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Microsoft security intelligence

Security research and threat intelligence from our global network of security experts.

A female architect sitting at an office desk showing Windows 365 and its Welcome screen on dual desktop monitors. Shown on Windows 11.

January 26, 2023 • 16 min read

Introducing kernel sanitizers on Microsoft platforms

We share technical details of our work on the AddressSanitizer (ASAN) and how it contributes to durably improving software quality and security at Microsoft.

A man standing in their workstation with multiple computer screens.

December 21, 2022 • 12 min read

Microsoft research uncovers new Zerobot capabilities

The Microsoft Defender for IoT research team details information on the recent distribution of a Go-based botnet, known as Zerobot, that spreads primarily through IoT and web-application vulnerabilities.

December 19, 2022 • 9 min read

Gatekeeper’s Achilles heel: Unearthing a macOS vulnerability

Microsoft discovered a vulnerability in macOS, referred to as “Achilles”, allowing attackers to bypass application execution restrictions enforced by the Gatekeeper security mechanism.

Male first line worker using laptop folded open as tablet, standing on home furnishings sales floor, looking at a wall-mounted customer support monitor which displays an advertisement for bedding. A desktop monitor sits on a desk behind him.

December 15, 2022 • 8 min read

MCCrash: Cross-platform DDoS botnet targets private Minecraft servers

The Microsoft Defender for IoT research team analyzed a cross-platform botnet that infects both Windows and Linux systems from PCs to IoT devices, to launch distributed denial of service (DDoS) attacks against private Minecraft servers.

female developer wearing headphones; coding at her PC workspace in an enterprise office, using Visual Studio on a multi-monitor set up.

December 12, 2022 • 10 min read

IIS modules: The evolution of web shells and how to detect them

This blog aims to provide further guidance on detecting malicious IIS modules and other capabilities that you can use during your own incident response investigations.

a person sitting at a table using a laptop computer

December 7, 2022 • 4 min read

Mitigate threats with the new threat matrix for Kubernetes

The updated threat matrix for Kubernetes comes in a new format that simplifies usage of the knowledge base and with new content to help mitigate threats.

a person sitting on a bench in front of a window

December 6, 2022 • 17 min read

DEV-0139 launches targeted attacks against the cryptocurrency industry

Microsoft security researchers investigate an attack where the threat actor, tracked DEV-0139, used chat groups to target specific cryptocurrency investment companies and run a backdoor within their network.

a man and a woman standing in a room

November 22, 2022 • 1 min read

Join us at InfoSec Jupyterthon 2022

Join our community of analysts and engineers at the third annual InfoSec Jupyterthon 2022, an online event taking place on December 2 and 3, 2022.

a person standing in front of a building

November 22, 2022 • 6 min read

Vulnerable SDK components lead to supply chain risks in IoT and OT environments

As vulnerabilities in network components, architecture files, and developer tools have become an increasingly popular attack vector to leverage access into secure networks and devices, Microsoft identified such a vulnerable component and found evidence of a supply chain risk that might affect millions of organizations and devices.

a man standing in front of a computer

November 17, 2022 • 7 min read

DEV-0569 finds new ways to deliver Royal ransomware, various payloads

DEV-0569’s recent activity shows their reliance on malvertising and phishing in delivering malicious payloads. The group’s changes and updates in delivery and payload led to distribution of info stealers and Royal ransomware.

Male developer coding in front of two monitors at desk in office. Programming code shown on both monitors.

November 16, 2022 • 9 min read

Token tactics: How to prevent, detect, and respond to cloud token theft

As organizations increase their coverage of multifactor authentication (MFA), threat actors have begun to move to more sophisticated techniques to allow them to compromise corporate resources without needing to satisfy MFA. Recently, the Microsoft Detection and Response Team (DART) has seen an increase in attackers utilizing token theft for this purpose.

Female datacenter employee performs maintenance in datacenter cold aisle.

November 15, 2022 • 5 min read

2022 holiday DDoS protection guide

The holiday season is an exciting time for many people as they get to relax, connect with friends and family, and celebrate traditions. Organizations also have much to rejoice about during the holidays (for example, more sales for retailers and more players for gaming companies). Unfortunately, cyber attackers also look forward to this time of year to celebrate an emerging holiday tradition—distributed denial-of-service (DDoS) attacks.

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