Demystifying VirusTotal Results: Insights Beyond False Positives

Understanding the nuances of VirusTotal (VT) results can be a complex task, especially for those who may not be familiar with the intricacies of malware detection. I used to approach VT outcomes with the assumption that if only a handful of antivirus solutions flagged a file, it likely indicated a false positive. However, recent insights have reshaped my perspective, compelling me to delve deeper into what the results truly mean.

For anyone seeking a foundational overview of VirusTotal, I highly recommend checking out the informative video by MalwareAnalysisForHedgehogs here. It serves as an excellent starting point for understanding the platform’s functionality.

Breaking Down VirusTotal Results

1. Detection Patterns

• Reanalysis is Key: Malware definitions are subject to change, so if your file hasn’t been scanned for a while, consider running it through VT again. This will provide updated results and insights based on the latest threat intelligence.
• Interpreting Malware Tags: Pay attention to the naming conventions used by different antivirus vendors. Indicators such as “not-a-virus” suggest that while the file may be potentially harmful, it isn’t malicious by nature—though interpretations can vary by vendor.

2. File Details

• Verify File Authenticity: Ensure that the file type matches its expected format. A discrepancy could be a warning sign.
• Examine Submission Dates: Check when the file was first submitted to VT. If this predates the official release of the software in question, it could indicate that the detection corresponds to previously known or recycled malware.
• Assessment of File Names: Review the names associated with the file. Irrelevant or generic filenames could signal nefarious intent, especially names like update.exe, test.pdf, or random strings.

3. Examining Behavior

• Deployment Analysis: Investigate what files the suspicious software drops, deletes, or writes. Knowing whether it operates outside its intended scope can reveal potential malicious actions.
• Registry Interactions: Be wary if a software update attempts to modify critical system features, such as disabling Windows Defender or accessing the command prompt and task manager without justification.
• Highlighted Calls: Watch for specific function calls that may be designed to evade detection, such as GetTickCount used