North American Network Operators Group
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Re: RPC errors and latest worm

  • From: Stewart, William C (Bill), RTSLS
  • Date: Mon Aug 11 19:39:23 2003 
According to http://isc.sans.org/diary.html?date=2003-08-11 ,
the worm uses the latest popular MS exploit ports, so 
"	 * Close port 135/tcp (and if possible 135-139, 445 and 593) ".

It also uses TCP port 4444 and TFTP = UDP 69 to download its
attack code after getting the initial bootstrap infection.
So you probably want to be blocking TCP 4444 and (if appropriate,
which it usually is, TFTP), and tracing any 4444 activity and TFTPs
to detect attacks.