-----Original Message----- From: Marc Maiffret [mailto:marc(a)eeye.com] Sent: Friday, 20 July 2001 8:55 a.m. To: BUGTRAQ Subject: Update to "Code Red" Worm. Its a date bomb, not time.

Thanks to Eric from Symantec for tossing us a note about the worm being Date based and not Time based.

We made an error in our last analysis and said the worm would start attacking whitehouse.gov based on a certain time. In reality its based on a date (the 20th UTC) which is tomorrow.

If the worm infects your system between the 1st and the 19th it will attempt to deface the infected servers web page or try to propogate itself to other systems. On the 20th all infected threads will attempt to attack www.whitehouse.gov. This seems to continue until the worm is removed from the infected system.

Any new infection that happens between the 20th and 28th will most likely be someone "hand infecting" your system as all other worms should be attacking whitehouse.gov. If for some reason you are infected between the 20th and the 28th then the worm will begin attacking whitehouse.gov without trying to infect other systems. This attack will continue indefinitly.

The following are rough numbers, but we felt that it was important to illustrate the affects this worm can _possibly_ have.

The worm has a timeline like this:

day of the month: 1-19: infect other hosts using the worm 20-27: attack whitehouse.gov forever 28-end of month: eternal sleep

Presumably, this could restart at any point in a new month again.

Also, some stats for the attack:

Each infection has 100 threads Each thread is going to send about 100k, a byte at a time, which means you have a (40 for ip + 1 for each byte) which means you have 4.1 megs of data per thread 100 threads * 4.1megs = 410 Megabytes This will be repeated again every 4.5 hours or so

Remember, each host can be infected multiple times, meaning that a single host can send 410MB * # of infections.

We have had reports between 15 thousand and 196 thousand unique hosts infected with the "Code Red" worm. However, there has been cross infection and we have heard reports of at least 300+ thousand infections/instances (machines with multiple infections etc..) of this worm.

If there are 300 thousand infections then that means you have (300,000 * 410 megabytes) that is going to be attempted to be flooded against whitehouse.gov every 4 and a half hours. If this is true and the worm "works as advertised" then the fact that whitehouse.gov goes offline is only the begining of what _can_ possibly happen...

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I am actually writing this part of the eMail about 45 minutes after the first part because our Internet connection here in california has been going up and down. We have also heard reports of internet connectivity going down in parts of northern california and new york.

Signed, eEye Digital Security T.949.349.9062 F.949.349.9538 http://eEye.com/Retina - Network Security Scanner http://eEye.com/Iris - Network Traffic Analyzer http://eEye.com/SecureIIS - Stop known and unknown IIS vulnerabilities

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