The threat involves a malicious WordPress plugin named 'Modern Recent Posts' that targets WordPress administrators by injecting malicious JavaScript from an external domain (https://persistancejs.store/jsplug/plugin.php). This script triggers fake browser update pop-ups designed to socially engineer administrators into downloading malware onto their Windows machines. The attack vector is highly targeted, affecting only logged-in administrators, which indicates a focus on high-value targets with elevated privileges. The plugin has built-in persistence mechanisms and can self-update, allowing it to maintain a foothold and adapt over time. The use of trusted browser update prompts exploits user trust and familiarity, increasing the likelihood of successful infection. The campaign's stealthy nature and targeted delivery reduce detection chances and complicate incident response. No CVE or known exploits in the wild have been reported yet, but the sophistication and persistence features suggest a well-developed threat. The malicious JavaScript injection and external resource loading also pose risks of further payload delivery or command and control communication. This threat highlights the risks of installing unverified plugins and the importance of monitoring administrative activity on WordPress sites, especially those managed on Windows platforms.

For European organizations, this threat can lead to local machine compromise of WordPress administrators' Windows devices, potentially resulting in credential theft, lateral movement, and further network infiltration. The persistence and self-update capabilities increase the difficulty of eradication, raising the risk of prolonged exposure. Compromise of administrative accounts could lead to website defacement, data theft, or use of the site as a launchpad for additional attacks. Given the reliance on social engineering, the threat exploits human factors, which can undermine technical defenses. Organizations with critical web infrastructure or e-commerce platforms running WordPress are particularly vulnerable, as disruption or data breaches could have significant operational and reputational consequences. The injection of malicious JavaScript also risks exposing site visitors if the plugin's scope expands. The targeted nature means attackers may focus on high-profile or strategic European entities, amplifying potential geopolitical or economic impacts.

1. Immediately audit installed WordPress plugins and remove any unverified or suspicious plugins, especially 'Modern Recent Posts'. 2. Block network access to the malicious domain https://persistancejs.store and related URLs at the firewall or DNS level to prevent JavaScript payload delivery. 3. Enforce strict plugin installation policies, allowing only plugins from trusted sources and regularly reviewing plugin permissions. 4. Educate WordPress administrators about the risks of fake browser update prompts and social engineering tactics, emphasizing caution before downloading updates or software. 5. Implement endpoint detection and response (EDR) solutions on administrator Windows machines to detect and respond to suspicious activities or persistence mechanisms. 6. Regularly monitor WordPress administrative sessions and logs for unusual activity or unauthorized plugin installations. 7. Use multi-factor authentication (MFA) for WordPress admin accounts to reduce the risk of credential compromise. 8. Maintain up-to-date backups of WordPress sites and administrator machines to enable recovery in case of compromise. 9. Conduct periodic security assessments and penetration tests focusing on WordPress environments and administrator endpoints. 10. Consider isolating administrative access to WordPress sites via VPNs or dedicated management networks to reduce exposure.