Scans Target Wordfence‑Protected WordPress Sites, Indicating Reconnaissance of WAF Deployments
What Happened — Beginning on September 28, 2024, SANS Internet Storm Center sensors recorded a modest wave of automated scans for the file wordfence-waf.php. The script is created by Wordfence, a widely‑deployed Web Application Firewall (WAF) for WordPress. The activity is limited to probing whether a site runs Wordfence, a classic reconnaissance step before a more focused attack.
Why It Matters for Trust & Control Assurance
- Continuous monitoring programs must capture and alert on anomalous requests to security‑control files (e.g., WAF scripts) to prove that detection controls are operating.
- Evidence of such scans feeds a defensible audit trail showing you are actively monitoring for attempts to bypass or enumerate your protective controls.
- Mapping this event to the “monitoring and logging” control objective demonstrates readiness across multiple frameworks (e.g., NIST CSF 2.0) with a single piece of evidence.
Who Is Affected — Any organization that runs WordPress sites protected by Wordfence, including media publishers, e‑commerce platforms, SaaS providers, NGOs, and public‑sector portals.
Recommended Actions
- Ensure web‑server logs capture requests for
wordfence-waf.phpand forward them to a SIEM or centralized log repository. - Create a detection rule that flags repeated requests for the WAF script from the same source IP range.
- Verify that Wordfence is fully updated and that its WAF ruleset is hardened against enumeration techniques.
- Incorporate the log‑collection requirement into your continuous‑control‑assurance workflow to produce audit‑ready evidence.
Technical Notes — The scans are simple HTTP GET requests looking for the presence of wordfence-waf.php. No vulnerability (CVE) is being exploited; the activity is purely reconnaissance. No data exfiltration or system compromise has been reported. Source: SANS ISC Diary