As you may know, spammer use this technique to get by filters.
<!H>It<!W> is<!N> <!K>a<!L> w<!Q>el<!Q>l <!X>k<!O>now<!B >n <!F>f<!G>a<!V>c <!O>t
<!S>th<!B>at p<!R>eopl<!J>e< !G> <!Z>who <!V>p<!U>o<!P>s s<!F>e<!L>s<!U > <!S>a
<!J>de<!S>gr<!T >ee <!W>a<!K>r<!I>e <!V> l<!O>o<!D>o<!W> k<!C>ed <!J>upo<!R>n<!K >
a<!U>s<!G> <!X>th<!O>e <!E>elit<!U>e<! N><BR>
<!T>
If yo<!Q>u <!B>ha<!C>ve<!Y > a<!S> d<!Q>eg<!E>r<!Y >ee<!E>, yo<!F>u<!N> a<!Z>re<!
M>
<!D>a<!O>l<!G>m <!S>o<!R>st as<!Z>sur<!C>ed to <!D>g<!R>ain<!I >
l<!P>ev<!Z>e<!O >r<!Y>ag<!M>e<! H> <!H>in <!K>t<!N>h<!V>e <!Z> w<!T>o<!Y>rk
<!X>p<!R>lac<!P >e
<!M>
Why would that be considered valid HTML adn viewable by all major browsers?
12  2436 
Mr. Clean wrote: As you may know, spammer use this technique to get by filters.
<!H>It<!W> is<!N> <!K>a<!L> w<!Q>el<!Q>l <!X>k<!O>now<!B >n <!F>f<!G>a<!V>c <!O>t
<!S>th<!B>at p<!R>eopl<!J>e< !G> <!Z>who <!V>p<!U>o<!P>s s<!F>e<!L>s<!U > <!S>a
<!J>de<!S>gr<!T >ee <!W>a<!K>r<!I>e <!V> l<!O>o<!D>o<!W> k<!C>ed <!J>upo<!R>n<!K >
a<!U>s<!G> <!X>th<!O>e <!E>elit<!U>e<! N><BR>
<!T>
If yo<!Q>u <!B>ha<!C>ve<!Y > a<!S> d<!Q>eg<!E>r<!Y >ee<!E>, yo<!F>u<!N> a<!Z>re<!
M>
<!D>a<!O>l<!G>m <!S>o<!R>st as<!Z>sur<!C>ed to <!D>g<!R>ain<!I >
l<!P>ev<!Z>e<!O >r<!Y>ag<!M>e<! H> <!H>in <!K>t<!N>h<!V>e <!Z> w<!T>o<!Y>rk
<!X>p<!R>lac<!P >e
<!M>
Why would that be considered valid HTML
AFAICS, it's not.
adn viewable by all major browsers?
Browsers are supposed to do error correction, and ignore that which
they don't understand, while still attempting to render that which
they do. However, if you're talking about spamming, that's email,
thus news readers, not browsers, correct?
--
Brian
follow the directions in my address to email me
Mr. Clean <mr*****@protct orandgamble.com > wrote: As you may know, spammer use this technique to get by filters.
<!H>It<!W> is<!N> <!K>a<!L> w<!Q>el<!Q>l <!X>k<!O>now<!B >n <!F>f<!G>a<!V>c <!O>t
<!S>th<!B>at p<!R>eopl<!J>e< !G> <!Z>who <!V>p<!U>o<!P>s s<!F>e<!L>s<!U > <!S>a
<!J>de<!S>gr<! T>ee <!W>a<!K>r<!I>e <!V> l<!O>o<!D>o<!W> k<!C>ed <!J>upo<!R>n<!K >
a<!U>s<!G> <!X>th<!O>e <!E>elit<!U>e<! N><BR>
<!T>
If yo<!Q>u <!B>ha<!C>ve<!Y > a<!S> d<!Q>eg<!E>r<!Y >ee<!E>, yo<!F>u<!N> a<!Z>re<!
M>
<!D>a<!O>l<!G> m<!S>o<!R>st as<!Z>sur<!C>ed to <!D>g<!R>ain<!I >
l<!P>ev<!Z>e<! O>r<!Y>ag<!M>e< !H> <!H>in <!K>t<!N>h<!V>e <!Z> w<!T>o<!Y>rk
<!X>p<!R>lac<! P>e
<!M>
Why would that be considered valid HTML adn viewable by all major browsers?
