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We introduce the notion of re-establishing trust in compro- mised systems, specically looking at recovering from kernel-level root- kits. An attacker that has compromised a system will often install a set of tools, known as a rootkit, which will break trust in the system as well as serve the attacker with other functionalities. One type of rootkit is a kernel-level rootkit, which will patch running kernel code with untrusted kernel code. Specically , current kernel-level rootkits replace trusted sys- tem calls with trojaned system calls. Our approach to recover from these type of rootkits is to extract the system call table from a known-good kernel image and reinstall the system call table into the running ker- nel. Building on our approach to current generation rootkits, we discuss future generation rootkits and address how to recover from them.

Re-establishing Trust in Compromised Systems: Recovering from Rootkits That Trojan the System Call Table