Fake MJ12bot/v1.0.8

User-Agentとして，

MJ12bot/v1.0.8 (http://majestic12.co.uk/bot.php?+)

を騙る相手からDoS攻撃かと思えるような大量のアクセスをくらった． これまで，MJ12botはきちんとrobots.txtを読んで帰っていた¹し，アクセス元のIPアドレスもおかしい²ので調べてみたら，"Majestic-12 : DSearch : MJ12bot“に，

Fake MJ12bot v1.0.8
20 Oct 2007 - in the last few days it has been brought to our attention that a number of fake MJ12bots appeared on the Net. These bots are not ours but they use fake MJ12bot user-agent - this is something we can’t do anything about just like with email spammers who fake email addresses so we all get spammed supposedly from our own emails or someone elses. :(
(snip)
28 Dec 2007 - we continue to get reports from people about fake bot. It has now became certain that this bot is actually a virus of some kind that installs itself on end user computers and turns them into botnet - currently anti-virus vendors do not appear to catch this malware, however we are working very hard trying to collect data that will help develop a cure against this virus. Yet again we stress that we have nothing whatsoever to do with those people - our software is not used, they just use fake user-agent that we started using more than 3 years ago.

という説明があった．どうも，User-Agentとして"MJ12bot/v1.0.8"を騙るbotが存在するらしい．とりあえず，.htaccessでも拒否しておくことにする…