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Another Worm Targets Anti-Spam Sites

kevinvee writes "Yahoo! is reporting about the next battle of Spam Houses versus Spamhauses. This time, its W32/Mimail-L receiving the attention. "It's the third Mimail variation to come after us, except this one is trying to do more," said Steve Linford, founder of The Spamhaus Project. Apparently this reincarnation comes as an attachment offering naked photographs. Once infected, a follow-up e-mail is sent to the user stating that a CD containing child pornography will be delivered to their postal address. "These guys write trojan (viruses), they carry out DDOS attacks and they get their money through selling stolen credit cards and spamming," Linford said."

33 of 538 comments (clear)

  1. Sue the software companies by grub · · Score: 0, Interesting


    If the government can go after the tobacco companies for killing people with their second hand smoke, why can't they go after the software companies that have obviously turned a blind eye to security in the name of profit and the after-market anti-virus industry? It's their shoddy software that allows this to be possible yet they make billions while costing ISPs and end users billions more.
    Hell, some US states are even going after gun manufacturers..

    --
    Trolling is a art,
  2. Good by Karamchand · · Score: 4, Interesting

    I think this is actually a good thing because it links spammers with viruses and therefor reinforces the association "spammer = evil". Perhaps sooner or later more people (and gov. agencies and companies) see spam not just as annoyance but as attack.

    1. Re:Good by southpolesammy · · Score: 4, Interesting

      Worse yet for them, it associates spammers and virus writers with child pornography, which is considered among the lowest of the low for crimes. If this doesn't get those in a position of power to realize the depths of depravity that these people are willing to go to, I wonder if anything will.

      --
      Rule #1 -- Politics always trumps technology.
  3. What proof do they have? by Steve+'Rim'+Jobs · · Score: 2, Interesting

    Seriously, I dislike spammers as much as the next guy, but immediately saying this is the work of a spammer is stretching it just a bit. For all we know the person behind the worm has nothing to do with spam.

  4. Anti-DDOS by Angram · · Score: 4, Interesting

    Isn't there some way to distribute the anti-spam sites/lists so that a DDOS attack can't take it out? All that's needed is a simple neural net-style system - redundancy and distributed content (which the internet makes simple) could solve this sort of problem, at least for now.

    --

    GL
    1. Re:Anti-DDOS by Icarus_SFX · · Score: 1, Interesting
      You could have a look at :
      http://www.agk.nnov.ru/drbl/en/index.html
      They have a distributed network.

      Also a while ago I saw a document describing a form of P2P network with Blocklists. Dunno the URL anymore but it was a kind of nice idea, it included Signatures. So that the network could not be injected with false information.

      But from that point of view you could also use web of trust structure.

      Most Anti-Spam sites use servers located at diffrent sites/parts of the internet.

      Example spamcop.net:
      # dig bl.spamcop.net ANY
      ; <<>> DiG 9.2.1 <<>> bl.spamcop.net ANY
      ;; global options: printcmd
      ;; Got answer:
      ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 45125
      ;; flags: qr; QUERY: 1, ANSWER: 8, AUTHORITY: 0, ADDITIONAL: 8

      ;; QUESTION SECTION:
      ;bl.spamcop.net. IN ANY

      ;; ANSWER SECTION:
      bl.spamcop.net. 172800 IN NS blns9.spamcop.net.
      bl.spamcop.net. 172800 IN NS blns7.spamcop.net.
      bl.spamcop.net. 172800 IN NS blns10.spamcop.net.
      bl.spamcop.net. 172800 IN NS blns11.spamcop.net.
      bl.spamcop.net. 172800 IN NS blns6.spamcop.net.
      bl.spamcop.net. 172800 IN NS blns8.spamcop.net.
      bl.spamcop.net. 172800 IN NS blns5.spamcop.net.
      bl.spamcop.net. 172800 IN NS blns4.spamcop.net.

