- A
Windows executable files
'MZ' identifies PE executables.
- B
PDF files with embedded JavaScript
Why wrong: PDF files start with '%PDF'.
- C
Linux ELF binaries
Why wrong: ELF binaries start with '\x7fELF'.
- D
Malicious documents containing macros
Why wrong: Documents like .docx do not start with 'MZ'.
Question 697 of 1,000
200-201 Security Monitoring Practice Question
This 200-201 practice question tests your understanding of security monitoring. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An analyst receives a YARA rule that includes the string 'MZ' at the beginning of a file. What does this indicator typically help identify?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Windows executable files
The string 'MZ' (0x4D 0x5A) is the magic number for the MS-DOS header, which is present at the very beginning of all Windows Portable Executable (PE) files, including .exe, .dll, and .sys files. A YARA rule that checks for 'MZ' at offset 0 is specifically targeting the PE file format, which is the standard executable format for Windows. This indicator helps an analyst quickly identify that a file is likely a Windows executable, regardless of its extension.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Windows executable files
Why this is correct
'MZ' identifies PE executables.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
PDF files with embedded JavaScript
Why it's wrong here
PDF files start with '%PDF'.
- ✗
Linux ELF binaries
Why it's wrong here
ELF binaries start with '\x7fELF'.
- ✗
Malicious documents containing macros
Why it's wrong here
Documents like .docx do not start with 'MZ'.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the concept of file magic numbers to see if candidates confuse the 'MZ' signature of Windows executables with other common file headers, such as '%PDF' for PDFs or 'PK' for ZIP archives, leading them to select a plausible but incorrect option like malicious documents or PDFs.
Detailed technical explanation
How to think about this question
The 'MZ' string is the signature of the MS-DOS stub, which is a legacy compatibility layer that prints 'This program cannot be run in DOS mode' when executed in a pure DOS environment. In modern PE files, the actual PE header (starting with 'PE\0\0') is located at the offset specified by the e_lfanew field in the IMAGE_DOS_HEADER structure, which is typically at offset 0x3C. YARA rules that only check for 'MZ' at offset 0 can be evaded by prepending data to the file, so advanced rules often verify the PE signature at the correct offset.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 200-201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 200-201 question test?
Security Monitoring — This question tests Security Monitoring — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Windows executable files — The string 'MZ' (0x4D 0x5A) is the magic number for the MS-DOS header, which is present at the very beginning of all Windows Portable Executable (PE) files, including .exe, .dll, and .sys files. A YARA rule that checks for 'MZ' at offset 0 is specifically targeting the PE file format, which is the standard executable format for Windows. This indicator helps an analyst quickly identify that a file is likely a Windows executable, regardless of its extension.
What should I do if I get this 200-201 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This 200-201 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-201 exam.
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