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Using L&K Files to Distribute Malicious Emails
In the past year, threat actors have diversified the types of files they're using in emails beyond even L&Ks. Attackers likely started using HTML smuggling in response to many detection tools not really having been instrumented to identify encoded malicious content within HTML files. Another common class of file we've seen them using as attachments are sort of different sorts of disk images, such as ISOs and IMG files.