), anyone?” in which she answered her own question: No, the game wasnt over, given that Matasanos rootkit detection techniques didnt quite work.
Along with colleague Alexander Tereshkin at her newly launched Invisible Things Lab, Rutkowska has rebuilt Blue Pill from scratch. As described on the BluePill.org site where shes posted the rootkit for download, the new rootkit has been completely rearchitected with a common hypervisor virtual machine layer architecture.
Its new features include on-the-fly loading and unloading—presumably a crucial component of the rootkits new ability to play chicken as it runs and hides from timing determination detection attacks, aka Blue Chicken Technology.
The new Blue Pill also includes support for nested hypervisors—a capability that will allow the rootkit to survive when a target system simulates an environment and thus forces its simulation to simulate.
Rutkowska has also listed Blue Pills current limitations. They include what she calls an overly simple cycle emulation in the rootkits RDTSC (read time stamp counter).
Also, Blue Chicken has a TimeBomb setting algorithm that “seems to contain a mysterious race condition that causes a BSoD [Blue Screen of Death, aka stop error] from time to time after the [timebomb] is set,” she says on her site.
Also, Virtual PC 2007 with enabled hardware virtualization currently crashes when run inside a Blue-Pilled machine. The nesting feature also has a feature that Rutkowska said might cause a crash due to CPU identification interception.
Also, among other things, the new Blue Pill lacks support for intercepting “exotic” high-precision local timers, she said.
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