The answer is the UserAssist registry artifact, which records program execution history with counts and timestamps. This is correct because the UserAssist keys under NTUSER.DAT track every program launched via Windows Explorer, storing the executable path, a hexadecimal-encoded run count, and the last execution timestamp in a Rot13-obfuscated format. On the Computer Hacking Forensic Investigator CHFI exam, this artifact tests your ability to reconstruct user activity and identify executed applications, often appearing in scenario-based questions where you must correlate run counts with suspicious binaries. A common trap is overlooking the Rot13 encoding of the GUID’s count value, which can hide the actual run number; always decode it using a simple Caesar cipher shift of 13. Memory tip: think of UserAssist as “User’s Launch Log”—it’s the forensic fingerprint of every double-click.
CHFI OS and Network Forensics Practice Question
This CHFI practice question tests your understanding of os and network forensics. 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.
During a Windows forensic investigation, an analyst finds a registry key under NTUSER.DAT\Software\Microsoft\Windows\CurrentVersion\Explorer\UserAssist\{GUID}\Count. What type of artifact is this, and what information does it typically contain?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
UserAssist entries that record program execution history with counts and timestamps
UserAssist keys track programs launched via Windows Explorer, recording the executable path, last execution time, and run count. This is a common artifact for determining application usage.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
UserAssist entries that record program execution history with counts and timestamps
Why this is correct
UserAssist is designed to log program launches by the user, including the number of times run and last execution.
Related concept
Static NAT maps one inside address to one outside address.
✗
Jump list data from the taskbar showing recently opened files
Why it's wrong here
Jump lists are stored in %APPDATA%\Microsoft\Windows\Recent\AutomaticDestinations.
✗
Prefetch file metadata indicating application launch times
Why it's wrong here
Prefetch files are stored in C:\Windows\Prefetch, not in the registry.
✗
ShellBags data displaying folder view settings and sizes
Why it's wrong here
ShellBags are stored under HKCU\Software\Classes\Local Settings\Software\Microsoft\Windows\Shell\Bags.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CHFI question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CHFI NAT questions on configuration and troubleshooting.
OS and Network Forensics — This question tests OS and Network Forensics — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: UserAssist entries that record program execution history with counts and timestamps — UserAssist keys track programs launched via Windows Explorer, recording the executable path, last execution time, and run count. This is a common artifact for determining application usage.
What should I do if I get this CHFI question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CHFI NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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