Similarly, if you would not like Twitter to auto-convert @mentions or #tags into hyperlinks, add a zero width space after the @ or # symbol respectively. As soon as the victim clicks on the link in the email, however, they are taken to a credential harvesting phishing site mimicking that of Chase Bank.The new attack, which Avanan refers to as Z-WASP, is an evolution of previously observed attempts to bypass Office 365 security either by splitting the URL into base and href tags ( However, the zero-width space is not supported in some web browsers such as old versions of Internet Explorer (versions 6 and earlier). And the following words are not separated with these spaces: Thus, the email processing system would not recognize the URL as legitimate and would fail to apply protections. On the upside, there are a few genuinely useful things you can do with a zero-width space: Stop auto-linking All Rights Reserved.The issue, cloud security firm Avanan says, resided in the use of zero-width spaces (ZWSPs) in the middle of malicious URLs within the RAW HTML of the emails. To show the effect of the zero-width space, the following words have been separated with zero-width spaces: You’re unlikely to be tricked in this way—but it has happened. In HTML pages, the zero-width space can be used as a potential line-break in long words as an alternative to the
The vulnerability apparently rendered all Office 365 users vulnerable to phishing attacks, even those who were using Microsoft’s Office 365 Advanced Threat Protection. If you want to avoid words to be split like this (which would be the normal behaviour), you don't have to modify the templates: you just have to avoid calling them. The first wave of emails abusing this vulnerability was observed on November 10, and Microsoft addressed the issue on January 9, Avanan’s security researchers say. If you would like to prevent Twitter from interpreting two consecutive words as a URL, just add a zero width space after the dot. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself. As part of the observed phishing attacks, “the Zero-Width Non-Joiner () is added to the middle of a malicious URL within the RAW HTML of an email,” Avanan notes. This method breaks the URLs, thus preventing Microsoft’s systems from recognizing them and also preventing Safe Links from successfully protecting users. Zero-Width Space Phishing Attack Demonstration According to the researchers, attackers are simply inserting multiple zero-width spaces within the malicious URL mentioned in their phishing emails, breaking the URL pattern in a way that Microsoft does not recognize it as a link.
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