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Tech support scams reported to Microsoft

Teaming up in the war on tech support scams

(Editors note: Erik Wahlstrom spoke about the far-reaching impact of tech support scams and the need for industry-wide cooperation in his RSA Conference 2018 talk Tech Scams: It's Time to Release the Hounds.) Introduction Social engineering attacks like tech support ... continue reading
Windows Defender System Guard runtime attestation architecture

Introducing Windows Defender System Guard runtime attestation

At Microsoft, we want users to be in control of their devices, including knowing the security health of these devices. If important security features should fail, users should be aware. Windows Defender System Guard runtime attestation, a new Windows platform ... continue reading

Tapping the intelligent cloud to make security better and easier

Security
There has been a distinct shift in my conversations with customers over the last year. Most have gone from asking can we still keep our assets secure as we adopt cloud services?, to declaring, we are adopting cloud services in ... continue reading
Hunting down Dofoil with Windows Defender ATP

Hunting down Dofoil with Windows Defender ATP

Dofoil is a sophisticated threat that attempted to install coin miner malware on hundreds of thousands of computers in March, 2018. In previous blog posts we detailed how behavior monitoring and machine learning in Windows Defender AV protected customers from ... continue reading
Why Windows Defender Antivirus is the most deployed in the enterprise

Why Windows Defender Antivirus is the most deployed in the enterprise

Statistics about the success and sophistication of malware can be daunting. The following figure is no different: Approximately 96% of all malware is polymorphic meaning that it is only experienced by a single user and device before it is replaced ... continue reading
Poisoned peer-to-peer app kicked off Dofoil coin miner outbreak

Poisoned peer-to-peer app kicked off Dofoil coin miner outbreak

On March 7, we reported that a massive Dofoil campaign attempted to install malicious cryptocurrency miners on hundreds of thousands of computers. Windows Defender Antivirus, with its behavior monitoring, machine learning technologies, and layered approach to security detected and blocked ... continue reading
Invisible resource thieves: The increasing threat of cryptocurrency miners

Invisible resource thieves: The increasing threat of cryptocurrency miners

The surge in Bitcoin prices has driven widescale interest in cryptocurrencies. While the future of digital currencies is uncertain, they are shaking up the cybersecurity landscape as they continue to influence the intent and nature of attacks. Cybercriminals gave cryptocurrencies ... continue reading
Figure 1: Windows Defender ATP machine timeline view with Windows Defender Exploit Guard event

Behavior monitoring combined with machine learning spoils a massive Dofoil coin mining campaign

Just before noon on March 6 (PST), Windows Defender AV blocked more than 80,000 instances of several sophisticated trojans that exhibited advanced cross-process injection techniques, persistence mechanisms, and evasion methods. Behavior-based signals coupled with cloud-powered machine learning models uncovered this ... continue reading
FinFisher exposed: A researcher’s tale of defeating traps, tricks, and complex virtual machines

FinFisher exposed: A researcher’s tale of defeating traps, tricks, and complex virtual machines

Office 365 Advanced Threat Protection (Office 365 ATP) blocked many notable zero-day exploits in 2017. In our analysis, one activity group stood out: NEODYMIUM. This threat actor is remarkable for two reasons: Its access to sophisticated zero-day exploits for Microsoft ... continue reading
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