An urgent alert has been issued for the world’s most popular messaging app, WhatsApp, targeting its estimated 3.3 billion active users. Microsoft recently warned that a malware campaign is exploiting WhatsApp to install backdoors on users’ systems. The attacks reportedly began on February 26, 2026, and involve malicious Visual Basic Script (VBS) files sent via WhatsApp messages.
The Microsoft Defender Security Research Team detailed in a report that the campaign follows a multi-stage attack chain that preys on user trust. “It uses renamed Windows utilities to blend into normal system activity, downloads payloads from trusted cloud services such as AWS, Tencent Cloud, and Backblaze B2, and installs malicious Microsoft Installer packages to maintain system control,” the report cautioned.
Experts note that these attacks initially appear as phishing attempts, where VBS files enable data theft and persistent remote access. Such attacks pose a continuous threat to all messaging app users, with WhatsApp included in the risk spectrum.
Yagub Rahimov, CEO of Polygraf AI, explained, “The entire attack chain relies on trust—on tools, cloud services, and messaging platforms. Security infrastructures are often conditioned to allow rather than inspect. WhatsApp worsens the risk because employees frequently use personal messaging apps on work devices. Most security stacks have yet to catch up with this threat.”
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Consumer Safety Recommendations
A WhatsApp spokesperson advised, “On any messaging service, only click links or open files from people you know and trust. WhatsApp provides additional information when someone messages you for the first time—such as whether the person is in your contacts, where their phone number comes from, and any mutual groups.”
The spokesperson added that WhatsApp has recently rolled out security updates to defend against such attacks. Users in high-risk professions, including political figures, celebrities, or other sensitive roles, can now activate Strict Account Settings, which automatically mute unknown calls, block attachments from unknown users, and prevent link previews.
Cybersecurity experts emphasize that users must remain vigilant against phishing and malware attacks. They advise not clicking on any link or attachment without verification. This precaution is equally critical for personal and work devices.
Microsoft’s Warning
Microsoft’s report confirmed that these WhatsApp attacks could compromise a user’s Windows environment, giving cybercriminals persistent remote access to sensitive data. Experts warn that as threat actors refine these attack methods, targeted attacks could spread from high-value individuals to the general user base.
Users are advised to verify all links and files, keep apps updated, and avoid accepting any unknown files or calls. Following these precautions can significantly reduce the risk of compromise.
The WhatsApp malware campaign highlights the growing importance of constant cybersecurity vigilance. For both personal and professional information, users must stay updated, maintain strong security practices, and remain alert to evolving cyber threats.
About the author – Ayesha Aayat is a law student and contributor covering cybercrime, online frauds, and digital safety concerns. Her writing aims to raise awareness about evolving cyber threats and legal responses.
