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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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Antireversing Techniques MCQs | Page 6 of 15

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Q51.
How does IsDebuggerPresent work?

a.

It accesses the current process’s PEB to determine whether a user-mode debugger is attached

b.

It terminates the program if a user-mode debugger is attached

c.

It bypasses user-mode debuggers

d.

It stands out as being a part of antidebugger logic

Discuss
Answer: (a).It accesses the current process’s PEB to determine whether a user-mode debugger is attached Explanation:IsDebuggerPresent accesses the current process’s PEB to determine whether a user-mode debugger is attached.
Q52.
Why is calling IsDebuggerPresent not very effective against reversers?

a.

It is difficult to detect and bypass

b.

It is easy to detect and bypass

c.

It is very effective

d.

It does not work on user-mode debuggers

Discuss
Answer: (b).It is easy to detect and bypass Explanation:Calling IsDebuggerPresent and terminating the program if it returns TRUE is not very effective against reversers because it is very easy to detect and bypass.
Q53.
How can IsDebuggerPresent be implemented intrinsically?

a.

By copying its code into the program

b.

By changing the offsets in the NT data structure

c.

By using inline assembly language code

d.

By using a specific implementation of the API

Discuss
Answer: (a).By copying its code into the program Explanation:IsDebuggerPresent can be implemented intrinsically by copying its code into the program.
Q54.
What is the disadvantage of implementing IsDebuggerPresent intrinsically?

a.

It is easy to detect and bypass

b.

It is difficult to predict what would happen if Microsoft changes one of these data structures in a future release of the operating system

c.

It is not possible in every programming language or development platform

d.

It does not work on user-mode debuggers

Discuss
Answer: (b).It is difficult to predict what would happen if Microsoft changes one of these data structures in a future release of the operating system Explanation:The disadvantage of implementing IsDebuggerPresent intrinsically is that it takes a specific implementation of the IsDebuggerPresent API and assumes that two internal offsets in NT data structure will not change in future releases of the operating system.
Q55.
How likely are the internal offsets in the NT data structure to change?

a.

Unlikely, as IsDebuggerPresent has not changed between Windows NT 4.0 and Windows Server 2003

b.

Likely, as IsDebuggerPresent has not changed between Windows NT 4.0 and Windows Server 2003

c.

Unlikely, as Microsoft has not changed these data structures in the past 7 years

d.

Likely, as past performance is not indicative of future results

Discuss
Answer: (a).Unlikely, as IsDebuggerPresent has not changed between Windows NT 4.0 and Windows Server 2003 Explanation:IsDebuggerPresent has not changed between Windows NT 4.0 and Windows Server 2003, which is a solid indicator that these are static data structures that are not likely to change.
Q56.
What is required to incorporate assembly language code into a program?

a.

A C/C++ compiler that supports the _asm keyword

b.

A programming language or development platform that supports assembly language code

c.

The ability to change the offsets in the NT data structure

d.

The ability to bypass user-mode debuggers

Discuss
Answer: (b).A programming language or development platform that supports assembly language code Explanation:Incorporating assembly language code into a program is not a problem with most C/C++ compilers, but it might not be possible in every programming language or development platform.
Q57.
What is the SystemKernelDebuggerInformation request code used for?

a.

Obtaining information on whether a kernel debugger is attached to the system

b.

Checking if SoftICE kernel device is present

c.

Opening a file called “\.SIWVID”

d.

All of the above

Discuss
Answer: (a).Obtaining information on whether a kernel debugger is attached to the system Explanation:The SystemKernelDebuggerInformation request code is used to obtain information from the kernel on whether a kernel debugger is currently attached to the system.
Q58.
What is the data structure returned by the SystemKernelDebuggerInformation request?

a.

SYSTEM_PROCESS_INFORMATION

b.

SYSTEM_THREAD_INFORMATION

c.

SYSTEM_KERNEL_DEBUGGER_INFORMATION

d.

SYSTEM_HANDLE_INFORMATION

Discuss
Answer: (c).SYSTEM_KERNEL_DEBUGGER_INFORMATION Explanation:The data structure returned by the SystemKernelDebuggerInformation request is SYSTEM_KERNEL_DEBUGGER_INFORMATION.
Q59.
What should be checked to determine whether a kernel debugger is attached to the system using SystemKernelDebuggerInformation?

a.

DebuggerEnabled

b.

DebuggerNotPresent

c.

SoftICE kernel device

d.

Both a and b

Discuss
Answer: (a).DebuggerEnabled Explanation:To determine whether a kernel debugger is attached to the system using SystemKernelDebuggerInformation, the DebuggerEnabled field of the SYSTEM_KERNEL_DEBUGGER_INFORMATION structure should be checked.
Q60.
What is the potential risk of detecting the presence of a kernel debugger?

a.

It could cause legitimate users to be unable to use the program

b.

It could damage the system

c.

It could cause the program to malfunction

d.

None of the above

Discuss
Answer: (a).It could cause legitimate users to be unable to use the program Explanation:The potential risk of detecting the presence of a kernel debugger is that legitimate users who have a kernel debugger installed would be unable to use the program.
Page 6 of 15

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