A new malware attack is leveraging a classic phishing technique in an innovative way. Traditionally, phishing emails attempt to mimic official communications from legitimate companies, tricking users into divulging personal information, such as login credentials. This new malware, however, takes a different approach by using a small, targeted campaign that sends a compressed zip file disguised as an invoice.

Many email security programs and antivirus tools struggle to detect compressed content like this, allowing the malicious file to slip through and land in employees' inboxes. Once the zip file is opened, Windows Explorer searches for an item named "Invoice," but the malware renames the item to "Downloads" and opens it. At this point, users see a list of files resembling their downloads folder. Executing any of these files installs more malware, escalating the potential damage.

Because the campaign was brief, cybersecurity researchers were unable to fully identify the payload or the specific types of malware involved. However, despite limited details on this particular attack, there are several steps you can take to protect your business from this and other similar threats.

Here are three key takeaways to help safeguard your business:

1. Run the Latest Operating System

Operating systems like Windows XP, Vista, and even Windows 7 are outdated and no longer receive security updates, making them highly vulnerable to attacks. Windows 10, although still widely used, will also stop receiving support from Microsoft in October 2025. Running an old OS version puts your systems at significant risk of malware infections and other cybersecurity threats.

It's crucial to regularly update your operating system to ensure it has the latest patches and security features. Microsoft, Apple, and Google frequently release updates to address new vulnerabilities, and having a process in place to quickly deploy and verify these updates can significantly reduce the risk of attacks.

2. Run & Monitor Security Software

Using Endpoint Detection & Response (EDR) software offers a robust layer of defense beyond traditional antivirus tools like Windows Defender. While antivirus programs focus on preventing malicious software from being downloaded, EDR goes further by analyzing threat signals from across your network, detecting suspicious behaviors that might otherwise evade standard anti-malware solutions. Implementing and consistently monitoring EDR can help stop malware before it causes significant harm.

3. Cyber Awareness Training

No security system is foolproof, and even the best defenses can occasionally fail. This makes your employees the last line of defense against malware attacks. Employees who are educated about potential threats are more likely to notice unusual activities that automated systems might miss.

Conduct regular cybersecurity awareness training that focuses on emerging threats and best practices. These short, frequent sessions will help keep your team informed and vigilant, reducing the chances of them falling victim to phishing or malware attacks.

Conclusion

While the specifics of this new Windows Search malware remain unclear, businesses can take proactive steps to minimize their exposure to such threats. By keeping operating systems up-to-date, utilizing advanced security software like EDR, and maintaining a strong cybersecurity awareness program, small businesses can protect themselves from future attacks. Stay vigilant, and ensure that your systems and employees are equipped to handle evolving cybersecurity challenges.