see:
https://www.hackerfactor.com/blog/index.php?/archives/678-Bo...
https://www.hackerfactor.com/blog/index.php?/archives/762-At...
https://www.hackerfactor.com/blog/index.php?/archives/775-Sc...
https://www.hackerfactor.com/blog/index.php?/archives/777-St...
https://www.hackerfactor.com/blog/index.php?/archives/779-Be...
I've done lots of portscanning of the entire internet, this always generates vast amounts of abuse emails. Many of these these emails are xenophobic rants from obviously distressed people staring at their access.logs, thinking they're being targeted by the Russian government or something.
I can't help but wonder if this might be a similar case.