Storm-0501’s evolving techniques lead to cloud-based ransomware
Financially motivated threat actor Storm-0501 has continuously evolved their campaigns to achieve sharpened focus on cloud-based tactics, techniques, and procedures (TTPs).
Ransomware
Ransomware as a service ecosystems make it easier for attackers of any skill to launch effective attacks. Learn how these threats work—and how to detect, contain, and recover from them.
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Unveiling RIFT: Enhancing Rust malware analysis through pattern matching
As threat actors are adopting Rust for malware development, RIFT, an open-source tool, helps reverse engineers analyze Rust malware, solving challenges in the security industry. -
Exploitation of CLFS zero-day leads to ransomware activity
Microsoft Threat Intelligence Center (MSTIC) and Microsoft Security Response Center (MSRC) have discovered post-compromise exploitation of a newly discovered zero-day vulnerability in the Windows Common Log File System (CLFS) against a small number of targets. -
Cyber Signals Issue 8 | Education under siege: How cybercriminals target our schools
This edition of Cyber Signals delves into the cybersecurity challenges facing classrooms and campuses, highlighting the critical need for robust defenses and proactive measures. 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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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. -
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. -
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. -
Threat actors misusing Quick Assist in social engineering attacks leading to ransomware
Microsoft Threat Intelligence has observed Storm-1811 misusing the client management tool Quick Assist to target users in social engineering attacks that lead to malware like Qakbot followed by Black Basta ransomware deployment. 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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Octo Tempest crosses boundaries to facilitate extortion, encryption, and destruction
Microsoft has been tracking activity related to the financially motivated threat actor Octo Tempest, whose evolving campaigns represent a growing concern for many organizations across multiple industries. -
Automatic disruption of human-operated attacks through containment of compromised user accounts
User containment is a unique and innovative defense mechanism that stops human-operated attacks in their tracks. -
Malware distributor Storm-0324 facilitates ransomware access
The threat actor that Microsoft tracks as Storm-0324 is a financially motivated group known to gain initial access using email-based initial infection vectors and then hand off access to compromised networks to other threat actors. -
Storm-0978 attacks reveal financial and espionage motives
Microsoft has identified a phishing campaign conducted by the threat actor tracked as Storm-0978 targeting defense and government entities in Europe and North America.