      ;; ADDITIONAL SECTION:
      blns9.spamcop.net. 172800 IN A 208.39.222.166
      blns7.spamcop.net. 172800 IN A 216.234.115.20
      blns10.spamcop.net. 172800 IN A 206.67.234.112
      blns11.spamcop.net. 172800 IN A 209.92.188.201
      blns6.spamcop.net. 172800 IN A 209.198.142.146
      blns8.spamcop.net. 172800 IN A 66.6.205.130
      blns5.spamcop.net. 172800 IN A 198.145.240.35
      blns4.spamcop.net. 172800 IN A 194.109.6.147

      ;; Query time: 3617 msec
  5. Re:A new low by Saint+Aardvark · · Score: 5, Interesting
    No kidding.

    It's absolutely insane. They won't stop 'til they've destroyed email.

    It's melodramatic, but: spammers really have declared war on email, and the Internet and its users as a whole. They're fucking with email, they're fucking with DNS, they're sending out viruses to infect users and spread more filth, and they're trapped in this huge positive feedback loop that I'm desperately afraid won't end. They pump out millions of emails which get ignored so they pump out more which gets them blocked so they pump out more to get around that and they start attacking their opponents and now the volume of spam is so high they need to pump out even more just to get any sort of return...

    Rationally, I think the only way around it is to attack the economics of spam, as has been suggested by many much smarter than me.

    But really, what I want is revenge.

  6. Focus by Space+cowboy · · Score: 2, Interesting

    Virus experts said the outbreak was light compared to the rash of worms and viruses that plagued the Internet last summner. "We have had reports in the dozens, not in the hundreds," said Graham Cluely, senior technology consultant for Sophos

    Yes, but when those virii are targetting one machine instead of the internet as a whole, it makes something of a difference, Graham...

    Simon
    --
    Physicists get Hadrons!
  7. It gets worse - by m4ilm4n · · Score: 5, Interesting

    I've just received a fake "mailer daemon" rejection message with a viral attachment; although my a/v program caught it, I can see this tactic catching even the most suspicious of us...

  8. A honeypot credit card for spammers.... by LilJC · · Score: 5, Interesting
    We all know the practice of creating an email account, leaving it hidden online somewhere or posting it and telling people not to use it in an effort to get email we are sure is not legitimate. If this works, let's take it a step farther.

    Mastercard, wait, even better AmEx issues a card with the same idea. The card is used once in response to a single spam. The card is then cut up but not cancelled. Hand the card numbers and the billing address over on a platter.

    When the card is used again, set your phasers to sue. The beneficiary of the card's usage can either be charged with fraud, etc. or roll on their superior. Pass the buck up the ladder until you can jail a spammer not on the basis of spam but of felony(ies).

    Of course, this assumes that you can find a "member magnifier" offer that isn't even looking to send you Sucrosa. Still, it might be worth a shot as a low-cost investment with a good potential for a high yield.

    The same idea could be used for eBay and PayPal scams. It's not as if none of us have gotten those "Please enter your password in this email and click submit button" spams. I wonder if this is already done. I'm a smart guy, but I'm still just another geek on /.. It seems some well-compensated theft prevention exec would have started doing this a long time ago if it would work. Though honestly, I don't see any problems with it myself.

    --

    The only thing more dangerous than a file named -rf is renaming it -rf\ /
  9. Funny by wampus · · Score: 3, Interesting

    As much as I hate spam and worms and such, that is too funny. Some dumb bastard tries to get the free pr0n from the email, gets infected, then gets scared to death because they lock you up for a LONG time for possessing kiddy pr0n.
    Maybe this is vigilante spam, using the scared straight theory. Next time Joe Sixpack tries to look at the free pr0n, a little voice will pop up and remind him of what happened LAST time.

  10. Why is it so hard to track these guys? by Kombat · · Score: 3, Interesting


    What they're doing amounts to terrorism (at least, under today's NewSpeak definition of "Terrorism"). Why are the authorities not trying to track these guys down? How hard can it be? It is extremely difficult to completely cover your tracks on the net. You find out where an email came from. Track it back to the ISP. Find out where it came from. Track it back to the next ISP. Check their logs. Continue until you get to a modem pool/DSL connection. There's your guy.

