A new email campaign designed to spread the Vidar spyware package uses a novel technique involving Microsoft Compiled HTML help files, according to a blog post released today by Trustwave.
The help files, which use the suffix “CHM,” are packaged in an ISO along with the Vidar payload in what appears to be a Word document. If the attacker successfully hoodwinks the target into extracting the phony document, executing either file triggers the malicious package and compromises the system, Trustwave researcher Diana Lopera wrote in the post.
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