Quick Answer
The answer is process injection, as the presence of CreateRemoteThread and WriteProcessMemory in a suspicious file’s strings output directly points to this technique. These Windows API functions are the core building blocks of process injection: WriteProcessMemory writes malicious code into the address space of a legitimate target process, and CreateRemoteThread then executes that code within the remote process, allowing the malware to run under the guise of a trusted application. On the Certified Ethical Hacker CEH exam, this question tests your ability to recognize common API-level indicators of malware behavior, often appearing in scenario-based questions about forensic analysis or evasion tactics. A common trap is confusing process injection with DLL injection—remember that DLL injection is a specific subtype of process injection, but the combination of these two APIs is the hallmark of the broader technique. Memory tip: think “Write then Run” — WriteProcessMemory writes the payload, CreateRemoteThread runs it.
This CEH practice question tests your understanding of malware, social engineering and network attacks. 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.
After a security incident, an analyst retrieves a suspicious file. The analyst runs the 'strings' command on it and sees references to 'CreateRemoteThread' and 'WriteProcessMemory'. Which technique does this indicate?
DLL hijacking
Why wrong: DLL hijacking involves loading a malicious DLL, not injecting code.
Privilege escalation
Why wrong: Privilege escalation exploits vulnerabilities, not direct API calls for injection.
Process injection
CreateRemoteThread and WriteProcessMemory are used to inject code into a remote process.
Buffer overflow
Why wrong: Buffer overflow exploits vulnerability, not API calls for injection.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Process injection
These Windows API functions are commonly used for process injection, where code is written into another process's memory and executed. This is a common malware technique to evade detection.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
DLL hijacking
Why it's wrong here
DLL hijacking involves loading a malicious DLL, not injecting code.
Privilege escalation
Why it's wrong here
Privilege escalation exploits vulnerabilities, not direct API calls for injection.
Process injection
Why this is correct
CreateRemoteThread and WriteProcessMemory are used to inject code into a remote process.
Related concept
Authentication checks who the user is.
Buffer overflow
Why it's wrong here
Buffer overflow exploits vulnerability, not API calls for injection.
Common exam traps
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
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.
What to study next
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CEH questions on access control and AAA configuration.
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FAQ
Malware, Social Engineering and Network Attacks — This question tests Malware, Social Engineering and Network Attacks — Authentication checks who the user is..
The correct answer is: Process injection — These Windows API functions are commonly used for process injection, where code is written into another process's memory and executed. This is a common malware technique to evade detection.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related CEH questions on access control and AAA configuration.
Authentication checks who the user is.
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Last reviewed: Jun 21, 2026
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