    Are they all outside the country? Will those foreign ISPs not cooperate? Why is this so common?

    --
    Like woodworking? Build your own picture frames.
  11. ISP's need to block egress port 25!! by RT+Alec · · Score: 3, Interesting

    This is getting ridiculous. All of these worms/viruses of late have their own SMTP engine built in, and connect directly to external SMTP servers to spread their payload. ISP's (and businesses that provide access to internal workstations) need to block access to external SMTP servers! In particular, block egress port 25 from the network.

    So you will ask, "But then how will I use my company's or other SMTP servers from home?" Easy, the port used for initial mail submission (IMS) should be set to a different port altogether. IMS and mail transport are different activities and should be treated as such. Use SMTP+AUTH+SSL, run it on port 465, and everybody is happy (except spammers and virus authors).

    "But I want to run my own server on my dial-up or other consumer level account!" Contact your ISP and see if you can get a static IP address. SMTP servers should be on static IPs, that way bounces and other system messages can be routed properly. Check the AUP of your ISP, you might be prohibited from running a server on your account (find another ISP, or use the tip above to use a different SMTP server).

    To do otherwise is to continue to be part of the problem, not part of the solution.

    1. Re:ISP's need to block egress port 25!! by RT+Alec · · Score: 3, Interesting
      SMTP allows any IP host to transfer mail to any other IP host

      That's exactly the problem. Mail is not supposed to be transmitted from any IP host to any IP host. The way it is supposed to work is:

      1. End user submits mail to their SMTP server
      2. SMTP server queues the mail, looks up the MX hosts of the recipient, and attempts delivery (this step may take time, due to internet congestion, etc.)
      3. Recipient's SMTP server receives the message (possibly from a backup MX host)
      4. SMTP server delivers the message to recipient's POP/IMAP/etc. server (maybe Exchange)
      5. Recipient accesses message using their e-mail client (Pine, Outlook, Eudora, Mozilla, etc.)
      In particular, the message is not sent directly from the sender to the recipient! That won't work-- what if the recipient's workstation is off? What if the recipient uses several different computers (devices) to access their mail? SMTP was reasonably well thought out, the only problems realy are that IMS and mail transport were originaly designated to use the same port, and there was no encryption or authentication built in. Now with SMTP+SSL+AUTH, and IMS on an alternate port, it is pretty robust.
  12. Why not just go with their model, at least..partly by zippity8 · · Score: 2, Interesting

    I never really understood why someone didn't just contact the CC companies and get a really low limit on their credit cards. Hell, even TELL them that you're going to use it for "verification purposes" online, so that you'd want to know who tried to charge money to it. I don't know if you can, but ask them to keep track of where it was rejected.

    Enter the number once, and watch the traceable info for spammers / people that buy this information just ROLL in.

    It may be time-consuming, but so is this battle with attempting to blacklist spammers.

  13. Revenge? by $ASANY · · Score: 5, Interesting
    I got some revenge for ya...

    As promised, there's a new tool in town. Project Web Form Flooder is still in beta, but it's functional in flooding spammer's websites with plausible data. Java source code only right now, but I'd imagine the ./ crowd can deal with that.

    If we flood spammer's websites with garbage data, maybe, just maybe we'll do a little to remove the profit motive in spamming, and once there's no money in it it'll end.

    Isn't it time we stopped crying and started doing something?

    1. Re:Revenge? by hellraizr · · Score: 5, Interesting

      If we flood spammer's websites with garbage data, maybe, just maybe we'll do a little to remove the profit motive in spamming, and once there's no money in it it'll end.

      Yes but unfortunatly most spammers have enormous clusters of servers for what they do and more bandwidth than you can shake a stick at (thats the only way the upstream providers will let them spam, they need 20mbit, they buy an OC-3). it would really be no big deal for spammers to survive a DDoS attack, it would take him down for maybe MAYBE 2 hours. how do I know this? I used to work for one. he was more legitimate than "make your penis bigger", all his lists were 2x optin but being in the biz I met all the other spammers down here in Boca Raton FL (the american capital of spam).

