The answer is persistence and command and control communication. The malware ensures it survives a reboot by creating a hidden file in %AppData% and adding a startup entry to the Windows registry, which is a classic persistence mechanism under MITRE ATT&CK T1547.003. Its attempt to connect to an external IP on port 443 using HTTPS is a textbook command and control technique, as it uses encrypted traffic to blend in with normal web traffic and maintain covert communication with an attacker. On the Certified Ethical Hacker CEH exam, this scenario tests your ability to distinguish between the two distinct phases of the cyber kill chain: maintaining access (persistence) and establishing a remote channel (C2). A common trap is confusing the registry modification itself as C2, but remember: persistence is about staying on the machine, while C2 is about talking out. Memory tip: “Boot and chat” — persistence boots you back in, C2 chats out.
CEH Cryptography and Malware Analysis Practice Question
This CEH practice question tests your understanding of cryptography and malware analysis. 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.
A malware analyst is investigating a suspicious executable that appears to be a Trojan. The analyst runs the executable in a sandbox and observes the following behavior: it creates a hidden file in the %AppData% directory, modifies the Windows registry to add a startup entry, and attempts to connect to an external IP address on port 443 using HTTPS. Which TWO of the following techniques are likely being used by this malware?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Persistence mechanism
The malware adds a startup entry in the Windows registry (e.g., Run or RunOnce keys), which ensures the executable is automatically launched each time the user logs in. This is a classic persistence mechanism, as defined by MITRE ATT&CK technique T1547.003, because it maintains the malware's presence across system reboots.
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.
✗
Keylogging
Why it's wrong here
No keylogging activity is observed in the description.
✗
Fileless execution
Why it's wrong here
The malware creates a hidden file on disk, indicating it is not fileless.
✓
Persistence mechanism
Why this is correct
Adding a startup registry entry is a common persistence technique.
Related concept
Read the scenario before looking for a memorised answer.
✗
Privilege escalation
Why it's wrong here
No behavior indicates an attempt to escalate privileges.
✓
Command and control communication
Why this is correct
Connecting to an external IP over HTTPS is typical for C2.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
EC-Council often tests the distinction between persistence and privilege escalation, where candidates mistakenly think modifying the registry requires elevated privileges, but HKCU keys are user-writable without admin rights.
Detailed technical explanation
How to think about this question
The registry startup entry (e.g., HKCU\Software\Microsoft\Windows\CurrentVersion\Run) is a common persistence location because it requires no administrator privileges and executes under the user's context. The connection to an external IP on port 443 using HTTPS indicates command and control (C2) communication, often using encrypted channels to evade detection and blend with legitimate web traffic. In real-world scenarios, malware like Emotet uses similar persistence and HTTPS-based C2 to maintain access and exfiltrate data.
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 junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CEH question in full detail.
Cryptography and Malware Analysis — This question tests Cryptography and Malware Analysis — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Persistence mechanism — The malware adds a startup entry in the Windows registry (e.g., Run or RunOnce keys), which ensures the executable is automatically launched each time the user logs in. This is a classic persistence mechanism, as defined by MITRE ATT&CK technique T1547.003, because it maintains the malware's presence across system reboots.
What should I do if I get this CEH 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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Question Discussion
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