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A kernel mode rootkit can also hook the System Service Descriptor Table (SSDT), or modify the gates between user mode and kernel mode, in order to cloak itself. [4] Similarly for the Linux operating system, a rootkit can modify the system call table to subvert kernel functionality.
Detecting rootkits is separated into many complex layers that include integrity checking and behavioral detection. By checking the CPU usage, ongoing and outgoing network traffic, or the signatures of drivers, simple anti-virus tools can detect common rootkits. However, this is not the case with a kernel type rootkit.
The SSDT maps syscalls to kernel function addresses. When a syscall is issued by a user space application, it contains the service index as parameter to indicate which syscall is called. The SSDT is then used to resolve the address of the corresponding function within ntoskrnl.exe. In modern Windows kernels, two SSDTs are used: One for generic ...
The malware has both user mode and kernel mode rootkit ability under Windows, [67] and its device drivers have been digitally signed with the private keys of two public key certificates that were stolen from separate well-known companies, JMicron and Realtek, both located at Hsinchu Science Park in Taiwan.
t. e. System Management Mode (SMM, sometimes called ring −2 in reference to protection rings) [1][2] is an operating mode of x86 central processor units (CPUs) in which all normal execution, including the operating system, is suspended. An alternate software system which usually resides in the computer's firmware, or a hardware-assisted ...
The arrow represents a rootkit gaining access to the kernel, and the little gate represents normal privilege elevation, where the user has to enter an Administrator username and password. Privilege escalation is the act of exploiting a bug , a design flaw , or a configuration oversight in an operating system or software application to gain ...
The Rootkit Arsenal: Escape and Evasion in the Dark Corners of the System is a book written by Bill Blunden, published by Jones & Bartlett Publishers in May 2009. The book takes the reader in depth about rootkit technology and uses. It covers topics such as IA-32 assembly, the Windows system architecture, kernel debugging, advanced rootkit ...
CPU modes. CPU modes (also called processor modes, CPU states, CPU privilege levels and other names) are operating modes for the central processing unit of most computer architectures that place restrictions on the type and scope of operations that can be performed by instructions being executed by the CPU. For example, this design allows an ...