      To put it in perspective, one spammer had somewhere around 500 servers taking up an entire row of racks in the datacenter we were at. another one had 350. the guy I worked for was comparably small, less than 50 servers. and all these guys have enormous burstable bandwidth behind them (spam eats up somewhere around 100-300mbit/sec when doing the initial dns caching)

      Another thing is spammers usually hire VERY good technicians and pay them very well (which is why I stayed working for a spammer). it would be no big deal during a ddos attack, to swap out ip pools on the network (most spammers own tons of ip networks and multiple AS #'s), reprogram the router and setup LVS on 6-8 boxes and it would be able to take most any DDoS you could throw at them.

      Oh and finally spam makes money. TONS AND TONS of money. hundreds of thousands of dollars profit a month usually run by 3-4 guys, so there's always room for ways around whatever we can dish at them. they simply have more resources than the userbase they spam.

    2. Re:Revenge? by leviramsey · · Score: 3, Interesting

      It's mostly from people who come out of a regular job with an idea to sell widgets online. They see an ad in one of those "business opportunities" magazines for a spammer. They sign up, pay, say $10,000 for a list of 10 million email addresses ("A tenth of a cent per email? With a 1 percent response rate (and my widgets and pitch are so good, 1 percent is the minimum!) that means 10 cents per response. I make $10 on every widget. I'm going to be RIIIIIIIIIIIICH!"). The response rate is pitiful, they lose money on the promotion, and they either learn the lesson or move to another spammer. Eventually the business fails.

      However, there's enough entrepreneurs (and pseudo-entrepreneurs thanks to tax code insanity like the fully-deductible Escalade...) to make spamming a gold mine.

      The media isn't really publicizing how ineffective spamming is. All they say is how much money the spammers are making. In the mind of the mental midgets who start these companies, if they see that their SSP (Spam Service Provider) is a millionaire, they think, "this has gotta be working." Of course, it's that type of thinking that proves irrefutably that most people are idiots. Call me crazy, but I want those providing services to me to be as poor as possible....

  14. Re:baseball bat by Rasta+Prefect · · Score: 4, Interesting
    Get a life : it's email, it won't kill you.
    Just use a decent mailer, some antispam filter and update it.

    Why would you just physically hurt somebody ?


    I can think of plenty of reasons. Like, say, promoting child and bestiality porn. To anyone, including children. Because they refuse to take no for an answer and mutate their mail around my spam filters. Because they hammer mailservers with dictionary attacks, wasting resources that aren't theirs. Because they pull the kind of crap referenced in this story. Because they file frivolous lawsuits against anti-spam organizations who are just trying to help people avoid their crap, so that they can try and drain their resources. Because the email address I've used as a public point of contact on my websites is so flooded with bestiality porn that I'm afraid to open it in public.

    In short, I don't think it's the right response, but theres certainly plenty of motivation to do so. I'm not going to cry over it if someone takes a baseball bat to Alan Ralsky's head.

    --
    Why?
  15. I've seen worse by Anonymous Coward · · Score: 1, Interesting

    Probably the most impressive, presumably malicious attachment I've seen so far has been one I've had a few copies of recently. When I first saw it, it looked surprisingly plausible:

    "Hello there,

    I would like to inform you about important information regarding your email address. This email address will be expiring.
    Please read attachment for details.
    "

    It claimed to be from 'admin' at my email provider, an address which actually exists and I have had mail from them in the past, so even I had a second look...

    It had an attached Zipfile, message.zip, containing a message.html, which began...

    "MIME-Version: 1.0
    Content-Location:File://foo.exe
    Content-Tran sfer-Encoding: binary"

    Then a binary which definitely looked like a Windows executable. The whole attachment was about 35kB in size, so fairly plausible for a reasonably complex HTML document.

