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Protect Your Business, Beware of Malicious Microsoft OAuth Apps

Cybercriminals are constantly evolving their tactics, and the latest threat targeting businesses involves malicious Microsoft OAuth apps. These apps, disguised as legitimate services like Adobe and DocuSign, are being used to steal Microsoft 365 credentials and deliver malware. Understanding how these attacks work and how to protect your accounts is crucial for keeping your business safe.

How the Attack Works

Proofpoint researchers recently uncovered a campaign where attackers promote fake OAuth apps that appear to be Adobe Drive, Adobe Drive X, Adobe Acrobat, or DocuSign. These fraudulent apps request seemingly harmless permissions such as:

  • Profile: Full name, user ID, profile picture, and username
  • Email: Primary email address (without inbox access)
  • OpenID: Confirmation of user identity and retrieval of Microsoft account details

By requesting only limited permissions, these apps avoid suspicion while still gathering enough data to launch targeted phishing attacks. Once permission is granted, users are redirected to malware downloads or phishing pages designed to steal their Microsoft 365 login credentials.

What to Watch Out For

These phishing campaigns are often sent from compromised email accounts belonging to charities or small businesses, making them appear more trustworthy. Common red flags include:

  • Emails that reference urgent RFPs or contract requests
  • Unexpected OAuth app permission requests
  • Redirects to unfamiliar login pages after granting permissions
  • Suspicious login activity shortly after authorizing an app

How to Keep Your Microsoft 365 Account Safe

To prevent falling victim to these attacks, follow these best practices:

  1. Always verify OAuth app permission requests. Before granting access, double-check the app’s legitimacy and origin.
  2. Monitor your authorized apps. Regularly review the apps connected to your Microsoft account by visiting myapplications.microsoft.com → “Manage your apps” → Revoke any unrecognized apps.
  3. Enable multi-factor authentication (MFA). MFA adds an extra layer of security, making it harder for attackers to access accounts even if they obtain login credentials.
  4. Limit user consent permissions. Microsoft 365 administrators can restrict third-party OAuth apps by navigating to Enterprise ApplicationsConsent and Permissions → Set “Users can consent to apps” to No.
  5. Stay vigilant against phishing emails. Train employees to recognize phishing tactics, including social engineering techniques like the popular “ClickFix” scam used in these attacks.

Protect Your Business with GeorgiaMSP

Securing your Microsoft 365 accounts and business data requires a proactive approach. GeorgiaMSP provides comprehensive cybersecurity solutions to help small businesses defend against phishing attacks, malware, and unauthorized access. Our managed IT security services include: ✅ Advanced threat monitoring to detect suspicious activity early ✅ User training & awareness programs to prevent phishing attacks ✅ Security policy enforcement to restrict risky third-party app permissions

Don’t let cybercriminals compromise your business. Contact GeorgiaMSP today for a security audit and keep your data protected!


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