However, JavaScript is used to render business-related and other legitimate web pages. For example, disabling JavaScript could mitigate HTML smuggling created using JavaScript Blobs. Threats that use HTML smuggling bank on the legitimate uses of HTML and JavaScript in daily business operations in their attempt to stay hidden and relevant, as well as challenge organizations’ conventional mitigation procedures. Because the malicious files are created only after the HTML file is loaded on the endpoint through the browser, what some protection solutions only see at the onset are benign HTML and JavaScript traffic, which can also be obfuscated to further hide their true purpose. This technique is highly evasive because it could bypass standard perimeter security controls, such as web proxies and email gateways, that often only check for suspicious attachments (for example, EXE, ZIP, or DOCX) or traffic based on signatures and patterns. Thus, instead of having a malicious executable pass directly through a network, the attacker builds the malware locally behind a firewall. When a target user opens the HTML in their web browser, the browser decodes the malicious script, which, in turn, assembles the payload on the host device. More recently, we have also seen this technique deliver the banking Trojan Mekotio, as well as AsyncRAT/NJRAT and Trickbot, malware that attackers utilize to gain control of affected devices and deliver ransomware payloads and other threats.Īs the name suggests, HTML smuggling lets an attacker “smuggle” an encoded malicious script within a specially crafted HTML attachment or web page. Notably, this technique was observed in a spear-phishing campaign from the threat actor NOBELIUM in May. HTML smuggling, a highly evasive malware delivery technique that leverages legitimate HTML5 and JavaScript features, is increasingly used in email campaigns that deploy banking malware, remote access Trojans (RATs), and other payloads related to targeted attacks. Microsoft Purview Data Lifecycle Management.Microsoft Purview Information Protection.Information protection Information protection.Microsoft Priva Subject Rights Requests.Microsoft Purview Communication Compliance.Microsoft Purview Insider Risk Management.Risk management & privacy Risk management & privacy.Microsoft Intune Endpoint Privilege Management.Endpoint security & management Endpoint security & management.Microsoft Defender External Attack Surface Management.Microsoft Defender Cloud Security Posture Mgmt.Microsoft Defender Vulnerability Management.Azure Active Directory part of Microsoft Entra.
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