You’re analyzing a system suspected of being compromised. You found a file named log.txt that is unusually large. This could be an example of:

Question

BlackTom AI · Accepted Answer

When evaluating what an unusually large log.txt file could indicate, we should consider what each option implies about system activity.
Option a: Steganography. This technique hides secret information within other non-secret data (like images or audio). A large log file does not inherently indicate hidden data within media; steganography is more about covert data embedding than generating voluminous log files. This makes this choice unlikely as an explanation for an oversized log.txt.
Option b: Network Sniffing. Network sniffing involves capturing network traffic for analysis. While it can generate logs, the presence of a single unusually large log.txt does not by itself point to traffic capture; it could be many things, and large logs are commonly produced by verbose event logging or other processes, not exclusively network sniffing. This weakens the case for network sniffing as the best single explanation here.
Option c: Keylogging. A keylogger records keystrokes and often stores them in log files for later retrieval. A notably large log.txt is a classic symptom of keystroke logging activity, since every key press or sequence may be logged over time, leading to substantial file growth. This aligns well with the concept of keylogging being responsible for a big log file.
Option d: Phishing. Phishing is a social engineering tactic aimed at tricking users into revealing sensitive information. It does not inherently produce large log files on the victim’s system; rather, it concerns deception and credential theft. Therefore, phishing is not a direct explanation for a large log.txt.
In summary, the anomaly of an unusually large log.txt most plausibly points to a keystroke capture mechanism like keylogging, since such tools generate continuous textual records of user input that accumulate into big files, whereas the other options describe methods that do not directly explain large local log growth. The reasoning for each alternative highlights how they differ from the observed symptom and why they are less likely explanations for the large log file.

Practical CTF Strategies (112025-MHH) Mini CTF Lab Challenges Series - Computer Forensic

You’re analyzing a system suspected of being compromised. You found a file named log.txt that is unusually large. This could be an example of:

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