    Anyone know what it might be? The apparent HTML payload in a Zipfile seems pretty innocuous at first glance, so you have to be even more careful. I'm using an up-to-date Pine on a remote FreeBSD machine, so I was perfectly safe, but I can really imagine others being caught

  16. Yes, us victims deserve all the blame. by dpbsmith · · Score: 5, Interesting

    It's easy to say "don't open obvious spam at all" and "never open an attachment" and "never click on a URL in an email."

    Personally, my middle-aged brain only functions at about a four-nines reliability level, meaning that if I deal with thirty pieces of email a day, about once a year I'll accidentally do something STUPID.

    Like pressing "reply" before I've finished composing my mail. Or replying to all when I only meant to reply to one. Or replying to a list when I only meant to reply to one person on a list. Or thinking that PayPal might really have sent me an email. Or opening a foreign attachment. Typically I realize that I've goofed approximately five hundred milliseconds after performing the mouse click that commits me to the imprudent action.

    (It doesn't help that I actually have real human friends who do send me email message with subject lines that are blank, or consist of the single word "Hi!" or "Meeting.")

    I am sure that you never ever do anything STUPID, and I fully agree with you that someone as STUPID as I deserves to have my computer infected with viruses.

  17. DIE SPAMMER DIE! by BubbaTheBarbarian · · Score: 5, Interesting

    Cannot resist this one...

    OK kids, sit down and let uncle bubba explain this one for you. One, if you see something once, it might be a coincidence. Twice means that maybe lighting is hitting the outhouse twice. This is the third one of these, and with each successive version, the methods and operations of the virus are getting more effective and efficient. That means at least two developers were able to reverse engineer and increase the efficiency of the payload of the virus, OR someone is monitoring what is going on and making improvements. Tell you what, I will let you think about that one for a sec...

    We also have the comments from the spammers themselves. Many have come out into the open and said that anti-spam orgs declared war on them, and that they would fight back. Do you honestly think that this is just a chance happening?

    I guess it could be, I mean, you could have some slashdotter waging a disinformation campaign targeting anti-spammers to piss everyone off...

    Oh, and too the nuts want to sue Microsoft under the same pretenses as suing gun manufactures...dude, spammers are equal opportunity abusers...they are abusing open protocols as much as they are using OS holes to propagate this crap. So unless you want to sue Berkley or something like that...

    Spammers evil...viruses evil...censorship evil...censoring spam ev...WAIT!...good...

    "We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns -- the ones we don't know we don't know."

  18. why blame spam? by gunfinger · · Score: 4, Interesting

    i have yet to see anyone point out WHY spam is actually as effective as it is -- people buy into it!

    if spam wasn't a money-maker, spammers wouldn't exist, it's as simple as that. just like if diets weren't such a huge industry, you wouldn't be seeing posters on how you could lose 30lbs in 30 days plastered all over your city (the birth of spam, might i add).

    if all these men just stopped caring about the size of their weenies, spam would take a huge hit. if we'd all be a bit smarter and not even consider clicking on insurance / any financial links in spam, that market would also take a huge hit. and if we were all more passionate with our partners then that takes care of goat / bestiality porn. the 'barely legal' crap, you have to deal with on your own. that's just wrong.

    honeypots, bayesian filters, spam blockers, LAWS... so much time, effort and money is being put into something that will only be solved once we start dealing with our own insecurities / needs.

    --
    ### http://www.gunfinger.com ### greed / tec
  19. Re:A new low by scrytch · · Score: 2, Interesting

    > It's absolutely insane. They won't stop 'til they've destroyed email.

    s/email/every public commons/
    These people can, have, and will spam by email, fax, autodialers, IM, SMS, spyware, and every single method of communication they can get their hands on that makes it cheap to publish.

    The feedback loop will certainly end ... when there isn't a commons left. When we've all retreated into isolated communities and protocols, and will have to pay for the privelege of connecting with strangers, under the rare circumstance anyone might even treat contact from a stranger as anything but suspicious. Where that contact will be monitored and regulated, ostensibly to reduce spam, but nevertheless we will need the permission of the gatekeepers to push out any decent quantity of content.

