Source of Article: Various tech blogs
Several tech blogs are reporting that the old Windows help-file (.chm) format is being used to deliver CryptoWall attacks in which data on the attacked PC is encrypted and held for ransom.
Sadly quite a few legitimate software packages still use this outdated format which was largely abandoned by Microsoft (though not completely) due to its many security vulnerabilities.
If you get an email with an attachment with the chm extension I would recommend that you not open it.
W.C.
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