Disrupting active exploitation of on-premises SharePoint vulnerabilities
Microsoft has observed two named Chinese nation-state actors, Linen Typhoon and Violet Typhoon, exploiting vulnerabilities targeting internet-facing SharePoint servers.
Microsoft Sentinel
Microsoft Sentinel is a security information and event management (SIEM) and unified data lake platform that helps you uncover and quickly respond to threats. Explore case studies, product updates, and best practices to help you secure your multicloud environment.
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Threat actors leverage tax season to deploy tax-themed phishing campaigns
As Tax Day approaches in the United States on April 15, Microsoft has detected several tax-themed phishing campaigns employing various tactics. -
Code injection attacks using publicly disclosed ASP.NET machine keys
Microsoft Threat Intelligence observed limited activity by an unattributed threat actor using a publicly available, static ASP. -
Frequent freeloader part II: Russian actor Secret Blizzard using tools of other groups to attack Ukraine
Since January 2024, Microsoft has observed Secret Blizzard using the tools or infrastructure of other threat groups to attack targets in Ukraine and download its custom backdoors Tavdig and KazuarV2. Modernize your Security Operations Center with Microsoft Sentinel
Microsoft Sentinel is a cloud-native SIEM solution powered by AI and automation that delivers intelligent security analytics across your entire enterprise.
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Midnight Blizzard conducts large-scale spear-phishing campaign using RDP files
Since October 22, 2024, Microsoft Threat Intelligence has observed Russian threat actor Midnight Blizzard sending a series of highly targeted spear-phishing emails to individuals in government, academia, defense, non-governmental organizations, and other sectors. -
Storm-0501: Ransomware attacks expanding to hybrid cloud environments
August 27, 2025 update: Storm-0501 has continuously evolved to achieve sharpened focus on cloud-based TTPs as their primary objective shifted from deploying on-premises endpoint ransomware to using cloud-based ransomware tactics. -
North Korean threat actor Citrine Sleet exploiting Chromium zero-day
Microsoft identified a North Korean threat actor exploiting a zero-day vulnerability in Chromium (CVE-2024-7971) to gain remote code execution (RCE) in the Chromium renderer process. -
Ransomware operators exploit ESXi hypervisor vulnerability for mass encryption
Microsoft Security researchers have observed a vulnerability used by various ransomware operators to get full administrative access to domain-joined ESXi hypervisors and encrypt the virtual machines running on them. Retain Microsoft Security Experts
Microsoft Security Experts are now available to strengthen your team with managed security services. Learn how to defend against threats with security experts.
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Onyx Sleet uses array of malware to gather intelligence for North Korea
On July 25, 2024, the United States Department of Justice (DOJ) indicted an individual linked to the North Korean threat actor that Microsoft tracks as Onyx Sleet. -
Moonstone Sleet emerges as new North Korean threat actor with new bag of tricks
Microsoft has identified a new North Korean threat actor, now tracked as Moonstone Sleet (formerly Storm-1789), that combines many tried-and-true techniques used by other North Korean threat actors, as well as unique attack methodologies to target companies for its financial and cyberespionage objectives. -
Analyzing Forest Blizzard’s custom post-compromise tool for exploiting CVE-2022-38028 to obtain credentials
Since 2019, Forest Blizzard has used a custom post-compromise tool to exploit a vulnerability in the Windows Print Spooler service that allows elevated permissions. -
Microsoft unveils expansion of AI for security and security for AI at Microsoft Ignite
The new era of AI is here. At Microsoft Ignite, we will be announcing new cybersecurity capabilities to help you thrive in this new age.
