Warlock Ransomware Exploits SharePoint Flaws to Hit Critical Infrastructure in Iberian and Latin American Nations

Cyber‑security researchers have linked a surge of ransomware incidents targeting essential services in Portugal, Spain and several Spanish‑speaking countries to the Warlock malware family. The attacks, which have disrupted utilities, transportation and public administration systems, appear to be driven by the group’s systematic exploitation of unpatched Microsoft SharePoint vulnerabilities.

Symantec's Threat Hunter Team released a detailed analysis last week, noting that the perpetrators are leveraging a mix of known and zero‑day flaws in SharePoint to gain footholds within corporate networks. Once inside, the ransomware encrypts data and demands payment, often threatening to leak sensitive information if the ransom is not met. The report emphasizes that the attackers are employing automated scripts to scan for vulnerable SharePoint installations across a wide geographic area.

Authorities in Portugal and Spain have confirmed that at least a dozen critical‑infrastructure providers experienced service interruptions in the past month, with some reporting temporary shutdowns of water treatment facilities and regional transit hubs. While no public statements have disclosed the exact financial impact, officials say the incidents have prompted emergency response measures and heightened scrutiny of legacy software configurations.

The emergence of Warlock in the Iberian Peninsula mirrors a broader trend of ransomware groups focusing on high‑value targets in regions where cybersecurity budgets may lag behind those of larger economies. Experts warn that the reliance on SharePoint for document management and internal collaboration creates a lucrative attack surface, especially when organizations delay applying security patches or lack comprehensive monitoring of privileged accounts.

In response, cybersecurity agencies across the affected nations are urging firms to conduct immediate vulnerability assessments, prioritize the deployment of Microsoft’s latest security updates, and adopt multi‑factor authentication for SharePoint access. The Symantec report also recommends network segmentation and regular backups stored offline to mitigate the risk of encryption. As investigators continue to trace the origins of the Warlock campaign, industry observers anticipate that pressure on policymakers will increase, potentially leading to stricter regulations on ransomware preparedness and disclosure practices.