Most site owners install a security plugin after they've already been hacked. That's backwards. Malware scanners won't stop every attack, but they catch file changes, bad redirects, and known signatures early—when cleanup is still a afternoon, not a week.
What a good scanner should do
- Compare core, theme, and plugin files against clean versions
- Flag unknown PHP in uploads
- Alert you on admin user creation or failed login spikes
- Offer remediation steps, not just scary red banners
1. Wordfence Security
Still the benchmark for many small sites. The free tier includes file scanning, firewall rules, and login hardening. Scans can be resource-heavy on cheap hosting—schedule them for low-traffic hours.
Best for: general-purpose protection when you want one plugin to do a lot.
2. Sucuri Security
Strong on malware detection and blacklist monitoring. The free plugin handles hardening and audit logs; paid plans add remote scanning and cleanup. If your host already bundles Sucuri, use it instead of stacking duplicate firewalls.
Best for: sites that already had an incident and need ongoing monitoring.
3. MalCare
Cloud-based scanning reduces load on your server. One-click malware removal is the selling point—useful if you don't want to SSH into production at midnight.
Best for: agencies managing multiple client sites.
4. iThemes Security (Solid Security)
Less flashy on malware than Wordfence but solid on brute-force protection, two-factor, and file change detection. Pairs well with a separate scanner if you want defense in depth.
Best for: tightening login surface while keeping scans lighter.
5. WPScan (with caution)
WPScan focuses on known vulnerabilities in plugins and themes. It's not a full file integrity scanner alone, but it answers "am I running a plugin with a published CVE?" Run it alongside a traditional scanner.
Best for: developers who update plugins weekly and want vulnerability intel.
How I set this up on client sites
- One primary scanner (Wordfence or Sucuri), not three at once
- Disable file editing in wp-config:
define('DISALLOW_FILE_EDIT', true); - Separate admin account from daily editor account
- Off-site backups before every major plugin update
- Review scan reports monthly—even "clean" weeks matter for baselines
False positives and hosting limits
Scanners flag legitimate custom code in themes. Whitelist after manual review, don't blindly ignore. Shared hosts may kill long scans; use incremental or remote scanning modes when available.
AdSense angle
Google disapproves sites with malicious redirects or injected ads. A scanner won't get you approved by itself, but it prevents the sudden disapproval that comes when pharma spam pages appear overnight. Pair security with original content and clear policy pages.
Signs you were hacked before the scanner tells you
Unexpected admin users, unknown plugins in wp-admin, redirects on mobile only, or new files in wp-content/uploads with .php extensions. Run a scan immediately and pull offline backups if checkout or login forms were affected.
Cleaning vs reinstalling
On small blogs, reinstalling WordPress core, replacing wp-content/themes and plugins from clean sources, and restoring uploads from a known-good backup is often faster than chasing obfuscated malware in a nulled theme. Nulled themes and plugins remain the top infection vector I see on WordPress sites applying for monetization.
Hosting-level security
Ask your host if Imunify360, ModSecurity, or WAF rules are enabled. Plugin scanners complement host tools—they don't replace them. Managed WordPress hosts often include malware removal in the plan; use that before buying overlapping premium scanners.
Reporting for AdSense reinstatement
If disapproved for malicious content, document remediation: scan logs, removed files, password resets, and date of clean bill of health. Google's review team responds to evidence, not promises.