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Register Reassignment
Register reassignment is a technique used in code obfuscation and anti-disassembling to make reverse engineering and analysis more difficult. It involves modifying the instructions in a program to use different registers in different versions or instances of the program. This can make it more difficult for a reverse engineer or disassembler to understand the program's behavior, as the register assignments …
Read moreDebug Registers, Hardware Breakpoints
Hardware breakpoints allow a debugger to pause execution at specific memory addresses without modifying the program code. They are stored in special CPU registers (DR0 through DR3 on Intel CPUs).
For anti-debugging, malware can inspect the values of these debug registers. If any of the registers contain a non-empty value, it indicates that a hardware breakpoint has been set …
Read moreSIDT, Red Pill
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 …
Read moreCPUID
The CPUID instruction is a low-level command that allows you to retrieve information about the CPU that is currently running. This instruction, which is executed at the CPU level (using the bytecode 0FA2), is available on all processors that are based on the Pentium architecture or newer.
You can use the CPUID instruction to retrieve various pieces of information …
Read moreAbusing the Return Pointer
Abusing the return pointer is an anti-disassembling technique that involves using the return instruction (RETN) in a way that is not expected by the disassembler. This can make it more difficult for the disassembler to accurately reconstruct the program's original instructions and can also make it more difficult for analysts to understand the program's behavior.
The RETN instruction is …
Read moreInserting Garbage Bytes
Garbage bytes are random or meaningless data that is inserted into a program's code in order to make reverse engineering and analysis more difficult. This is an anti-disassembling technique, as the insertion of these random bytes can cause disassemblers to misinterpret the code and produce incorrect disassembly results.
The insertion of garbage bytes is usually used in conjunction with …
Read moreMisusing Structured Exception Handlers
Misusing Structured Exception Handlers is a technique used by malware to make it more difficult for security analysts to reverse engineer the code. Structured Exception Handlers (SEH) are functions that are used to handle exceptions in a program. These can be misused by malware to fool disassemblers and make it harder to analyze the code. One way this is done …
Read moreSystem Binary Proxy Execution: Regsvcs/Regasm
![Defense Evasion [Mitre] icon](/media/2024/04/08/icons8-burglar.svg){kind=small}
Adversaries may abuse Regsvcs and Regasm to proxy execution of code through a trusted Windows utility. Regsvcs and Regasm are Windows command-line utilities that are used to register .NET Component Object Model (COM) assemblies. Both are binaries that may be digitally signed by Microsoft.
Both utilities may be used to bypass application control through use of attributes within the …
Read moreDetecting Virtual Environment Artefacts
Malware often checks for artifacts left by virtualization platforms to determine if it is running inside a virtual environment. Detecting such artifacts allows the malware to adapt its behavior, delay execution, or avoid exposing malicious functionality during analysis.
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QEMU: QEMU registers artifacts in the Windows registry. For example, the key
HARDWARE\DEVICEMAP\Scsi\Scsi Port 0\Scsi Bus 0\Target Id 0\Logical …