Welcome to the Antireversing Techniques MCQs Page

Dive deep into the fascinating world of Antireversing Techniques with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Antireversing Techniques, a crucial aspect of Reverse Engineering. In this section, you will encounter a diverse range of MCQs that cover various aspects of Antireversing Techniques, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Reverse Engineering.

Check out the MCQs below to embark on an enriching journey through Antireversing Techniques. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Reverse Engineering.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Antireversing Techniques. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Antireversing Techniques MCQs | Page 7 of 15

Explore more Topics under Reverse Engineering

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03

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04

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05

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06

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07

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08

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11

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Decompilation

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14

Understanding Compiled Arithmetic

15

Deciphering Program Data 🔒

Q61.

What is the Single-Step Interrupt used for in NuMega SoftICE?

It sets its own handler for int 1 in the IDT.

It is used to detect whether a debugger is attached to the system.

It is used to single-step through a program.

It is used to invoke an exception handler.

Discuss

Answer: (c).It is used to single-step through a program. Explanation:The Single-Step Interrupt is used to single-step through a program in NuMega SoftICE.

Q62.

How does the program use the exception handler to detect whether SoftICE is running?

The program installs an exception handler and invokes int 1.

The program checks the interrupt descriptor table for SoftICE's handler for int 1.

The program opens the SoftICE kernel device and checks whether it is present.

The program checks whether the file "\.SIWVID" can be opened successfully.

Discuss

Answer: (a).The program installs an exception handler and invokes int 1. Explanation:The program installs an exception handler and invokes int 1. If the exception code is anything but the conventional access violation exception, you can assume that SoftICE is running.

Q63.

What is the advantage of using the Single-Step Interrupt trick to detect SoftICE?

It is an effective way to detect SoftICE even for experienced reversers.

It is a reliable way to detect SoftICE with very few false positives.

It might baffle reversers who have never run into this trick before.

It is a straightforward way to detect SoftICE without using debugger-specific approaches.

Discuss

Answer: (c).It might baffle reversers who have never run into this trick before. Explanation:The advantage of using the Single-Step Interrupt trick is that it might baffle reversers who have never run into this trick before and it might take them several hours to figure out what's going on.

Q64.

What is the trap flag approach for detecting debuggers?

It enables the trap flag in the current process and checks for raised exceptions

It sets its own handler for int 1 in the interrupt descriptor table (IDT)

It checks for the presence of the SoftICE kernel device

It uses the NtQuerySystemInformation native API to check for kernel debuggers

Discuss

Answer: (a).It enables the trap flag in the current process and checks for raised exceptions Explanation:The trap flag approach for detecting debuggers enables the trap flag in the current process and checks for raised exceptions.

Q65.

What is the advantage of the trap flag approach?

It detects every debugger, user mode or kernel mode

It detects only NuMega SoftICE

It is difficult for reversers to detect and work around this scheme

It boggles reversers who have never encountered it before

Discuss

Answer: (a).It detects every debugger, user mode or kernel mode Explanation:The advantage of the trap flag approach is that it can detect every debugger, whether in user mode or kernel mode, because all debuggers use the trap flag for tracing a program.

Q66.

What is a limitation of the trap flag approach?

It only detects NuMega SoftICE

It can be detected by some debuggers if the detection code is being stepped through

It is not possible to incorporate assembly language code into the program

It increases the risk of false positives

Discuss

Answer: (b).It can be detected by some debuggers if the detection code is being stepped through Explanation:Some debuggers will only be detected if the detection code is being stepped through, in such cases the mere presence of the debugger won’t be detected as long the code is not being traced. This means that the trap flag approach can be detected by some debuggers if the detection code is being stepped through, which is a limitation of this technique.

Q67.

What is the advantage of using code checksums as an antidebugging technique?

It is effective against code patching

It is effective against hardware breakpoints

It doesn't add much execution time to the program

Both a and c

Discuss

Answer: (d).Both a and c Explanation:Code checksums can detect modifications made to the program code by debuggers or code patching, and verifying checksums only for sensitive functions does not significantly impact program execution time.

Q68.

How does the code checksum technique work as an antidebugging measure?

Checksums are precalculated for functions and checked randomly at runtime

Hardware breakpoints are prevented from being set

Code is modified to make it more difficult for reversers to understand the program flow

The program is terminated if a debugger is detected

Discuss

Answer: (a).Checksums are precalculated for functions and checked randomly at runtime Explanation:Checksums are precalculated for functions within the program, and checked randomly during runtime to detect modifications made by debuggers or code patching.

Q69.

What is the downside of using code checksums as an antidebugging technique?

It is not effective against code patching

It adds significant execution time to the program

It cannot detect hardware breakpoints

It cannot detect all types of debuggers

Discuss

Answer: (b).It adds significant execution time to the program Explanation:Constantly recalculating checksums is a relatively expensive operation, which can significantly impact program execution time.

Q70.

How can the use of code checksums be optimized to minimize the impact on program execution time?

Calculate checksums for all functions in the program

Verify checksums for all functions during runtime

Verify checksums only for sensitive functions during runtime

Use hardware breakpoints to detect modifications to the code

Discuss

Answer: (c).Verify checksums only for sensitive functions during runtime Explanation:Verifying checksums only for sensitive functions during runtime can minimize the impact on program execution time.

Page 7 of 15

Low Level Software 🔒

Windows Fundamentals 🔒

Reversing Tools 🔒

Auditing Program Binaries 🔒

Reversing Malware 🔒

Breaking Protections 🔒

Reversing .NET 🔒

Deciphering Code Structures 🔒

Deciphering Program Data 🔒

Welcome to the Antireversing Techniques MCQs Page

Antireversing Techniques MCQs | Page 7 of 15

Explore more Topics under Reverse Engineering

Introduction to Reverse Engineering

Beyond the Documentation

Deciphering File Formats

Piracy and Copy Protection

Decompilation

Understanding Compiled Arithmetic

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