    FTC Commissioner Orson Swindle (I love that name) has said about spam "what we need are a couple of good hangings". While the government continues to do the one thing it's good at, make harrumphing noises at the problem, nothing whatsoever is being done about this ongoing criminal behavior, let alone unethical hucksterism. I'm not a fan of government intervention, mind you -- it'd just be nice if they just started enforcing the laws they actually have on the books.

    --
    I've finally had it: until slashdot gets article moderation, I am not coming back.
  20. Re:A new low by Saint+Aardvark · · Score: 2, Interesting
    What? Nice troll. Point out the word "taxing" in my post. I'll wait.

    Okay, my fault for feeding the trolls, but:

    When I talk about "attacking the economics of spam," what I mean is making it unprofitable to be a spammer. I think there are lots of ways to do this; taxing, while one way, is a particularly stupid and noxious method.

    Here are things I think will work to varying degrees:

    I think the best idea is spidering websites. What if spamming meant inviting a massive DOS on your website?
  21. Re:I love this.. by ToW85 · · Score: 2, Interesting
    by labeling me as a spammer even though I've never touched the stuff in my life

    Sounds like your IP is inside a CIDR block listed by SPEWS (or something similar). If it happened to be SPEWS (your symptoms certainly match), did you actually bother to read the SPEWS FAQ?

    There certainly is a reason why you got blocked. Either someone has sent spam from your IP (if you have dynamic IP) or spam has been sent from the same netblock (and your ISP didn't bother to eject the spammer scum).

    If you present this kind of accusations, we (or at least I) would like to hear some more details...

    --
    99 bottles of beer on the wall... take one down, chug it a-down 98 bottles of beer on the wall... 98 bottles of beer on
  22. Re:A new low by TheMidget · · Score: 3, Interesting
    Heck everyone pretending to reply is another one, which forces to spammer to follow many false leads.

    Even better: pretend to buy. Some spammer's site are so easy to crack (hint: SQL-injection) that it's a joke.

    Harvest credit card numbers (with matching delivery and billing addresses, and often with matching CVV's) on one spammer's site, and use them on another's.

    If enough people do this on a routinely basis, several things will happen:

    • The word will spread about among buyers of spamvertised products that buying these is a surefire way to get trouble with their credit card
    • Excessive rate of chargebacks make many spam operations unprofitable
    • Credit card companies will realize that spammers are troublesome business partners, and become very reluctant to give them merchant accounts.
    Hit them in the pocketbook (but use an open proxy, unless you want to get into trouble yourself...)
  23. Re:Too evil? by Zak3056 · · Score: 4, Interesting

    Just something to think about: This article talks about spammers along with references to not only spam, but destruction of anti-spam, virii, pornography, theft, identity theft, and child pornography. The only way they could really make spammers look any worse is if they labeled them as baby rapists.

    While it could be true, it's beginning to sound like propaganda, intending to make these guys look more Evil than life. Think about the article's motivation, author, and target audience. Be careful, there may be something more going on than what we see on the surface.


    You DON'T HAVE TO make this kind of stuff up--the spammers are more than happy to provide the real thing!

    The virus in question (mimail.L) offers porn, claims to be sending you child porn, attacks anti-spam sites, and tries to associate those anti-spam domains AS CRIMINALS in the minds of the target.

    What do you WANT the article to say? That these spammers/virus writers are misunderstood, because they had poor childhoods and their mothers didn't like them?

    Take off the tinfoil and open your damn eyes.

    --
    What part of "shall not be infringed" is so hard to understand?
  24. Re:A new low by JuggleGeek · · Score: 2, Interesting
    Some spammers appear to have some fairly direct ties to organized crime. Eddy Marin, for instance, is a well known spammer from Boca Rattan. He also has also been busted in the past for cocaine sales. It's led me to wonder if some spammers are using their "legitimate opt in marketing" as a way of laundering money. There is no way for anyone looking in to tell how much money they really made by spamming, so they can report that they are making a profit (regardless of whether they sold anything) and use that as a way to make the money look legitimate.

