Security News > 2021 > November > Microsoft warns of surge in HTML smuggling phishing attacks
Microsoft has seen a surge in malware campaigns using HTML smuggling to distribute banking malware and remote access trojans.
While HTML smuggling is not a new technique, Microsoft is seeing it increasingly used by threat actors to evade detection, including the Nobelium hacking group behind the SolarWinds attacks.
HTML smuggling is a technique used in phishing campaigns that use HTML5 and JavaScript to hide malicious payloads in encoded strings in an HTML attachment or webpage.
A phishing HTML attachment could include a harmless link to a known website, thus not being seen as malicious.
The attacks usually start with a phishing email containing an HTML link in the body of the message or a malicious HTML file as an attachment.
If either is clicked, a ZIP file is dropped using HTML smuggling.
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