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Spam Obfuscation

03/08/2011 11:38 PM

Some spam got through my filter, but I haven't been able to decode this obfuscated address:

k?fp9w5r2xoim7j963a4c4tz610zrbxjg9pf4i753l5yi53si5p55rsufuh56t8qsqe91737rg2rokn82y04z2d5akmx9f6740kwk

It came directly after an http:// and website (not listed here for obvious reasons). I think it's some kind of PHP injection, but it didn't decode completely for base 64. It also may be using cyrillic (hence the question mark as well) but I am not sure.

I have more examples from the same email.

Any assistance appreciated.

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#1

Re: Spam Obfuscation

03/09/2011 7:34 AM

Get rid of it and block the website.

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#2
In reply to #1

Re: Spam Obfuscation

03/10/2011 12:46 AM

It was spam...email

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#3
In reply to #2

Re: Spam Obfuscation

03/10/2011 5:38 AM

You should have a block sender option somewhere in your email program.

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#4
In reply to #3

Re: Spam Obfuscation

03/10/2011 11:02 AM

That's not the point. The question is this: Does anyone on the "Software and Programming" blog know how to decipher the obfuscation of the information I have posted or have any idea which would point me to the programming language used which begins the page string with a letter followed by a question mark? As seen in my first post, the string begins with "k?".

I don't need information on how to secure my computer. It was secure. Nothing happened. I looked at the hidden information from the header of the email message, which was blank except for a link. Within the header and the link was the previously mentioned obfuscated information.

The offending web site is known for this type of malicious activity, and so is the ISP. I am just curious as to their methodology.

U1RGUQ==

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#6
In reply to #4

Re: Spam Obfuscation

03/10/2011 11:08 AM

Sorry, I misunderstood. I don't have a clue about deciphering code.

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#5

Re: Spam Obfuscation

03/10/2011 11:04 AM

This is not a reply really but a similar problem. What do you do with these sites that evidently keep changing their email address. Blocking in OE doesn't do much good. I would really like to stop the foreign email which is obviously a scam reference to money.

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#7
In reply to #5

Re: Spam Obfuscation

03/10/2011 11:12 AM

This is kind of thread hijacking, but try this:

Determine if the messages all have something in common, such as your name in the subject or somewhere in the body in a format that you would not normally see, for example: john.smith. Most of your friends and colleagues would not spell your name that way, but it is a popular method for bypassing spam filters. You would set up OE to delete all messages with the phrase or pattern in the subject, from, body, etc. You could also do the same with your ISP's spam filter in most cases. Contact your ISP's admin, as I am sure they would appreciate the ability to limit spam bandwidth on their system, if they can find the time.

Determine if the emails are coming from the same block of IP addresses. You can block that using more sophisticated spam blockers, or modify your firewall to filter emails based on header content.

The easiest method is the first, as spammers usually use a common method to bypass your filters. Once you determine a pattern, you can set up OE to block that.

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#8

Re: Spam Obfuscation

03/10/2011 7:35 PM

The k? is saying to the server: "Load the page 'k' and give it the parameter(s) that follow the '?'". It is a standard way to post parameters to a web application. As an example, look at almost any URL in the address bar for this forum and you will see this structure. E.g., this post has the form of

newcomment?objectid=66769&objecttype=THREAD

meaning that the file 'comment' on the cr4.globalspec.com server will be loaded and handed the parameters

objectid with a value of 66769

objecttype with a value of THREAD

In your example, the typical name=value stuff has been encrypted in some way so that their content is not easily "sniffed" as it flows across the 'net.

And, no, I cannot help decrypting it.

Regards,

Bill Lee

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#9
In reply to #8

Re: Spam Obfuscation

03/10/2011 9:50 PM

Thanks...that's great info. There were four strings of the same length, so I assume they are automatically generated by a trojan dropper or some similar malware. Those random named executables make it difficult to track.

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