It's not valid HTML.
See http://validator.w3.org/check?uri=ht...st%2Fspam.html
On the other hand browsers ignore unknown markup and so don't display
any of the phoney SGML declarations.
Steve
--
"My theories appal you, my heresies outrage you,
I never answer letters and you don't like my tie." - The Doctor
Steve Pugh <st***@pugh.net > <http://steve.pugh.net/>
"Mr. Clean" <mr*****@protct orandgamble.com > wrote in message
news:MP******** *************** *@news-server.austin.r r.com... As you may know, spammer use this technique to get by filters.
<!H>It<!W> is<!N> <!K>a<!L> w<!Q>el<!Q>l <!X>k<!O>now<!B >n
<!F>f<!G>a<!V>c <!O>t <!S>th<!B>at p<!R>eopl<!J>e< !G> <!Z>who <!V>p<!U>o<!P>s s<!F>e<!L>s<!U >
<!S>a <!J>de<!S>gr<!T >ee <!W>a<!K>r<!I>e <!V> l<!O>o<!D>o<!W> k<!C>ed
<!J>upo<!R>n<!K > a<!U>s<!G> <!X>th<!O>e <!E>elit<!U>e<! N><BR>
<!T>
If yo<!Q>u <!B>ha<!C>ve<!Y > a<!S> d<!Q>eg<!E>r<!Y >ee<!E>, yo<!F>u<!N>
a<!Z>re<! M>
<!D>a<!O>l<!G>m <!S>o<!R>st as<!Z>sur<!C>ed to <!D>g<!R>ain<!I >
l<!P>ev<!Z>e<!O >r<!Y>ag<!M>e<! H> <!H>in <!K>t<!N>h<!V>e <!Z> w<!T>o<!Y>rk
<!X>p<!R>lac<!P >e
<!M>
Just make a filter that identifies as spam any email containing (say) 3 or
more instances of a '<' character followed by a non-alphabetic character
(this can be done in Eudora, not sure about other email programs): attempts
to obfuscate spam like this just makes it easier to positively identify
spam.
Lars G. Svensson wrote: On Thu, 10 Jul 2003 14:30:36 GMT, C A Upsdell <cupsdell0311XX X@-@-
@XXXrogers.com> wrote:
[snip]
Just make a filter that identifies as spam any email containing (say) 3
or more instances of a '<' character followed by a non-alphabetic
character
[snip] What if someone posts a DTD in a plain text mail?
[snip example]
The above message certainly has three (or more!) instances of a '<'
followed by a non-alphabetic char but I wouldn't say it's spam. (I know,
you can't have it all...)
How is the email encoded? If it's encoded as HTML, then the DTD shouldn't
trigger the filters as it will be encoded as <! rather than <!. If it's
encoded as plain text, then it's not using this spamming technique. All
you want to match is the literal string <! in HTML encoded mails.
--
Jim Dabell
On Fri, 11 Jul 2003 09:56:54 +0100, Jim Dabell <ji********@jim dabell.com>
wrote: Lars G. Svensson wrote:
On Thu, 10 Jul 2003 14:30:36 GMT, C A Upsdell <cupsdell0311XX X@-@-
@XXXrogers.com> wrote:
[snip]
Just make a filter that identifies as spam any email containing (say) 3
^^^ or more instances of a '<' character followed by a non-alphabetic
character
[snip] What if someone posts a DTD in a plain text mail?
[snip example]
The above message certainly has three (or more!) instances of a '<'
followed by a non-alphabetic char but I wouldn't say it's spam. (I know,
you can't have it all...)
How is the email encoded? If it's encoded as HTML, then the DTD
shouldn't
trigger the filters as it will be encoded as <! rather than <!. If
it's
encoded as plain text, then it's not using this spamming technique. All
you want to match is the literal string <! in HTML encoded mails.
True. (Think first, post later). Then, however, we're not considering _any_
email any more, but any _html_ email...
