Anti-spam firm MXSweep has reported that MP3-based pump-and-dump spam now accounts for up to 10 per cent of all spam sent. The penny stocks are being promoted with MP3 voice messages with deceptive sounding names like 'santana.mp3', 'bspears.mp3' or 'coolringtone.mp3'. The messages are much larger than image spam and PDF spam, and can reach 147KB.
For the most part the message contents are empty with subject headers containing just 'Fwd:' or 'Re:' or the name of the file attachment. File names have been categorised as 'emotional' (dadsong.mp3, oursong.mp3, weddingsong.mp3), well-known artists and songs (santana.mp3, sayyousayme.mp3, smashingpumpkins.mp3), or 'sounds' that people might want to listen to (answeringmachine.mp3, coolringtone.mp3, listentothis.mp3).
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