Microsoft takes down domains used to scam Office 365 users

Microsoft’s Digital Crimes Unit (DCU) has seized 17 malicious domains used by scammers in a business email compromise (BEC) campaign targeting the company’s customers.

The domains taken down by Microsoft were so-called “homoglyph” domains registered to resemble those of legitimate business. This technique allowed the threat actors to impersonate companies when communicating with their clients.

According to the complaint filed by Microsoft last week (more details available in the court order), they used the domains registered via NameSilo LLC and KS Domains Ltd./Key-Systems GmbH as malicious infrastructure in BEC attacks against Office 365 customers and services.

Defendants use malicious homoglyph domains together with stolen customer credentials to unlawfully access customer accounts, monitor customer email traffic, gather intelligence on pending financial transactions, and criminally impersonate O365 customers, all in an attempt to deceive their victims into transferring funds to the cybercriminals, Microsoft said.

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