adni18
Member
OP
More info about it. <br /> <br />August 12th 2003 11:26 EDT <br /> <br />RPC DCOM WORM (MSBLASTER) <br />This RPC DCOM worm started spreading early afternoon EDT (evening UTC). At this point, it is spreading rapidly. <br /> <br />Increase in port 135 activity: http://isc.sans.org/images/port135percent.png <br /> <br /> <br />********** <br />NOTE: PRELIMINARY. Do not base your incidents response solely on this writeup. <br />********** <br /> <br /> <br />Executive Summary: <br /> <br />A worm has started spreading early afternoon EDT (evening UTC Time) and is expected to continue spreading rapidly. This worms exploits the Microsoft Windows DCOM RPC Vulnerability announced July 16, 2003. The SANS Institute, and Incidents.org recommends the following Action Items: <br /> <br />* Close port 135/tcp (and if possible 135-139, 445 and 593) <br />* Monitor TCP Port 4444 and UDP Port 69 (tftp) which are used by the worm for activity related to this worm. <br />* Ensure that all available patches have been applied, especially the patches reported in Microsoft Security Bulletin MS03-026. <br />* This bulletin is available at http://www.microsoft.com/technet/security/bulletin/MS03-026.asp <br />* Infected machines are recommended to be pulled from the network pending a complete rebuild of the system. <br /> <br /> <br />The worm may launch a syn flood against windowsupdate.com on the 16th. It has the ability to infect Windows 2000, XP and potentially 2003. <br /> <br />The worm uses the RPC DCOM vulnerability to propagate. One it finds a vulnerable system, it will spawn a shell on port 4444 and use it to download the actual worm via tftp. The exploit itself is very close to ´dcom.c´ and so far appears to use the "universal Win2k" offset only. <br /> <br /> <br />Detection: Existing RPC DCOM snort signatures will detect this worm. The worm is based on dcom.c <br /> <br /> <br />Removal and Eradication: <br /> <br /> <br />Once you are infected, we highly recommend a complete rebuild of the site. As there have been a number of irc bots using the exploit for a few weeks now, it is possible that your system was already infected with one of the prior exploits. Do not connect an unpatched machine to a network. <br />If you can not do this and/or the computer resides on a protected or non-Internet connected network, then several Anti-Virus Venders have supplied tools to assist in removing the worm. However, these tools can not clean-up damage from other RPC DCOM malware such as the recent sdbot irc bots. This method of cleaning your system is _not_ recommended, but the URLs are presented below for completeness. <br /> <br />http://www.sarc.com/avcenter/venc/data/w32.blaster.worm.removal.tool.html <br />http://www3.ca.com/Files/VirusInformationAndPrevention/ClnPoza.zip <br /> <br /> <br /> <br /> <br /> <br />
