R: Fake User-Agent on PDF

[Julian Field]

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This one was published yesterday, which the author claims to work okay:

full            PDF_ONLY_SPAM   
/encoding\:\s+7bit(\n?)+[\-0-9]+.{1,40}type\:\s+application\/pdf\;.{1,40}name\=.{1,40}\.pdf.{1,50}disposition\:\s+inline\;.{1,40}filename\=.{1,40}\.pdf/is
describe        PDF_ONLY_SPAM   PDF only Message, no text in message body
score           PDF_ONLY_SPAM   2.0

Marcello Anderlini wrote:
> Sorry guys, but cause my poor English I'm not sure I've understood if there
> is a good rules to block pdf spam.
> If there is, could someone publish one working ?
>
> Thanks to all for you kindly help.
>
> bye 
>
> -----Messaggio originale-----
> Da: mailscanner-bounces at lists.mailscanner.info
> [mailto:mailscanner-bounces at lists.mailscanner.info] Per conto di Julian
> Field
> Inviato: sabato 30 giugno 2007 22.11
> A: MailScanner discussion
> Oggetto: Re: Fake User-Agent on PDF
>
>
> * PGP Bad Signature, Signed by an unverified key: 06/30/07 at 21:10:58
>
>
>
> Alex Broens wrote:
>   
>> On 6/30/2007 6:58 PM, Julian Field wrote:
>>     
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>>> Hugo van der Kooij wrote:
>>>       
>>>> Hi,
>>>>
>>>> So far all SPAM PDF files that did not get killed on other issues 
>>>> seem to use a fake User-Agent header: User-Agent: Thunderbird
>>>> 1.5.0.12 (Windows/20070509)
>>>>
>>>> According to
>>>> http://www.mozilla.com/en-US/thunderbird/releases/1.5.0.12.html the 
>>>> release date is impossible however.
>>>>
>>>> I have not written a SA rule (yet). I wrote a detectline in my 
>>>> header checks of postfix:
>>>> /^User-Agent: Thunderbird 1.5.0.12 \(Windows/20070509\)/    
>>>> REJECT    This is a fake version of Thunderbird
>>>>         
>>> Here's a SA rule that will do the same thing:
>>> header JKF_FAKE_TBIRD User-Agent =~ /Thunderbird 1.5.0.12 
>>> \(Windows\/20070509\)/ describe JKF_FAKE_TBIRD Fake version of 
>>> Thunderbird score JKF_FAKE_TBIRD 1.5
>>>
>>>       
>> Jules,
>>
>> /Thunderbird 1\.5\.0\.12\(Windows\/20070509\)/
>>
>> forgot to escape periods?
>>     
> Yes, agreed. But it's not very important. A version of the rule that 
> accepts 1-5-0-12 is fine too, that's certainly a fake Thunderbird 
> version number! :-)
>
> Jules
>
>   

Jules

- -- 
Julian Field MEng CITP
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