Windows Defender Antivirus cloud protection service: Advanced real-time defense against never-before-seen malware

For cybercriminals, speed is the name of the game. It takes newly released malware an average of just four hours to achieve its goal—steal financial information, extort money, or cause widespread damage. In a recent report, the Federal Trade Commission (FTC) said that cybercriminals will use hacked or stolen information within nine minutes of posting in…

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Exploring the crypt: Analysis of the WannaCrypt ransomware SMB exploit propagation

On May 12, there was a major outbreak of WannaCrypt ransomware. WannaCrypt directly borrowed exploit code from the ETERNALBLUE exploit and the DoublePulsar backdoor module leaked in April by a group calling itself Shadow Brokers. Using ETERNALBLUE, WannaCrypt propagated as a worm on older platforms, particularly Windows 7 and Windows Server 2008 systems that haven’t…

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Windows 10 platform resilience against the Petya ransomware attack

The Petya ransomware attack on June 27, 2017 (which we analyzed in-depth in this blog) may have been perceived as an outbreak worse than last month’s WannaCrypt (also known as WannaCry) attack. After all, it uses the same SMB exploit used by WannaCrypt and adds a second exploit and other lateral movement methods. However, our…

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What’s new in Windows Defender ATP Fall Creators Update

When we introduced Windows Defender Advanced Threat Protection (Windows Defender ATP), our initial focus was to reduce the time it takes companies to detect, investigate, and respond to advanced attacks. The Windows Fall Creators Update represents a new chapter in our product evolution as we offer a set of new prevention capabilities designed to stop…

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Understanding the true size of "Fireball"

Keeping tabs on the movement of cybersecurity threats, understanding the size and scope of attacks, and disrupting cybercriminal campaigns through next-gen technologies are fundamental parts of our day-to-day work at Microsoft Windows Defender Research. So when recent reports of the “Fireball” cybersecurity threat operation were presented as a new discovery, our teams knew differently because…

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Partnering with the AV ecosystem to protect our Windows 10 customers

On Friday May 12th, and for several days afterwards, more than a quarter-million computers around the world fell victim to the ransomware known as WannaCrypt or WannaCry. As that recent event has shown, malicious actors bring nearly boundless time and skill to commit cybercrime that can cause harm to millions of people. That is why…

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Analysis of the Shadow Brokers release and mitigation with Windows 10 virtualization-based security

On April 14, a group calling themselves the Shadow Brokers caught the attention of the security community by releasing a set of weaponized exploits. Shortly thereafter, one of these exploits was used to create wormable malware that we now know as WannaCrypt, which targeted a large number of out-of-date systems and held encrypted files for…

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Windows 10 Creators Update provides next-gen ransomware protection

Multiple high-profile incidents have demonstrated that ransomware can have catastrophic effects on all of us. From personally losing access to your own digital property, to being impacted because critical infrastructure or health care services are unexpectedly unavailable for extended periods of time, destructive attacks have grown in severity and scale on all platforms – including…


WannaCrypt ransomware worm targets out-of-date systems

On May 12, 2017 we detected a new ransomware that spreads like a worm by leveraging vulnerabilities that have been previously fixed. While security updates are automatically applied in most computers, some users and enterprises may delay deployment of patches. Unfortunately, the ransomware, known as WannaCrypt, appears to have affected computers that have not applied…

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