Moblog

Do you really need CAPTCHAs?

Spam bots are so effective today mostly because there's only a handful of different publishing software used (forum, blog, CMS). This is very convenient, because all information required to write and tweak a bot is identical for all installations. All the bot software has to do is query Google for parts of a particular URL (eg. inurl:yabb.pl or inurl:phpbb/posting.php) and continue with algorithms to circumvent the specific protection (if any). Continue reading "Eliminate Form Spam Using Behavioural Analysis and Individual Forms"

Despite several efforts to bring it down (including the takedown of a major hoster, McColo, which hosted the primary server), the Srizbi network, comprising half a million "zombie PCs" and accountable for approximately 40% of all spam traffic, resurrected itself using an interesting technique: Its bots try to reach domains based on some (not yet disclosed) algorithm. Continue reading "Srizbi Botnet Resurrects Itself. Interesting Technique."