You're reading from Mastering Microsoft 365 Defender

Product typeBook

Published inJul 2023

PublisherPackt

ISBN-139781803241708

Edition1st Edition

Concepts

Cybersecurity

Authors (2):

Ru Campbell

Viktor Hedberg

View More author details

Block at first sight

BAFS is one of the most visible ways cloud-delivered protection can be applied practically. Malicious executable files are a serious concern, and this includes non-portable ones such as Office macros. As of Windows 10 1803, an MDAV client with BAFS enabled will query the hash value of executables with mark of the web (MOTW) against the cloud protection service. If the file is new to the cloud telemetry dataset but may pose a risk, it is locked for up to 1 minute and a sample is uploaded (based on your tenant’s geography) for further analysis. If a verdict of malicious is returned before this timeout period, execution is blocked. Decisions are usually returned in milliseconds based on metadata, but the additional time allows for analysis at levels further along the processing chain.

What is MOTW?

Files downloaded from the internet (based on zones) are given a MOTW, contained in an NTFS stream, by Windows, if the downloading/extracting software supports...

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Mastering Microsoft 365 Defender

Published in: Jul 2023Publisher: PacktISBN-13: 9781803241708

Authors (2)

Ru Campbell

Ruairidh (Ru) Campbell is a Microsoft Security MVP and leads Microsoft consultancy at Threatscape. At Threatscape, Ru develops, delivers, and manages offerings and professional services for cybersecurity, compliance, identity, and management. In the cybersecurity community, Ru runs the Microsoft 365 Security & Compliance user group and his blog (campbell.scot), regularly speaks at other user groups and conferences, and contributes to well-known industry publications such as Practical 365. Ru holds 14 Microsoft certifications and a B.Sc. (Distinction) in computer networking from the University of the West of Scotland. Away from cybersecurity, he is a petrolhead who enjoys heavy metal and hiking around Scotland with his wife.
Read more about Ru Campbell

Viktor Hedberg

Viktor Hedberg is a Microsoft Security MVP and senior consultant at Truesec. At Truesec, Viktor works with proactive security measures within the Microsoft sphere of technologies, by delivering workshops on best practices and by his deep technical expertise in these areas. In the cybersecurity community, Viktor runs his blogs at Truesec (Experts – viktor-hedberg). Alongside this, he is one of the hosts of the Swedish Windows Security user group, as well as a co-host of the Swedish podcast The Nerd Herd. He is a frequent speaker at both conferences and user groups around the world, focusing on matters of Microsoft Security. Viktor holds numerous Microsoft certifications, as well as being a Microsoft Certified Trainer. Away from cybersecurity, Viktor is a family man, spending most of his time with his wife and three kids, as well as enjoying football, both as a practitioner and as a fan. Heavy metal has been part of his life since his early teens.
Read more about Viktor Hedberg

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