Search Results for 'spam'
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Search Results
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@foxly-
This is a very nice summary of the problem. Thank you for providing the introduction to the various attack vectors spammers currently use.
I would argue, as you know, that WP / BP also needs to combat registration spam–even though it is the hardest issue to address. There area a number of BP.org members that are looking for a solution, however imperfect, that will noticeably reduce spam signups. If a person is infected with a small viral load, the resulting illness often will not be as severe as if they had received a large dose of invading organisms. The same can be said with website spam signups. Any reduction is better than none.
But, as this is your thread and I do not want to take your thread off topic (or have others do what I just did
), I will ask that we table that discussion for another thread at another time and focus in this thread on solutions to combating spam once a spam account has successfully registered.Once again, this is a great start to the conversation.
All About BuddyPress Spam
From what I’ve seen over the past few days, the range of knowledge about spam in the BP community ranges from zero to PhD research project. So, to get this thread off to a productive start, I’m going to give everyone some background info on why spammers target our installations, how they do it, and what we can do to reduce or eliminate these kinds of attacks.
1) Why do spammers attack BP communities?
-> Spam is 100% economically motivated. Spammers do what they do because it’s very profitable. Even if only 1 out of a million messages the spammer sends actually reaches somebody, if it cost $2 to send out those million messages and the spammer makes $50 by tricking one person into giving them a credit card number, the spammer is going to throw every resource they have into sending out more messages …because they’re getting a 2500% return on their investment.
-> Given the choice between multiple sites, a spammer will pick the one that gives the largest payout.
Gmail is a “hard” target, with users that are experienced with spam. If a spammer sent a billion spam messages to accounts on Gmail, 99.9% of them would be probably be deleted by automated filters at other ISP’s along the way before even arriving at Gmail. The first thousand messages that arrived at gmail would likely be delivered but would be put in user’s spam folders; and the remaining 999,000 messages would be flat-out refused by Gmail’s servers.
Because anyone with an email account is familiar with spam, probably 999 of those 1000 users would ignore the spam message and 1 user might act on it. So if it cost $20 to send those billion messages and the spammer made $50 by tricking the one person into giving them a credit card number, they’ve only made $30 for all that work.
BP communities are usually “soft” targets that are inexperienced with spam.
Once a spammer gets into a BP community, every single message they send is delivered to a member, and most members are NOT expecting to be attacked by other users on the site.
If a user called “site_news” sends everyone a message that says: “Our site just got featured on Oprah! check out the video! http://www.youtube.com/watch/dQw4w9WgXcQ.cn” every single member is going to get that message, and probably half of them are going to click on the link. (did anyone notice what’s wrong with that “YouTube video” …
)Then, assuming there are 50,000 members on the BP site, half of them click on the link, half of those people are using Internet Explorer, and the attack site the link points to installs a backdoor on computers running IE …at $2 / install the spammer has just made $25,000!
Now, if *you* were a spammer, which site would you attack?
2) How do spammers find BP communities?
Using Google.
Example: http://www.google.ca/search?hl=en&q=%2B”is+proudly+powered+by+WordPress+and+BuddyPress” (front page of every BP site on the net)
Example: http://www.google.ca/search?hl=en&q=inurl:%22/community/members/%22+%2Bbuddypress (members page of every BP site on the net)3) How do spammers attack websites?
-> Most spam attacks are done using robots, because sheer volume of posts is usually the winning factor. In situations where there is a “captcha wall” or other defense blocking registration to a “high value” site (hint: yours), spammers will use people in low-wage countries to break the captcha and sign up on the site. The going rate is about $2 per 1000 captchas.
http://www.decaptcher.com/client/
Once inside the site, they will then use bots to post spam to all the members on the site.
-> There are literally *thousands* of different programs available that spam websites, and they all have *different* venerabilities.
For example, this program: http://forums.digitalpoint.com/showthread.php?t=1124949
a) Will DEFEAT a “hidden fields” challenge,
b) Will DEFEAT a “javascript proof of work” challenge,
c) Will FAIL a “captcha” challenge
d) Will FAIL an “Akismet” challenge
e) Will FAIL a “Hashed Form Field ID” challengeBut this program: http://www.botmasternet.com/more1/ , wikipedia: http://en.wikipedia.org/wiki/XRumer , video of it running: http://www.youtube.com/watch?v=AL2i4SNPJmg
a) Will DEFEAT a “hidden fields” challenge,
b) Will DEFEAT a “javascript proof of work” challenge,
c) Will DEFEAT a “captcha” challenge
d) Will DEFEAT an “Akismet” challenge (uses proxy networks, never sends the same message twice)
e) Will DEFEAT a “Hashed Form Field ID” challenge
f) Will FAIL a “enter the numbers with a triangle over them” challenge (as used by PlentyOfFish.com)
g) Will FAIL a “click on the photos of cats but not the photos of dogs” challenge4) How do we stop spammers from attacking BP communities?
-> By making it frustrating and unprofitable (but not necessarily impossible) for spammers to target us; while making these tactics invisible to normal users.
I will cover how I propose to do this in the next post.
^F^
Hi r-a-y — would you be interested in posting your validation function code? (pastebin it perhaps?)
Just want to avoid reinventing the wheel. I also found a plugin in bpdev that appears to be doing this, as well, even down to adapting the existing WPMU recaptcha plugin, but it doesn’t seem to work / was never finished. I haven’t worked out just why yet, however.
http://bp-dev.org/download/You active bpdev-core and then bpdev-nospam.
