In order to effectively scan uploaded files for malware before processing, you can use the following methods:
1. Integrate Antivirus APIs
Use third-party antivirus scanning services, like VirusTotal or ClamAV, to scan files in real-time.
const axios = require('axios');
const apiKey = 'your_api_key';
const filePath = 'path_to_file';
axios.post('https://www.virustotal.com/api/v3/files', {
headers: {
'x-apikey': apiKey
},
data: filePath
})
.then(response => console.log(response.data))
.catch(error => console.error('Error scanning file:', error));
2. Use Local Antivirus Tools (ClamAV)
Integrate ClamAV, an open-source antivirus tool, to scan files locally.
Install and use with clamd for server-side scanning.
clamscan --infected --remove file_to_scan
3. File Signature Checking
Check the file's signature (magic bytes) to ensure the file is what it claims to be.
const fs = require('fs');
const fileBuffer = fs.readFileSync('uploaded_file');
if (fileBuffer.toString('hex', 0, 4) !== 'ffd8') {
throw new Error('Invalid file signature');
}
4. Content Scanning for Suspicious Patterns
Scan for suspicious patterns inside files, especially in text-based files (HTML, XML, etc.).
const fs = require('fs');
const fileContent = fs.readFileSync('uploaded_file', 'utf8');
if (fileContent.includes('eval(') || fileContent.includes('exec(')) {
throw new Error('Suspicious content found');
}
5. Use Sandboxing for Suspicious Files
- For high-risk files, execute them in a sandboxed environment to monitor their behavior without affecting your system.
- You can use Docker containers to run and monitor files safely.