Why file formats matter in email security

NEW: The increasing use of "Scalable Vector Graphics" files by threat actors in cybercrime marks a concerning evolution in #phishing and #malware delivery tactics. Unlike raster image formats like JPG and PNG, which are composed of fixed grids of pixels, SVG files are based on XML text. This means SVG files store image data as mathematical instructions, allowing them to scale infinitely without loss of quality. This text-based nature makes SVG files versatile and lightweight but also exposes them to exploitation by the bad guys. Malicious actors embed phishing forms or JavaScript payloads directly into SVG files, enabling them to bypass traditional security measures that focus on binary-based malware or static image content. One key reason SVG files evade detection is their ability to seamlessly integrate malicious scripts or phishing content while appearing innocuous to end users and even some security tools. For example, a phishing form can be embedded entirely within an SVG attachment in an email, presenting a highly realistic fake login page to unsuspecting victims. Since many email filters and antivirus systems focus on identifying malicious executables or traditional phishing links, they may not scrutinize SVG attachments as closely. Of note: browsers and email clients widely support SVG files, making them an ideal vector for attackers. https://lnkd.in/gCABXJbX #auguryit #cybersec #emailsecurity

In the latest evolution of phishing tactics, attackers are taking a low-tech approach that’s proving remarkably effective. By disguising CAB files as harmless GZ archives, threat actors are slipping malware past defenses, triggering native Windows execution, and achieving inbox delivery with high success rates. It’s not a zero-day. It’s not a new malware strain. But it works—because it abuses trust in file formats, user expectations, and overlooked gaps in email analysis. In just 48 hours, this technique showed up in 217 emails across 86 companies. And based on what we’re seeing in the wild, it’s likely just the beginning. https://lnkd.in/gHcyiM5C

Your ‘meeting reminder’ just stole your password and it came as a picture file. "When an image isn’t just an image… 🎯" SVG files: the clean, scalable graphics we use for sleek websites, have quietly stepped into the dark side. Researchers at Seqrite Labs, Soumen Burma and Rumana Siddiqui, recently uncovered a crafty phishing technique where .SVG files hide embedded JavaScript. The moment such a file is opened in a browser, it can silently redirect the user to a pixel-perfect phishing page designed to steal credentials. Why this is raising eyebrows across the security community: > Often slips past email filters and cloud storage checks. > Opens in browsers by default, triggering malicious code instantly. > SVG files can evade security checks by appearing harmless. > JavaScript in SVGs enables hidden payloads and phishing redirects. > CAPTCHAs add credibility and bypass automated detection. > Using trusted clouds (Dropbox, OneDrive) increases click rates. Paired with convincing lures, fake “Meeting Reminder” invites, near-perfect Microsoft 365 login forms. It’s a reminder that in cybersecurity, even the most innocent-looking file format can be a fully weaponised delivery vehicle. Detection needs to go beyond surface-level checks, and awareness must include these less obvious attack paths. The full blog also shares IOCs and practical tips to help identify and defend against this kind of emerging threat. Kudos to Soumen Burma and Rumana Siddiqui for their deep-dive research that’s getting global traction. 📌 Link to the full blog is in the 1ST comment, worth a read if you want to see the attack chain in detail. #CyberSecurity #ThreatIntel #Phishing #MalwareAnalysis #IncidentResponse #SVG #SeqriteLabs #CyberAwareness #SVGPhishing #ThreatIOCs Seqrite Quick Heal

Title: 🚨 Beware: Phishing Emails Now Using SVG Attachments to Evade Detection Body: Cybersecurity experts have identified a new phishing tactic where attackers use SVG (Scalable Vector Graphics) attachments to bypass traditional email security filters. Unlike standard image files, SVGs can embed scripts, allowing malicious actors to redirect users to harmful websites or download malware upon opening. Why is this important? Traditional security systems may not flag SVG files, increasing the risk of data breaches and financial loss. What should you do? Be cautious with unexpected email attachments, especially SVG files. Ensure your security software is updated and scans all file types. Educate your team about this emerging threat. Stay vigilant and protect your digital assets. #Cybersecurity #Phishing #EmailSecurity