WhatsApp Security Vulnerability Alert Issued by Microsoft

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Microsoft Warns of Malware Campaign Targeting 3.3 Billion Messaging App Users

A sophisticated malware campaign has been identified by Microsoft, affecting an estimated 3.3 billion users of a popular messaging application.

The Attack Methodology

The attacks, which began on February 26, 2026, utilize malicious Visual Basic Script (VBS) files sent via messages to install backdoors on victims’ systems.
The attackers rename Windows utilities to blend in with normal system activity, making it difficult for security software to detect the malicious code.

According to a report from Microsoft’s Defender Security Research Team, “the entire attack chain relies on trust – on tools, cloud services, and messaging platforms.” Yagub Rahimov, CEO of Polygraf AI, emphasized that security infrastructures are often conditioned to allow rather than inspect, exacerbating the risk.

The inclusion of this type of malware in the risk spectrum poses a significant threat to all messaging app users.

Mitigation Strategies

Microsoft advises users to exercise caution when interacting with messages from unknown senders.
Users should only click links or open files from people they know and trust.
The company recommends enabling Strict Account Settings, which automatically mute unknown calls, block attachments from unknown users, and prevent them from accessing sensitive information.

In addition to these measures, Microsoft has rolled out security updates to defend against such attacks.

Conclusion

Cybersecurity experts stress that users must remain vigilant against phishing and malware attacks.

Yagub Rahimov, CEO of Polygraf AI, cautioned that users must “verify all links and files, keep apps updated, and avoid accepting any unknown files or calls” to significantly reduce the risk of compromise.

This malware campaign highlights the growing importance of constant cybersecurity vigilance, particularly for both personal and professional information.

Users must stay updated, maintain strong security practices, and remain alert to evolving cyber threats to protect themselves and their organizations from potential harm.