Security Basics mailing list archives

Re: help with "malicious" url embedded in email


From: dan.crowley () gmail com
Date: 2 Jun 2009 18:51:51 -0000

This url actually does not seem to be enciphered nor encoded. This calls a script called "c" on xxx.net with some 
strange variable value sent to it. Since this is a malicious email, this is probably to confirm that you received the 
email. If they send out unique serial strings in every email linked to an email address that they're not sure actually 
exists and someone visits that URL, they know that the email address is valid and that someone was curious.

Basically, once you visit this URL, spammers know that you're a valid target.

This is a best guess, by the way, I can't be certain that they're actually doing this, but the URL is not obfuscated or 
enciphered, though the variable value might be.

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