It
By Simon Bisson & Mary Branscombe in Editorial
Posted in Identity, Security, Google, Internet on
I find it easy to spot most of the phishing messages that hit my inbox, because there’s nearly always an egregious grammatical mistake in there somewhere. Real messages from banks may be full of logical errors (like a regular savings account with a headline rate of 7% that never tells you that actually it averages out nearer 4% because not all of the money gets to earn the high rate for the whole year), but the spelling is spot on.
And spammers are in such a hurry to put up the Web pages they want to earn ad money on, or use for drive-by downloads to increase the size of the botnet they use to spend most of the spam from zombie machines, that they often make stupid mistakes. If you’re checking 100 messages a day in your junk mail filter for anything real that got in there by mistake, I’m not sure if it’s any comfort to remember that spammers are only human. But Google finds it useful.
According to Matt Cutts of Google at Web 2.0, Web spammers often use templates and tools to build their pages. And fairly often they follow the commented-out instruction to ‘type your hidden text in here’ - but never delete that instruction. The tools they use to fill in forms are simplistic too; the captcha you have to complete to leave a comment here is enough to defeat most of them - but so is a box labelled email address with the instruction not to fill it in. When the bot adds whatever email address it’s abusing, you know you can just delete the comment. Simple maths or the instruction to type in a specific word are beyond bots - at least until Jeff Hawkins perfects Hierarchical Temporal Memory.
If you have a site, you need to think of things that raise the blood pressure of the spammers without doing the same to your users. It’s like being chased by any dumb but dangerous pack animal, says Cutts; you only have to run faster than the slowest person you’re willing to sacrifice. If your system is a little different from the default installation of whatever you use, the default attacks are less likely to work and the spammers may move on to slower prey.
Apart from the obvious advice to patch, patch and patch again, Cutts didn’t say much more - because every time you tell spammers how you’re spotting them, they get a chance to stop doing that. A lot of what Google knows about spam comes from the analysis it does of real Web pages, which lets it work out what things go together. If you know that timepiece and chronometer are synonyms for watch, those strangely-worded Rolex spams are easier to stop. You can see this classification in Google Sets and it’s used in Google Spreadsheets. The equivalent of Excel AutoFill does more than days of the week and months of the year, without you having to add the lists by hand; start with red, yellow and blue and Google Sets will add other colours. Start with lion, tiger, bear and you get other animals.
But you might also get wood, tin and cotton. That’s because Google Sets can’t always tell the difference between the list of animal names and the list of animal toys on the Web sites it looks at. It will learn; like spammers it will learn more quickly if someone tells it what it’s got wrong. But at this point, we get into a race between whether the anti-spam tools can learn faster than the spammers
Rated: 80% (1 votes)
Loading ...Comment by payday loans toronto - February 27, 2010 on 9:37 pm
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