Threat actors are sending out a wave of phishing emails disguised as missed voicemail notifications in an attempt to bypass both email scanners and user suspicions.
The attack is sent in the form of an email purporting to be a notification about a voice message using subject lines such as “PBX Message,” “Voice:Message” or “Voice Delivery Report” along with an .EML attachment, according to a Jan. 24 Tripwrie blog post.
EdgeWave researchers who also examined the malicious campaign suggested that users may not be familiar with the notion that emails can be sent as an .EML attachment and then opened by email clients. As a result companies may not have taken the same measures to block malicious .EML attachments as they have for other types of malicious attachments.
If a users were to click the .EML file it would be opened by their email clients and display a message posing as a Ring Central, a cloud-based business phone platform, displaying bogus call log information about the alleged missed voicemail.
Upon clicking any of the links to “Preview,” “Listen,” or “Save audio” users are taken to a bogus Microsoft account login page instructing users to enter their credentials twice to ensure the attacker gets the correct password.
Once entered users are taken to a separate webpage where they are given a random voicemail that can easily be ignored. Researchers recommend users always be wary of unsolicited email attachments.