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Project

Microsoft Defender for Office 365

Microsoft's cloud-based email and collaboration security service that filters phishing, malware, and spam across Office 365 and detects evasion techniques.

Known aliases

  • Defender for Office 365
  • MDO
  • Microsoft Defender for Office
  • Office 365 ATP

Current stories

buildOne report1 publisher

MFA-relaying proxy kits make up 44.6% of phishing techniques in Microsoft's 2026 report

Microsoft's 2026 Digital Defense Report puts MFA-relaying proxy kits at 44.6% of phishing techniques, as phishing rose to 23% of its incident cases. SMS codes and push approvals pass straight through those proxies, so protecting company email now means passkeys or FIDO2 keys, starting with admins and finance staff.

Publishers:dev.to

Reality

Evidence62
Adoption
Not scored
Hype gap+5
Incentives40
Confidence55
buildConfirmed3 publishers

Spammers split "funding" with an invisible Unicode tag to slip past keyword filters

The Unicode tag block was a jailbreak trick before it was a spam trick. Microsoft's signature for it went from 21,000 hits in a day to more than 2.3 million three days later, and NFC normalization does not strip it.

Publishers:dev.to hwbusters.com thenewstack.io

Perspective Coverage

3 publishers
Builder
Builder 50%
Operator
Operator 43%
Investor
Investor 7%

Reality

Evidence68
Adoption50
Hype gap+30
Incentives60
Confidence65
buildOne report1 publisher

An external app with user consent reads mail without holding an account in the tenant

Microsoft's guidance on illicit consent grants says password resets and MFA do not touch the access, and it sends admins to the Purview audit log, where the entry can take up to 24 hours to appear.

Publishers:learn.microsoft.com

Reality

Evidence64
Adoption
Not scored
Hype gap−12
Incentives58
Confidence66
leadershipOne report1 publisher

Attackers repurposed prompt injection's invisible Unicode to break email keyword matching

Microsoft's hunt for email-borne prompt injection instead surfaced a three-month phishing campaign hiding tag characters inside words like funding, which puts both problems on one detection team's desk.

Publishers:microsoft.com

Reality

Evidence58
Adoption62
Hype gap+12
Incentives68
Confidence55
securityConfirmed4 publishers

Phishing crews adopt the AI red team's invisible Unicode trick to break keyword filters

A hunting signature Microsoft built to catch prompt injection in email started firing on ordinary phishing instead, where invisible tag characters were splitting lure words like "funding" so filters never parsed them.

Perspective Coverage

4 publishers
Builder
Builder 31%
Operator
Operator 60%
Investor
Investor 9%

Reality

Evidence64
Adoption72
Hype gap+16
Incentives74
Confidence66