Phishing Threat Actors Still Fond of HTML Attachments
Here’s an Important Thing You Need to Know about HTML Attachments that Might Save You a Lot of Trouble.
In 2022 HTML files are still one of the most prevalent attachments used in phishing scams, indicating that the method continues to be successful against spam detection software and works well on the targets themselves.
HTML documents are received from a web server or local storage by the web browsers and rendered into multimedia web pages. HTML describes the structure of a web page semantically and originally included cues for the appearance of the document.
HTML files are frequently used in phishing emails to lead victims to malicious websites, download files, or even show phishing forms locally within the browser.
Because HTML is not malicious, attachments are often overlooked by email security software, resulting in a successful delivery to targets’ inboxes.
How HTML Avoids Detection
When attachments are present in email messages, they are base64 encoded, enabling secure email gateways and antivirus solutions to check them for malicious URLs, scripts, and others.
To make malicious scripts even more difficult to identify, hackers obfuscate them with tools that are available for free and can accept custom configuration for a unique, and therefore less probable to be spotted, result and thus remain undetected.
To Keep in Mind
Because security solutions fail to identify a malicious attachment, receivers are more likely to open it and have their systems compromised.
It is recommended that you always think of HTML attachments as highly suspicious, even if your email protection software doesn’t issue any alerts.
How Can Heimdal™ Help?
Heimdal Email Security will keep your inboxes clean and lean as it uses an entire array of technologies to detect and block spam, malware, and ransomware threats before they compromise your IT system through malicious emails. The advanced spam and malware filter Heimdal Email Security is also compatible with Heimdal Email Fraud Prevention, a module especially designed to combat the growing threat of Business Email Compromise (BEC) attacks.
With our Email Security module, your business and employees will be spared from:
- The pervasive, evolving threat of phishing.
- Email exploits & botnet attacks.
- Unwanted content.
- The again-growing threat of ransomware.
- The frustration of having to click away through never-ending spam emails.
- Botnet attacks through email.
- Malicious links and attachments.
- Emails coming from infected IPs and/or domains.
- Advanced spam.