Major nuisance
This is the source of the major spike "FedEx Invoice" spam over the last two weeks.
Relatively primitive, but as it is using "legitimate" servers it is not covered by most blacklists and has a fairly high rate of getting through.
A revamped version of the Torte botnet malware is turning insecure CMS servers into spam-spewing zombies. SpamTorte 2.0 is a powerful, multi-layered Spambot that is capable of running large-scale spam campaigns while cleverly masking itself to avoid detection, security firm Verint warns. The SpamTorte botnet relies on …
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Most of the backers are protected by hostile sovereignty, meaning they're impossible to apprehend. Some campaigns are even state-run-in-disguise: acts of covert cyberwarfare complete with plausible deniability. Again, good luck getting the perpetrators to stop because in that case they ARE the State and sovereign by definition.