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Welcome to the Breaking Protections MCQs Page

Dive deep into the fascinating world of Breaking Protections with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Breaking Protections, a crucial aspect of Reverse Engineering. In this section, you will encounter a diverse range of MCQs that cover various aspects of Breaking Protections, 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.

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Check out the MCQs below to embark on an enriching journey through Breaking Protections. 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 Breaking Protections. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Breaking Protections MCQs | Page 4 of 7

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Q31.
Why does reencrypting each function create an inconvenience for crackers?

a.

It makes it difficult to identify calls from the program into the operating system

b.

It makes it almost impossible to set breakpoints on operating system APIs

c.

It prevents crackers from dumping the entire decrypted program to a file

d.

It increases the memory consumption impact on the program

Discuss
Answer: (c).It prevents crackers from dumping the entire decrypted program to a file Explanation:Reencrypting each function creates an inconvenience for crackers because they never get to the point where they have the entire program decrypted in memory (which is a perfect time to dump the entire decrypted program to a file and then conveniently reverse it from there).
Q32.
What is the obfuscated interface in Defender?

a.

The encryption algorithm used to protect the program

b.

The method by which the program accesses the operating system

c.

The way the program interacts with users

d.

The way the program handles errors

Discuss
Answer: (b).The method by which the program accesses the operating system Explanation:The obfuscated interface in Defender is its interface with the operating system.
Q33.
Why does the obfuscated interface make it difficult for crackers to find important code areas in the target program?

a.

It prevents the program from calling operating system APIs directly

b.

It encrypts all code in the program

c.

It hides the user interface from view

d.

It obfuscates all error messages

Discuss
Answer: (a).It prevents the program from calling operating system APIs directly Explanation:The obfuscated interface in Defender makes it difficult for crackers to find important code areas in the target program because it makes it very difficult to identify calls from the program into the operating system, and almost impossible to set breakpoints on operating system APIs. Most crackers rely on operating system calls for finding important code areas in the target program.
Q34.
How does the interface attempt to attach to the operating system?

a.

By making a single direct API call

b.

By manually finding the first system component using the TEB

c.

By copying the operating system code to a random memory address

d.

By using a special hardware device to access the operating system

Discuss
Answer: (b).By manually finding the first system component using the TEB Explanation:The interface attempts to attach to the operating system without making a single direct API call. This is done by manually finding the first system component (NTDLL.DLL) using the TEB, and then manually searching through its export table for APIs.
Q35.
How does Defender access the operating system after the user-mode components are copied to a random memory address?

a.

By calling APIs through the user-mode component

b.

By using the original module of the operating system

c.

By copying the user-mode components to a new memory address every time the program starts

d.

By accessing the operating system through the copied code instead of using the original module

Discuss
Answer: (d).By accessing the operating system through the copied code instead of using the original module Explanation:After the user-mode components are copied to a random memory address, Defender accesses the operating system through this copied code instead of using the original module. Any breakpoints placed on any user-mode API would never be hit.
Q36.
What impact does the obfuscated interface have on the program's memory consumption and performance?

a.

It has no impact

b.

It has a minor impact on memory consumption and no impact on performance

c.

It has a significant impact on memory consumption and no impact on performance

d.

It has a significant impact on both memory consumption and performance

Discuss
Answer: (d).It has a significant impact on both memory consumption and performance Explanation:Obfuscated interface has a significant memory consumption impact on the program and a certain performance impact.
Q37.
How does Defender obfuscate the calls to operating system APIs?

a.

By searching APIs using a checksum value computed from their names

b.

By storing the actual names of APIs

c.

By randomly reorganizing the table during initialization

d.

By directly stepping into the kernel in a kernel debugger

Discuss
Answer: (a).By searching APIs using a checksum value computed from their names Explanation:The program searches APIs using a checksum value computed from their names to make it difficult to determine which API the program is trying to call.
Q38.
What is the weakness in Defender's technique of obfuscating API calls?

a.

The implementation maintains the APIs order from the export table

b.

It is not possible to retrieve the API name from its checksum

c.

It is possible to directly step into the kernel in a kernel debugger to find out which API is being called

d.

Randomly reorganizing the table during initialization

Discuss
Answer: (c).It is possible to directly step into the kernel in a kernel debugger to find out which API is being called Explanation:For some APIs, it is possible to just directly step into the kernel in a kernel debugger and find out which API is being called.
Q39.
What was the purpose of adding the call to IsDebuggerPresent API in Defender?

a.

To make it irrelevant

b.

To make it difficult to identify calls from the program into the operating system

c.

To load Defender on older versions of Windows

d.

To simplify the process of determining which API was being called

Discuss
Answer: (c).To load Defender on older versions of Windows Explanation:The call to IsDebuggerPresent API was added to load Defender on older versions of Windows as these versions expected all programs to make at least one system call.
Q40.
What is the impact of obfuscating the interface with the operating system?

a.

It has no impact

b.

It has a minor impact on memory consumption and no impact on performance

c.

It has a significant impact on memory consumption and no impact on performance

d.

It has a significant impact on both memory consumption and performance

Discuss
Answer: (d).It has a significant impact on both memory consumption and performance Explanation:Obfuscating the interface with the operating system has a significant impact on both memory consumption and performance.
Page 4 of 7

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