Security News > 2020 > May > Clever Phishing Attack Bypasses MFA to Nab Microsoft Office 365 Credentials
A new phishing campaign can bypass multi-factor authentication on Office 365 to access victims' data stored on the cloud and use it to extort a Bitcoin ransom or even find new victims to target, security researchers have found.
The attack is different than a typical credential harvester in that it attempts to trick users into granting permissions to the application, which can bypass MFA, he said.
The most basic attack can steal all the victims' email and access cloud hosted documents containing sensitive or confidential information.
Applications that want to access Office 356 data on behalf of a user do so through Microsoft Graph authorizations, but must first obtain an access token from the Microsoft Identity Platform, Hernandez explained.
The entire URL used in the attack includes key parameters that show how the attacker can trick a victim into giving a rogue application permissions to access his or her account.
News URL
https://threatpost.com/phishing-campaign-allows-for-mfa-bypass-on-office-365/155864/
Related news
- Phishing Campaigns Use Real-Time Checks to Validate Victim Emails Before Credential Theft (source)
- Microsoft blocks ActiveX by default in Microsoft 365, Office 2024 (source)
- Gamma AI Platform Abused in Phishing Chain to Spoof Microsoft SharePoint Logins (source)
- Microsoft: Office 2016 and Office 2019 reach end of support in October (source)
- Windows NTLM hash leak flaw exploited in phishing attacks on governments (source)
- CVE-2025-24054 Under Active Attack—Steals NTLM Credentials on File Download (source)
- Three Reasons Why the Browser is Best for Stopping Phishing Attacks (source)
- Phishing detection is broken: Why most attacks feel like a zero day (source)
- DPRK Hackers Steal $137M from TRON Users in Single-Day Phishing Attack (source)
- Low-tech phishing attacks are gaining ground (source)