Navigating VirusTotal Results: Clarifying Misconceptions About Detection

Understanding how to interpret the results from VirusTotal can be critical for anyone working with file analysis and cybersecurity. A common misconception is that a file flagged by only a few antivirus engines is likely a false positive. This notion, while comforting, can lead to oversight regarding potentially harmful files. Having recently updated my own perspective on this matter, I want to share insights that may help others refine their analysis process.

The Importance of Vigilance in Detection

Before diving into the details, I recommend watching a comprehensive video by MalwareAnalysisForHedgehogs that provides a solid overview of VirusTotal’s functionalities: Watch here.

Key Factors to Consider in Detection

1. Reanalyze Frequently: Virus signatures evolve, and detection capabilities improve over time. If a file hasn’t been freshly analyzed, it’s wise to request a new scan, as VirusTotal maintains a history of previous scans that can inform your assessment.

2. Evaluate malware Labels: Some antivirus solutions might label a file as “not-a-virus” which indicates that, while the file might behave like malware, it isn’t inherently malicious. Understanding these distinctions can help clarify whether the detected issue is of real concern.

Detailed Analysis Steps

• Confirm File Authenticity: Ensure that the file type matches its identified format; discrepancies could be a sign of malicious intent.

• Examine Submission Dates: If the submission date predates the actual release of the file or Software you are examining, it might indicate the presence of recycled malware that is being repurposed for new attacks.

• Look for Renaming Patterns: If a file appears under various names, particularly if they are seemingly unrelated to its function, it may be a case of renamed malware. While names like update.exe or test.pdf can often be dismissed, vigilance is critical.

Behavioral Indicators

• Monitor File Interactions: Pay close attention to what files are being created, deleted, or altered by the program. Unusual file activity could signal malicious behavior.

• Registry Checks: Typical Software updates should not disable critical system functions such as Windows Defender, command prompt, or task manager. Red flags in these areas warrant further investigation.

• Analyze Code Behavior: Highlighted calls within the code can indicate attempts to evade detection. For instance