Vishing Attacks Target Microsoft 365 Users with Entra

In today's digital landscape, cybersecurity threats are evolving, and one of the latest tactics involves voice phishing, also known as vishing. Recently, threat actors have been targeting Microsoft 365 users with fake security requests, prompting them to enroll in new Entra passkeys.

Understanding the Attack

Since April, these attackers have been running a campaign aimed at deceiving users across various sectors. They exploit a new feature introduced by Microsoft in May, which allows administrators to conduct 'passkey registration campaigns.' Unfortunately, this capability has been manipulated by malicious actors to lure unsuspecting individuals into enrolling passkeys under their control.

How the Vishing Campaign Works

The campaign operates by contacting users directly via phone. The attackers pose as representatives from Microsoft, stating that users must enroll in a new Entra passkey for enhanced security. To further their deception, they direct victims to phishing sites designed to look like the legitimate Microsoft passkey enrollment process.

The Phishing Kit in Action

These malicious websites are particularly convincing, featuring the branding of the victim's organization and mimicking the actual enrollment portal. Rather than using traditional proxy methods, this phishing kit is managed through a PHP panel that allows attackers to guide victims in real-time through various stages of authentication.

Who is Behind the Attacks?

According to cloud-based identity and access management company Okta, the group responsible for this campaign is identified as O-UNC-066. This group is known for operating an extortion scheme called Pink and has targeted users in several industries, including food and beverage, technology, healthcare, automotive, construction, and aviation.

Recognizing Phishing Attempts

It's crucial for users to remain vigilant and recognize potential phishing attempts. Here are some signs to watch for:

Unsolicited phone calls requesting personal information.
Websites that closely mimic official portals but have slight discrepancies.
Urgent requests for enrollment in security features without prior notice from your organization.
Links containing unusual domain names or misspellings.

How to Protect Yourself

To safeguard against these vishing attacks and phishing schemes, consider implementing the following strategies:

Always verify the identity of callers before sharing any information.
Access sensitive portals directly through official websites instead of clicking links from unsolicited messages.
Educate your team on identifying phishing attempts and suspicious behavior.
Utilize multi-factor authentication (MFA) for an added layer of security.

Technology teams are watching vishing attacks target microsoft 365 users with entra passkeys closely because changes in this space often arrive faster than internal policies can adapt.

For product and engineering leaders, the practical question is how this could reshape roadmaps, vendor choices, and security reviews over the next few quarters.

Organizations that document lessons early tend to respond more calmly when similar patterns appear again.

In many companies, the first impact shows up in planning meetings: teams reassess priorities, revisit risk registers, and check whether existing tooling still fits.

Smaller businesses feel these shifts too. A single platform change or market move can affect customer trust, delivery timelines, and hiring plans.

The most resilient teams treat stories like this as input for quarterly reviews rather than one-day headlines.

If your business depends on modern software, ERP, VoIP, or customer-facing apps, staying informed helps you separate noise from decisions that require action.

Looking ahead, disciplined follow-through matters: assign owners, set review dates, and measure whether your response improved outcomes.

Security and compliance stakeholders should ask whether current controls still match the pace of change described in this update.

Operations leaders can reduce friction by translating the headline into a short internal brief with clear next steps for each department.

Customer support teams may see early signals through tickets, outages, or policy questions long before leadership reviews are scheduled.

Finance and procurement groups should note whether licensing, vendor risk, or implementation costs need revisiting after this development.

Training programs benefit from timely updates so staff understand what changed, what did not change, and what requires escalation.

Architecture reviews are a practical place to test assumptions, especially when new tools, platforms, or threats enter the conversation.

Documentation quality often determines how quickly a company recovers from surprises; capture decisions while context is still clear.