Decoding VirusTotal Results: More Than Just False Positives

In the world of cybersecurity, understanding the nuances of tools like VirusTotal can be pivotal in identifying potential threats. I used to view the results with a certain skepticism, often assuming that a few antivirus (AV) detections equated to a likely false positive. However, I’ve come to realize that this isn’t always the case, and I hope to share some insights that might help others refine their approach.

A Deeper Dive into VirusTotal

For a comprehensive overview of VirusTotal functionalities, I recommend checking out this informative video by MalwareAnalysisForHedgehogs: Understanding VirusTotal Results. It offers valuable context to better interpret the results you encounter.

Key Aspects to Consider

1. Detection Accuracy

• Reanalysis: It’s crucial to reassess files if they haven’t been scanned recently. Malware signatures often evolve, and VirusTotal displays historical scans to help you gauge the current security landscape.
• Malware Identification: Pay attention to the names associated with the detected threats. For instance, entries labeled as “not-a-virus” indicate that while the file can potentially be harmful, it is not inherently malicious.

2. File Details

• Verify File Types: Ensure that the file is what it claims to be. A mismatch here can raise red flags.
• Submission Date: If the first submitted date of the file predates the actual release of the software being tested, it’s likely that you’re dealing with recycled, known threats.
• Alternate Names: Watch out for files that have been renamed to unrelated entities. Common names such as update.exe or test.pdf are usually benign but be cautious with unusual strings.

3. Behavioral Analysis

• File Interactions: Examine the files that are created, deleted, or modified by the software. If actions seem unnecessary or suspicious, dig deeper.
• Registry Changes: A legitimate software update shouldn’t be altering critical system functions, such as disabling antivirus protection or task management tools.
• Suspicious Function Calls: Identify which functions are being used. Functions like GetTickCount may be misapplied to identify virtual environments and evade detection—further details can be explored [here](https://www.fireeye.com/blog/threat-research/2011/01/the-dead-giveaways-of-vm