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FileScan

FileScan

Help

01

About FileScan

FileScan is a free online service that scans uploaded files for viruses and malware using the ClamAV antivirus engine.

02

How to use

1. Drag & drop a file, click to browse, or paste with ⌘/Ctrl + V. 2. Upload and scanning start automatically. 3. See the verdict — green for clean files, red when a threat is detected. 4. Use the SHA-256 hash to get a second opinion on VirusTotal.

03

Checking emails for phishing

Save an email as an .eml file and upload it to check it against known phishing emails and for spoofed links (where the URL shown differs from the real destination). [How to save as .eml] • Gmail: open the email, click "⋮" → "Download message" • Outlook (web / new Outlook): open the email, click "…" (More actions) → "Save as" or "Download" • Apple Mail (Mac): File → Save As → choose "Raw Message Source" as the format • Thunderbird: File → Save As → File Classic Outlook for Windows saves .msg files, and phone mail apps can't save .eml, so save the email from a web or desktop mail client instead. Spoofed links impersonating major brands (Amazon, Rakuten, major banks, card issuers, carriers, delivery companies and more) are detected, but text-only links like "Log in here" and QR-code tricks can't be detected.

04

About ClamAV

ClamAV is an open-source antivirus engine capable of detecting trojans, viruses, malware, and other threats. The virus definition database is updated regularly.

05

Privacy

Uploaded files are processed in memory only and discarded once the scan completes. File contents are never shared with third parties. The SHA-256 hash is calculated inside your browser.

06

Limitations

The maximum file upload size is 10MB. All file formats are supported, but 100% detection is not guaranteed. For critical files, we recommend verifying with multiple security tools.

Detection name

Heuristics.Structured.CreditCardNumber

Credit card numbers

Risk
Informational
Verdict
Sensitive data

Name breakdown

  1. HeuristicsPrefix
  2. StructuredDetail
  3. CreditCardNumberDetail

Overview

This comes from ClamAV's Structured Data Detection feature. It means the file contains at least a certain number of digit sequences that look like credit card numbers (numbers with a valid check digit).

It is not a virus or malware — it's a data-loss-prevention (DLP) feature.

What to do if it's detected

  1. 01You don't need to delete the file.
  2. 02Check whether card numbers were included unintentionally (for example, in a customer data export).
  3. 03Before sending the file outside your organization or publishing it, consider masking the numbers or password-protecting the file.
  4. 04If it contains many numbers you don't recognize, check where the file came from.

Could it be a false positive?

Digit sequences can match the card-number format by coincidence, so false positives are relatively common (invoice numbers, serial numbers, statistical data, etc.).

Related detections

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