Security Incidents mailing list archives

Re: A new technique to disguise a target URL in spam


From: "E.Kellinis" <me () cipher org uk>
Date: Mon, 5 Apr 2004 17:00:12 +0100

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This kind of filtering can probably apply to almost all fake emails
we all receive from time to time. The techniques spammers rely 
use  the following methods to fake their identity : 

A Variation on Dotted-Decimal IPs 
Octal IP address
Not Dotless, But Less Dots
Octal IP Addresses 

The password field some times is used
http://www.sun.com () www cipher org uk

Look at : http://www.pc-help.org/obscure.htm

and Javascript on urls can be suspicious sinice it is mostly used on 
scam emails exploiting cross site-scripting in different websites.

In This link  http://www=2emcafee=2ecom/ 
the Hex translated wrongly so instead of %2E  , =2E came out 
Hex value %2E  is the dot '.'


A filter containing all that can probably cut off big amount of spam

Manos



=========================================================
*PK:http://www.cipher.org.uk/files/pgp/cipherorguk.public.key.txt
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Version: PGPfreeware 7.0.3 for non-commercial use <http://www.pgp.com>

iQA/AwUBQHGCiU5R4JfncDA4EQKq1wCeKw4CkGgW3ZXBVSpU5AuL4xWrJtUAoMrj
leeqNsqYj7uryotQsusvTNIR
=CnFa
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