Hackers exploit printers to attack Windows systems via Microsoft 365
2025-06-30 00:00- A new cyber attack campaign is exploiting printers to hack Windows systems through Microsoft 365.
- The Varonis investigation found that the threat actors use a feature called Direct Send to bypass security measures.
- Organizations are urged to implement strict security protocols to mitigate these attacks.
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Insights
In the United States, a new cyber attack campaign has emerged, targeting Windows users by leveraging printers connected to Microsoft 365. This operation, reported by Varonis Managed Data Detection and Response Forensics, began around May 2025 and has already affected at least 70 organizations. The attackers exploit a little-known feature known as Direct Send, which allows devices like printers to send emails without requiring any authentication, thus bypassing usual security checks. With threat actors utilizing this feature effectively, they have been able to spoof internal users and send phishing emails that are less scrutinized compared to regular emails. Tom Barnea, a forensics specialist at Varonis, indicated that this tactic poses significant risks, particularly because it allows attackers to deliver malicious messages without needing to compromise email accounts directly. The campaign demonstrates the broadening scope of threats as attackers continuously seek new ways to target organizations and individuals. In light of these events, it has become increasingly crucial for organizations to take proactive measures to safeguard their systems. Recommendations from Varonis to combat these attacks include enabling the
Contexts
Cybersecurity has become a critical concern for organizations of all sizes as the frequency and sophistication of cyber threats increase. To enhance the cybersecurity posture of an organization, it is imperative to implement a layered approach to security that encompasses people, processes, and technology. A strong foundation in employee training is essential, as human error is often the weakest link in the security chain. Regular training sessions that raise awareness of phishing attacks, social engineering, and safe internet practices can significantly reduce the likelihood of security breaches. Furthermore, integrating a culture of cybersecurity awareness into the organizational ethos encourages employees to be vigilant and proactive in identifying and reporting potential threats. In addition to employee training, organizations must establish robust policies and procedures that dictate how to handle sensitive information and respond to security incidents. Implementing a comprehensive cybersecurity policy that includes guidelines for data handling, access controls, and incident response is critical. For example, restricting access to sensitive data on a need-to-know basis can drastically minimize the risk of data breaches. Companies should also regularly review and update their policies to reflect the evolving threat landscape and ensure compliance with applicable regulations. The technical aspects of cybersecurity must not be overlooked, as they form the backbone of an organization's defense against cyber threats. This includes investing in advanced security technologies such as firewalls, intrusion detection and prevention systems, and encryption solutions. Regular software updates and patch management are crucial to safeguard against vulnerabilities that can be exploited by cybercriminals. Implementing multi-factor authentication (MFA) adds an additional layer of security, making it significantly more difficult for unauthorized users to gain access to systems and sensitive information. Finally, continuous monitoring and assessment of an organization's cybersecurity posture are vital. Conducting regular security audits and vulnerability assessments can help identify weaknesses and potential attack vectors. Incorporating threat intelligence can also aid in staying ahead of emerging trends in cyber threats. Adopting a zero-trust security model, which assumes that threats could be inside and outside the network, further enhances security by ensuring that every access request is thoroughly vetted. By combining education, policy enforcement, technology deployment, and ongoing assessment, organizations can create a robust cybersecurity framework that effectively mitigates risks and protects crucial assets.
