Festi botnet spam made KOCNET beat TTNET to #1 in Turkey for the first time ever in August 2012 SpamRankings.net, in rankings from both CBL and PSBL data. While TTNET managed to stop most spam from Festi botnet, Festi spam from KOCNET massively ramped up.
Graph by John S. Quarterman for SpamRankings.net.
Both ISPs hit a Festi low on 21 July, which raises the speculation that that low had nothing to do with infosec efforts by the ISPs, and more to do with something going on inside Festi. After that low, TTNET briefly started back up with Festi, but then dropped down. KOCNET just kept going up. Up so far that KOCNET made #3 in the world in rankings from CBL data and #4 in the world in rankings from PSBL data, pushing Turkey itself up to #4 (CBL) and #5 (PSBL).
TTNET had already pushed Turkey last month to #4 (CBL) and #6 (PSBL). It was Festi then, and it's Festi now, but the lead Turkish ISP has changed: last month it was TTNET, this month it's KOCNET. It's a problem when a botnet parasite can just move on to a new host like that. Do TTNET and KOCNET even know this is happening?