Have you ever clicked on an email attachment, only to realize too late that it was a scam? Cybercriminals are now using ZIP file phishing scams to trick users into downloading malware or entering sensitive information.
This new phishing attack exploits fake file openers within your browser, making it appear as though you’re opening a legitimate file. Instead, you could be handing over your credentials to hackers.
What Is a ZIP File Phishing Scam?
Cybercriminals are leveraging .ZIP file extensions and fake file openers to create convincing phishing attacks. Here’s how it works:
- You receive a phishing email—usually disguised as an invoice, receipt, or official document.
- The email contains a malicious file—claiming to be a ZIP file download.
- Clicking the link opens a fake file viewer—instead of downloading a file, your browser displays a fake WinRAR or Windows Explorer window.
- You are prompted to enter login credentials or download malware—unknowingly giving hackers access to your system.
Why Is This Effective? Many users are familiar with ZIP files and assume they are legitimate, making them more likely to fall for the scam.
Signs of a ZIP File Phishing Scam
- Suspicious Email Senders – If an email claims to contain a ZIP file, verify the sender’s address.
- Misspelled URLs – Look out for slight variations in domain names (e.g., micr0soft.com instead of microsoft.com).
- Unexpected ZIP File Requests – If you weren’t expecting a ZIP attachment, don’t open it.
- Fake File Openers – If a ZIP file opens in your browser instead of downloading, it’s likely a scam.
- Urgent or Threatening Language – Phishing emails often create urgency to trick you into acting quickly.
How to Protect Yourself from Fake File Opener Phishing
- Be Wary of Links: Don’t click on links in emails or messages unless you’re absolutely certain of the sender and their intended destination. Hover over the link to see the actual website address before clicking.
- Check Website URLs Scrutinize: Look closely at the website address (URL) displayed in your browser bar. Phishing sites often use slightly misspelled addresses that appear legitimate at first glance.
- Utilize a Password Manager: Password managers help create strong, unique passwords for all your accounts. This way, even if you fall victim to a phishing attempt, your other accounts remain secure.
- Enable Pop-Up Blockers: Pop-up blockers can help prevent malicious websites from automatically launching fake file openers or other phishing tactics.
- Stay Informed on Cyber Threats: Phishing techniques are constantly evolving. Stay updated on the latest threats by following reputable cybersecurity blogs or news sources.
By following these simple steps, you can significantly reduce your risk of falling victim to this new phishing technique and keep your data safe.
Security Measures for Businesses:
- Block .ZIP Attachments in Exchange Admin Center: Create a rule within the Exchange admin center to block emails containing attachments with the .ZIP extension.
- Implement Email Filtering: If your email service offers attachment blocking, configure it to block incoming emails containing attachments or links associated with .ZIP domains.
- Deploy Web Filtering: For enhanced protection, deploy robust web filters to restrict user access to websites with .ZIP domains.
By combining user awareness with proper technical safeguards, organizations can significantly mitigate the risks associated with this new phishing tactic.
Additional Technical Details (For IT Professionals):
- Exploiting .ZIP Domains: Attackers leverage .ZIP domains to enhance their social engineering campaigns. When users encounter a link disguised as a .ZIP file, it raises less suspicion compared to a standard phishing URL.
- Windows File Handling Behavior: Windows attempts to open files with a .ZIP extension even if the file doesn’t contain an actual archive. This behavior can be exploited by malicious websites to trick users.
IT Security Tip: Implement Zero Trust Policies and train employees to spot phishing threats.
Protect Your Business from Cyber Attacks
This fake file opener phishing thing? It’s just the latest example of how tricky cyber criminals are getting. They’re always coming up with new ways to try and catch us out. So, while being careful online is important, you really need to have some solid security in place.
Not sure if your business is secure? Let CyberProtect assess your cybersecurity defenses. We can help you figure out how to best protect your business from these kinds of attacks.