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INT 0x2D Anti-Debugging

When the instruction INT2D is executed, the exception EXCEPTION_BREAKPOINT is raised. Windows uses the EIP register as an exception address and then increments the EIP register value. Windows also examines the value of the EAX register while INT2D is executed.

IN Sandbox Evasion

The IN instruction is a type of machine code instruction that is used to read data from an input port. This instruction can only be executed in privileged mode, such as in kernel mode, and an attempt to execute it in user mode will generate an exception.

However, some virtual machine monitors, such as VMWare, use a special port called …

INT3 Instruction Scanning Anti-Debugging

Instruction INT3 is an interruption which is used as Software breakpoints. These breakpoints are set by modifying the code at the target address, replacing it with a byte value 0xCC (INT3 / Breakpoint Interrupt).

The exception EXCEPTION_BREAKPOINT (0x80000003) is generated, and an exception handler will be raised. Malware identify software breakpoints by scanning for the byte 0xCC in the protector …

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