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Iran-linked DEV-0343 targeting defense, GIS, and maritime sectors

DEV-0343 is a new activity cluster that the Microsoft Threat Intelligence Center (MSTIC) first observed and began tracking in late July 2021. MSTIC has observed DEV-0343 conducting extensive password spraying against more than 250 Office 365 tenants, with a focus ... continue reading
Presenting Hardware Isolation of Microsoft Edge and Microsoft Office products. Workflow being displayed at the bottom with Device Hardware being the focal point, flowing through Kernel, into the Windows platform before reaching Microsoft Office, Microsoft Edge, and Apps.

Defend against zero-day exploits with Microsoft Defender Application Guard

Zero-day security vulnerabilities—known to hackers, but unknown to software creators, security researchers, and the public—are like gold to attackers. With zero-days, or even zero-hours, developers have no time to patch the code, giving hackers enough access and time to explore ... continue reading

How nation-state attackers like NOBELIUM are changing cybersecurity

This is the first post in a four-part series on the NOBELIUM nation-state cyberattack. Microsoft started telling the industry about this extremely advanced cyberattack in December 2020. The NOBELIUM blog series—which mirrors Microsoft’s four-part video series “Decoding NOBELIUM”—will pull the ... continue reading
Diagram showing structure of Microsoft.IdentityServer.ServiceHost.exe after loading version.dll

FoggyWeb: Targeted NOBELIUM malware leads to persistent backdoor

Microsoft continues to work with partners and customers to track and expand our knowledge of the threat actor we refer to as NOBELIUM, the actor behind the SUNBURST backdoor, TEARDROP malware, and related components. As we stated before, we suspect ... continue reading
Table showing differences between phishing kits and phishing-as-a-service

Catching the big fish: Analyzing a large-scale phishing-as-a-service operation

In researching phishing attacks, we came across a campaign that used a rather high volume of newly created and unique subdomains—over 300,000 in a single run. This investigation led us down a rabbit hole as we unearthed one of the ... continue reading
Graphic illustrates the steps, goals, and initial questions in DART’s ransomware investigation assistance.

A guide to combatting human-operated ransomware: Part 1

This blog is part one of a two-part series focused on how Microsoft DART helps customers with human-operated ransomware. For more guidance on human-operated ransomware and how to defend against these extortion-based attacks, refer to our human-operated ransomware docs page ... continue reading
Screenshot of code showing the original exploit vector

Analyzing attacks that exploit the CVE-2021-40444 MSHTML vulnerability

In August, Microsoft Threat Intelligence Center (MSTIC) identified a small number of attacks (less than 10) that attempted to exploit a remote code execution vulnerability in MSHTML using specially crafted Microsoft Office documents. These attacks used the vulnerability, tracked as ... continue reading

Afternoon Cyber Tea: Learn how to stop misinformation threats from nation-state bad actors

Information has long been wielded as an instrument of national power and influence. In today’s digital world, misinformation can also be just as powerful. On a special episode of Afternoon Cyber Tea with Ann Johnson, Sandra Joyce, Executive Vice President ... continue reading
Screenshot of code showing instance of SSH

A deep-dive into the SolarWinds Serv-U SSH vulnerability

Several weeks ago, Microsoft detected a 0-day remote code execution exploit being used to attack the SolarWinds Serv-U FTP software in limited and targeted attacks. The Microsoft Threat Intelligence Center (MSTIC) attributed the attack with high confidence to DEV-0322, a ... continue reading
Diagram showing attack chain of phishing campaigns that use open redirect links

Widespread credential phishing campaign abuses open redirector links

Microsoft has been actively tracking a widespread credential phishing campaign using open redirector links. Attackers combine these links with social engineering baits that impersonate well-known productivity tools and services to lure users into clicking. Doing so leads to a series ... continue reading