IT Security Policy: USB Drives and External Media

USB drives and external storage devices are a common but often overlooked security risk in small businesses. Here's what you need to know. The risks of unmanaged USB devices: 1. Malware introduction: Plugging in an unfamiliar USB drive can silently install malware on your computer. This is how some of the most damaging cyber attacks have started. 2. Data theft: Employees can easily copy sensitive business data to a USB drive and walk out with it — intentionally or not. 3. Ransomware spread: Some ransomware variants search for and encrypt files on any connected drive, including USB drives. Best practices for USB use in your business: Only use company-approved USB drives Don't plug in USB drives you've found, received as a gift at a trade show, or obtained from unknown sources. Attackers have been known to deliberately leave infected USB drives in parking lots and lobbies. Scan before opening If you must use a USB drive from an external source, right-click it in File Explorer and select "Scan with Microsoft Defender" before opening anything. Use OneDrive/SharePoint instead of USB for file sharing For sharing files between staff or between computers, use OneDrive or SharePoint. This is more secure, keeps version history, and doesn't require physical media. Be cautious about what leaves on USB Before copying sensitive client data, financial records, or personal information to a USB drive, ask whether it's necessary. Could you send it securely via email or SharePoint instead? For businesses needing stricter control: We can configure Windows to block or restrict USB storage devices using Group Policy — only authorized devices would be allowed to connect. This is worth considering for businesses handling sensitive data. Contact us if you'd like to discuss this. If a suspicious USB was plugged in: 1. Do NOT open any files from it 2. Disconnect the USB drive 3. Run a full antivirus scan immediately 4. Call us — we can check for any changes the drive may have made