  25. Re:baseball bat by Tackhead · · Score: 2, Interesting
    > In short, I don't think it's the right response, but theres certainly plenty of motivation to do so. I'm not going to cry over it if someone takes a baseball bat to [a noted spammer's] head.

    Agreed. I don't advocate extralegal violence against spammers, but were such a thing to happen, and were I asked to sit on the jury of the person charged with the offence, I would return a verdict of not guilty. Assault and/or homicide are crimes against human beings. In my system of values, spammers ceased to qualify as such several years ago.

    If asked for my views on spammers during jury selection (DAs in spammer-infested areas take note, I'm by no means the only one), I would admit as such and would likely be removed from the pool of eligible jurors. If not asked during jury selection, I would simply stick to my guns during deliberations and demand a verdict of not guilty on the grounds that neither an assault nor a homicide was committed.

    My beliefs would most likely result in a hung jury and a retrial, or, (in the extremely improbable event that I sway the other 11), jury nullfication -- the setting of a precedent that in that court's jurisdiction, and unless/until the verdict is overturned by a higher court, spammers are no longer protected by laws intended to protect human beings. Let hilarity ensue.

  26. Re:Small tangent... by letxa2000 · · Score: 2, Interesting
    You notice the .biz thing because there are a lot fewer of them.

    It's the ratio.

    In my Bayesian corpus, the .COM extension in an HTML tag is a 90.43% spam probability (because most of my non-spam doesn't have HTML tags) and a 22.0% spam probability in free text.

    Meanwhile, BIZ is a 99.92% spam probability when found in an HTML tag and a 90.5% spam probability in free text.

    So, yes, .BIZ is a good spam token and I, too, have thought about filtering everything .BIZ. The main reason I don't is because my Bayesian filter catches 99.9% of it all anyway so there's no reason to bother increasing my false positives by filtering BIZ.

  27. spammers' weak point - credit card companies by tomato · · Score: 3, Interesting

    Spammers do indeed have a weak point. They are dependent on procesing their payments via credit card companies.

    I once tried to set up an online business that would accept payment via credit card. To set up a trading account, you have to jump through all sorts of hoops and rules. It's not cheap or easy. The credit card comapnies cheak who you are quite rigourously before they will give you a business trading account.

    Part of their rules is that the trader must clearly identify theirself/the business when making a sale.

    There are only a very few credit card companies - amex, visa, mastercard, mbna, that covers about 80% of the market.

    I'm not quite sure how to go about informing the credit card comanies that you have received an illegal credit card payment request. Perhaps you could send the spam to them, or the url of the actual webpage where it asks to fill in your credit card numbers.

    For the desperate, you could actually pay something, maybe using a spare card that you never use, then at once inform the credit card company of the situation, requesting a refund, and giving them relevant details, e.g. the website with the unlawful request on it, so that they will place a black mark against the trading account of the spammer.

    Too many of them and they will close his trading account. With the resources that credit card companies have for checking on background, its gonna be bloody hard for the spammer to reopen new acocunt, especially as lying for the purposes of getting a trading account is something that the police take REALLY seriously...

    (close your card or keep an eye out for any further withdrawals from your account and instantly notify the credit card company - they will then know the spammer's been passing around your details and have his address on file - more charges for the police to use)

    What do you think of this method?

    -tomato

    1. Re:spammers' weak point - credit card companies by Anonymous Coward · · Score: 1, Interesting

      > What do you think of this method?

      nice try, but no banana...

      If we *knew* for a fact that the credit card company was itself spotless then just maybe it would work. But I can tell you from personal experience that our company had several charge reversals from end clients. A couple were lagit, but about a half dozen were generated from inside the credit card companys Discover and American extress. As a matter of course we called the customer to ask what the problem with the order was. In something like 6 of these cases the customer told us that they loved the product. We of course asked them why they reversed the charges, and they were amazed. In a couple of these cases, the customer wrote letters to us and even included their credit card statements to show that they never received the chargeback. Long story short, the money was never found -- the credit card company denies everything...

      If someone has *inside connections* they can hide the transactions... So, nice idea, but I doubt that it would work in practice.