![]() ![]() However, if the user enters their password, they receive a fake note that the submitted password is incorrect. The dialog box prompts the user to re-enter their password, because their access to the Excel document has supposedly timed out. If the target user’s organization’s logo is available, the dialog box will display it. Sample credentials dialog box with a blurred Excel image in the background. Notably, the dialog box may display information about its targets, such as their email address and, in some instances, their company logo. When the attachment is opened, it launches a browser window and displays a fake Microsoft Office 365 credentials dialog box on top of a blurred Excel document. ![]() Using xls in the attachment file name is meant to prompt users to expect an Excel file. Sample phishing email message with the HTML attachment The email attachment is an HTML file, but the file extension is modified to any or variations of the following:įigure 1. In some of the emails, attackers use accented characters in the subject line. The XLS.HTML phishing campaign uses social engineering to craft emails mimicking regular financial-related business transactions, specifically sending what seems to be vendor payment advice. XLS.HTML phishing campaign: Fake payment notices are effective tool for attackers to steal credentials Microsoft 365 Defender does this by correlating threat data from email, endpoints, identities, and cloud apps to provide cross-domain defense. Rich email threat data from Defender for Office 365 informs Microsoft 365 Defender, which provides coordinated defense against follow-on attacks that use credentials stolen through phishing. ![]() To defend organizations against this campaign and similar threats, Microsoft Defender for Office 365 uses multiple layers of dynamic protection technologies backed by security expert monitoring of email campaigns. Multilayer obfuscation in HTML can likewise evade browser security solutions. In the case of this phishing campaign, these attempts include using multilayer obfuscation and encryption mechanisms for known existing file types, such as JavaScript. Such details enhance a campaign’s social engineering lure and suggest that a prior reconnaissance of a target recipient occurs.Įmail-based attacks continue to make novel attempts to bypass email security solutions. As we previously noted, the campaign components include information about the targets, such as their email address and company logo. This campaign’s primary goal is to harvest usernames, passwords, and-in its more recent iteration-other information like IP address and location, which attackers use as the initial entry point for later infiltration attempts. Only when these segments are put together and properly decoded does the malicious intent show. In effect, the attachment is comparable to a jigsaw puzzle: on their own, the individual segments of the HMTL file may appear harmless at the code level and may thus slip past conventional security solutions. Instead, they reside in various open directories and are called by encoded scripts. Some of these code segments are not even present in the attachment itself. These attackers moved from using plaintext HTML code to employing multiple encoding techniques, including old and unusual encryption methods like Morse code, to hide these attack segments. The HTML attachment is divided into several segments, including the JavaScript files used to steal passwords, which are then encoded using various mechanisms. This phishing campaign exemplifies the modern email threat: sophisticated, evasive, and relentlessly evolving. During our year-long investigation of a targeted, invoice-themed XLS.HTML phishing campaign, attackers changed obfuscation and encryption mechanisms every 37 days on average, demonstrating high motivation and skill to constantly evade detection and keep the credential theft operation running. ![]() Endpoint management Endpoint managementĬybercriminals attempt to change tactics as fast as security and protection technologies do.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 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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