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Re: The impending DDoS storm
From: Jeff Kell <jeff-kell () utc edu>
Date: Thu, 14 Aug 2003 23:02:08 -0400


Dan Hollis wrote:
On Wed, 13 Aug 2003, Jason Frisvold wrote:
If the blaster cannot get a proper DNS response, it continues to
replicate via port 135... It then goes into a retry cycle and continues
to try to get a good DNS lookup.

has anyone tried tarpitting eg labrea to slow the worm?

Oh yeah, LaBrea sticks 'em *REAL* good...

LaBrea::Tarpit SOURCE IP's
15223 total threads captured, from these 109 IP addresses

LaBrea makes it look like the exploit worked, and it hangs up the worm trying to send the command to 4444. Thread counts get as high as 2546 (as of now) which is 10x the subnet block where the tarpit lives. Had more like 30K threads until this morning when we had a power outage that outlived my small UPS so the numbers above are since ~9:30 EST this morning.

Jeff



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