--
Lars
Lars G. Svensson wrote: On Fri, 11 Jul 2003 09:56:54 +0100, Jim Dabell <ji********@jim dabell.com>
wrote:
[snip] How is the email encoded? If it's encoded as HTML, then the DTD
shouldn't
trigger the filters as it will be encoded as <! rather than <!. If
it's
encoded as plain text, then it's not using this spamming technique. All
you want to match is the literal string <! in HTML encoded mails.
True. (Think first, post later). Then, however, we're not considering
_any_ email any more, but any _html_ email...
Some people would say that you should just filter out all HTML email
altogether :)
--
Jim Dabell
"Lars G. Svensson" <sv******@dbf.d db.de> wrote in message
news:op******** ******@news.cis .dfn.de... Just make a filter that identifies as spam any email containing (say)
3 ^^^ or more instances of a '<' character followed by a non-alphabetic
character [snip] What if someone posts a DTD in a plain text mail?
[snip example]
The above message certainly has three (or more!) instances of a '<'
followed by a non-alphabetic char but I wouldn't say it's spam. (I
know, you can't have it all...)
How is the email encoded? If it's encoded as HTML, then the DTD
shouldn't
trigger the filters as it will be encoded as <! rather than <!. If
it's
encoded as plain text, then it's not using this spamming technique. All
you want to match is the literal string <! in HTML encoded mails.
True. (Think first, post later). Then, however, we're not considering
_any_ email any more, but any _html_ email...
Which is the type of email in which such obfuscation was used, and a detail
that I left as an exercise for the attentive reader. Fortunately it is
trivial to make a filter that identifies HTML email.
"Jim Dabell" <ji********@jim dabell.com> wrote in message
news:J0******** ************@gi ganews.com... Lars G. Svensson wrote: On Thu, 10 Jul 2003 14:30:36 GMT, C A Upsdell <cupsdell0311XX X@-@-
@XXXrogers.com> wrote:
[snip]
Just make a filter that identifies as spam any email containing (say) 3
or more instances of a '<' character followed by a non-alphabetic
character
[snip] What if someone posts a DTD in a plain text mail?
[snip example]
The above message certainly has three (or more!) instances of a '<'
followed by a non-alphabetic char but I wouldn't say it's spam. (I know,
you can't have it all...)
How is the email encoded? If it's encoded as HTML, then the DTD shouldn't
trigger the filters as it will be encoded as <! rather than <!. If it's
encoded as plain text, then it's not using this spamming technique. All
you want to match is the literal string <! in HTML encoded mails.
The example might not have effectively illustrated the point, but that
doesn't render the point invalid. Are you (or C A Upsdell, who suggested
the filter in the first place) implying that all well-commented HTML mail
should be regarded as spam? Perhaps the sender uses an HTML template for
email which contains comments to assist users in its customization, hide
embedded copyright information, etc. While it's certainly a waste of
bandwidth to do that, it would be rash to automatically regard such messages
as spam.
-David Safar, Devil's Advocate
"David Safar" <gw******@pacbe ll.net> wrote in message
news:4M******** ******@newssvr1 9.news.prodigy. com...
How is the email encoded? If it's encoded as HTML, then the DTD
shouldn't trigger the filters as it will be encoded as <! rather than <!. If
it's encoded as plain text, then it's not using this spamming technique. All
you want to match is the literal string <! in HTML encoded mails.
The example might not have effectively illustrated the point, but that
doesn't render the point invalid. Are you (or C A Upsdell, who suggested
the filter in the first place) implying that all well-commented HTML mail
should be regarded as spam? Perhaps the sender uses an HTML template for
email which contains comments to assist users in its customization, hide
embedded copyright information, etc. While it's certainly a waste of
bandwidth to do that, it would be rash to automatically regard such
messages as spam.
Few filters can identify spam with 100% accuracy: there is usually some
element of doubt. What I do is try to ensure that probable spam is
identified with as few false positives and negatives as possible. Probable
spam is put in the Trash folder and coloured red (Eudora can do this) to
make it easy to identify: and I always review the Trash folder, before
deleting messages from it, to pick out any false positives; these are rare.
I also examine false negatives to decide whether my filters need to be
improved.
My filters do not identify all HTML email as probable spam: but it does
identify HTML email that match certain other filter criteria. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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