SIDT, Red Pill
Created the Monday 11 March 2019. Updated 1 year ago.
Red Pill is a technique used by malware to determine whether it is running on a physical machine or a virtual machine. The Red Pill technique involves executing the SIDT instruction, which retrieves the value of the Interrupt Descriptor Table Register (IDTR) and stores it in a memory location.
On a physical machine, the IDTR will contain the address of the Interrupt Descriptor Table (IDT), which is a data structure used by the operating system to manage interrupts. However, on a virtual machine, the IDTR will contain the address of the IDT for the virtual machine, which is different from the IDT for the host machine.
By comparing the IDTR on a physical and a virtual machine, malware can determine whether it is running on a physical or a virtual machine. This information can be used by the malware to adjust its behavior accordingly.
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