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Dropping tools and malware using DNS
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Dropping tools and malware using DNS
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jimbob
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Dropping tools and malware using DNS
«
on:
June 09, 2010, 06:27:49 AM »
Hi,
I blogged about the notion of using DNS TXT records to delivery binary files to a compromised system. Here is the link...
http://jimhalfpenny.blogspot.com/2010/06/delivery-your-malware-by-dns-http-is.html
I hope it's interesting to the folks here.
Regards,
Jim
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Ketchup
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Posts: 1021
Re: Dropping tools and malware using DNS
«
Reply #1 on:
June 09, 2010, 07:11:37 AM »
Jim, that's an interesting idea! I believe that the individual TXT record size limitation is 255 characters. You can can get some fairly large file encoded this way, especially if you are splitting them up like you are. DNS even takes care of dealing with UDP traffic. Very nice!
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yatz
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Posts: 222
Re: Dropping tools and malware using DNS
«
Reply #2 on:
June 09, 2010, 07:41:04 AM »
That's really interesting! How do you suppose you would get the record on the DNS server? Maybe something inside a trusted dynamic DNS update?
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jimbob
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Re: Dropping tools and malware using DNS
«
Reply #3 on:
June 09, 2010, 09:34:47 AM »
Quote from: yatz on June 09, 2010, 07:41:04 AM
How do you suppose you would get the record on the DNS server? Maybe something inside a trusted dynamic DNS update?
You could add the records to a domain you have own, or to a zone file on a compromised DNS server. I'm not sure about dynamic DNS but that would be a novel way of setting up the records.
Jim
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