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Opened 5 years ago

Closed 5 years ago

Last modified 5 years ago

#12407 closed enhancement (fixed)

claim your coupon code here

Reported by: Siemianowice Slaskie Owned by: Dirk Stöcker
Priority: lowest Milestone: plugin - spam-filter
Component: plugin/spamfilter Version: 1.1.2
Severity: normal Keywords: possible does thoughts
Cc: Branch:
Release Notes:
API Changes:
Internal Changes:

Description (last modified by Christian Boos)

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Change History (6)

comment:1 by Christian Boos, 5 years ago

Milestone: next-major-releasesplugin - spam-filter

Why did the SpamFilter let this one through?

comment:2 by Christian Boos, 5 years ago

Description: modified (diff)

Wow, some human bot behind this one, presumably (Hi! Nice try, but think about getting a real job before you grow old).

newticket
no Siemianowice Slaskie	104.144.146.123	11	17 mars 2016 à 14:10:06
Bayesian (-19): SpamBayes à estimé la probabilité de spam à 97.27%
Captcha (17): Human verified via CAPTCHA (Recaptcha)
Mollom (10): Mollom says content is ham
Session (3): Session existante trouvée.
StopForumSpam (0): StopForumSpam affirme qu'il s'agit de spam (ip [0.26])
claim your coupon code here Siemianowice Slaskie None If you're ...
	
/newticket
no Siemianowice Slaskie	104.144.146.123	-9	17 mars 2016 à 14:09:57
Bayesian (-19): SpamBayes à estimé la probabilité de spam à 97.27%
Mollom (10): Mollom says content is ham
StopForumSpam (0): StopForumSpam affirme qu'il s'agit de spam (ip [0.26])
claim your coupon code here Siemianowice Slaskie None If you're ...

Mollow isn't very efficient here. StopForumSpam says it's spam, but despite having StopForumSpamFilterStrategy set to 4, we don't have negative karma for that filter.

SpamBayes is mostly categoric about the spam nature of the post, maybe the session + CAPTCHA shouldn't be enough to overcome that.

What about decreasing Mollom to 5, increase Bayesian filter to 22?

I hesitate to reduce the Captcha, but maybe if we find a way to repeat the captcha in a way that positive karma could accumulate over retries? That won't be dissuasive for the most tenacious spammers, but if it takes them more time than it's worth for them, they would give up…

Bottom-line: it would be great if we could find a way so that filling the captcha wouldn't be a bypass to post what is very clearly spam to the Bayesian filter (> 95%).

in reply to:  2 comment:3 by Jun Omae, 5 years ago

What about decreasing Mollom to 5

+1

comment:4 by Ryan J Ollos, 5 years ago

Component: generalplugin/spamfilter
Owner: set to Dirk Stöcker

comment:5 by Dirk Stöcker, 5 years ago

Resolution: fixed
Status: newclosed

I already defaulted to Mollom 5 in my installation some time ago. I now changed also the code.

Nevertheless your assumption is wrong that somebody did this by hand. They simply use a captcha solver service like 9kw.eu or captchabrotherhood. As automated captcha solving is expensive I don't think that is a major problem.

StopForumSpam gets 0, as the spaminess is not high enough yet (0.26).

If you change these values with a simple guess than the result will very likely worse performance. I did not choose them random, but they are based on the statistics information gathered at the JOSM website over longer time and I adapt them from time to time when situation changes. E.g. Overweighting Bayes will make user contributions impossible in some cases.

Negative Captcha tries already decrease captcha karma which reduces effect of auto-tries.

As already written on the wiki page - you simply need to accept false positives. Performance of the filter is very good ATM with proper training - there are seldom slip throughs, mainly for auto-captcha solvers. I'd be happy when I'd reach that performance with my mail filters.

comment:6 by Ryan J Ollos, 5 years ago

Associated changeset is [14652].

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