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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.

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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.

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Antireversing Techniques MCQs | Page 5 of 15

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Q41.
How are breakpoints usually set in a program by a debugger?

a.

By replacing the instruction at the breakpoint with an int 3 instruction

b.

By setting a hardware breakpoint in the processor

c.

Both a and b

d.

None of the above

Discuss
Answer: (a).By replacing the instruction at the breakpoint with an int 3 instruction Explanation:Debuggers usually set breakpoints in a program by replacing the instruction at the breakpoint with an int 3 instruction.
Q42.
How do hardware breakpoints differ from software breakpoints?

a.

Hardware breakpoints modify the target program, while software breakpoints don't.

b.

Software breakpoints are managed by the processor, while hardware breakpoints aren't.

c.

Hardware breakpoints don't modify the target program, while software breakpoints do.

d.

None of the above

Discuss
Answer: (c).Hardware breakpoints don't modify the target program, while software breakpoints do. Explanation:Hardware breakpoints don't modify anything in the target program—the processor simply knows to break when a specific memory address is accessed. Software breakpoints, on the other hand, usually replace an instruction in the target program with an int 3 instruction.
Q43.
What is the single-step interrupt?

a.

An interrupt generated by the processor after every instruction that is executed

b.

An interrupt generated by the processor when a hardware breakpoint is hit

c.

An interrupt generated by the processor when a software breakpoint is hit

d.

None of the above

Discuss
Answer: (a).An interrupt generated by the processor after every instruction that is executed Explanation:The single-step interrupt is generated by the processor after every instruction that is executed, and is used by debuggers to implement single-stepping through code.
Q44.
What is IsDebuggerPresent API?

a.

An antidebugging measure

b.

A Windows API that can detect user-mode debuggers

c.

An assembly code that terminates a program

d.

A tool for detecting viruses

Discuss
Answer: (b).A Windows API that can detect user-mode debuggers Explanation:IsDebuggerPresent API is a Windows API that can be used as a trivial tool for detecting user-mode debuggers.
Q45.
What does IsDebuggerPresent API access to determine whether a user-mode debugger is attached?

a.

Current process’s Process Environment Block ( PEB )

b.

Current process’s Thread Environment Block ( TEB )

c.

Current process’s Virtual Memory Block ( VMB )

d.

Current process’s System Environment Block ( SEB )

Discuss
Answer: (a).Current process’s Process Environment Block ( PEB ) Explanation:IsDebuggerPresent API accesses the current process’s Process Environment Block (PEB) to determine whether a user-mode debugger is attached.
Q46.
Why is directly calling IsDebuggerPresent not effective against reversers?

a.

Because it is too difficult to use

b.

Because it is too easy to detect and bypass

c.

Because it requires a lot of coding

d.

Because it is too time-consuming

Discuss
Answer: (b).Because it is too easy to detect and bypass Explanation:Directly calling IsDebuggerPresent is not very effective against reversers because it is very easy to detect and bypass.
Q47.
How can the effectiveness of IsDebuggerPresent API be improved as an antidebugging measure?

a.

By implementing it intrinsically within the program code

b.

By calling it multiple times

c.

By using it with another API

d.

By increasing the size of the program

Discuss
Answer: (a).By implementing it intrinsically within the program code Explanation:The effectiveness of IsDebuggerPresent API can be improved as an antidebugging measure by implementing it intrinsically within the program code.
Q48.
How many lines of assembly code does the implementation of IsDebuggerPresent API consist of?

a.

One

b.

Two

c.

Three

d.

Four

Discuss
Answer: (d).Four Explanation:The implementation of IsDebuggerPresent API consists of four lines of assembly code.
Q49.
What is the disadvantage of embedding this code sequence within a program?

a.

It takes a specific implementation of IsDebuggerPresent API

b.

It requires too much memory

c.

It is too difficult to implement

d.

It causes the program to run slower

Discuss
Answer: (a).It takes a specific implementation of IsDebuggerPresent API Explanation:One significant disadvantage of embedding this code sequence within a program is that it takes a specific implementation of IsDebuggerPresent API and assumes that two internal offsets in NT data structure will not change in future releases of the operating system.
Q50.
What is IsDebuggerPresent?

a.

A Windows API

b.

A debugging tool for OllyDbg

c.

A debugging tool for WinDbg

d.

An antidebugging measure

Discuss
Answer: (a).A Windows API Explanation:IsDebuggerPresent is a Windows API that can be used to detect user-mode debuggers such as OllyDbg or WinDbg.
Page 5 of 15

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