Fire Ant Hackers Exploiting Vulnerabilities in VMware ESXi and vCenter to Infiltrate Organizations

A sophisticated espionage campaign dubbed “Fire Ant” demonstrates previously unknown capabilities in compromising VMware virtualization infrastructure.  Since early 2025, this threat actor has systematically targeted VMware ESXi hosts, vCenter servers, and network appliances using hypervisor-level techniques that evade traditional endpoint…

New CastleLoader Attack Uses Cloudflare-Themed Clickfix Method to Compromise Windows Systems

A newly identified loader malware dubbed CastleLoader has emerged as a significant threat since early 2025, rapidly evolving into a distribution platform for various information stealers and remote access trojans (RATs). Leveraging sophisticated phishing tactics under T1566 and drive-by compromise…

Multiple Hacker Groups Exploit SharePoint 0-Day Vulnerability in the Wild

Microsoft has confirmed that a pair of zero-day vulnerabilities in on-premises SharePoint Server, collectively dubbed ToolShell, are under active exploitation by diverse threat actors ranging from opportunistic cybercriminals to sophisticated nation-state advanced persistent threat (APT) groups. ToolShell encompasses CVE-2025-53770, a…