Sorry, the first one I posted was not so much informative. Let me try again. If it is interesting for people who got hit from this worm and need to desinfect their computers manually: I got this detailed description what it does and where it makes changes from the NTBUGTRAQ mailing list. I hope this is not too much Off-Topic but can help somebody. It seems that older systems with Win 3.x cannot be infected... (hopefully) ------- Forwarded Message Follows ------- Date: Thu, 4 May 2000 09:56:18 -0700 Reply-to: [log in to unmask] From: Elias Levy <[log in to unmask]> Subject: [BUGTRAQ] ILOVEYOU worm X-To: [log in to unmask] To: [log in to unmask] A new VB worm is on the loose. This would normally not be bugtraq material as it exploits no new flaws but it has spread enough that it warrants some coverage. This is a quick and dirty analysis of what it does. The worm spreads via email as an attachments and via IRC as a DCC download. The first thing the worm does when executed is save itself to three different locations. Under the system directory as MSKernel32.vbs and LOVE-LETTER-FOR-YOU.TXT.vbs and under the windows directory as Win32DLL.vbs. It then creates a number of registry entries to execute these programs when the machine restarts. These entries are: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run\MSKer nel32 HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServic es\Win32DLL It will also modify Internet Explorer's start page to point to a web page that downloads a binary called WIN-BUGSFIX.exe. It randomly selects between four different URLs: http://www.skyinet.net/~young1s/HJKhjnwerhjkxcvytwertnMTFwetrdsfmhPnjw 6587345gvsdf7679njbvYT/WIN-BUGSFIX.exe http://www.skyinet.net/~angelcat/skladjflfdjghKJnwetryDGFikjUIyqwerWe5 46786324hjk4jnHHGbvbmKLJKjhkqj4w/WIN-BUGSFIX.exe http://www.skyinet.net/~koichi/jf6TRjkcbGRpGqaq198vbFV5hfFEkbopBdQZnmP OhfgER67b3Vbvg/WIN-BUGSFIX.exe http://www.skyinet.net/~chu/sdgfhjksdfjklNBmnfgkKLHjkqwtuHJBhAFSDGjkhY UgqwerasdjhPhjasfdglkNBhbqwebmznxcbvnmadshfgqw237461234iuy7thjg/WIN-BU GSFIX.exe I've not been able to obtain copy of the binary to figure out what it does. This does mean the worm has a dynamic components that may change its behavior any time the binary is changed and a new one downloaded. The worm then changes a number of registry keys to run the downloaded binary and to clean up after itself. HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run\WIN-B UGSFIX HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Start Page about:blank The worm then creates an HTML file that helps it spread, LOVE-LETTER-FOR-YOU.HTM. This is the file DCC'ed to others on IRC. The worm then spreads to all addresses in the Windows Address Book by sending the file LOVE-LETTER-FOR-YOU.TXT.vbs as an attachment. The email starts: kindly check the attached LOVELETTER coming from me. Then the virus searches for attached drives looking for files with certain extensions. It overwrites files ending with vbs, and vbe. It overwrites files ending with js, jse, css, wsh, sct, and hta, and then renames them to end with vbs. It overwrites files ending with jpg and jpeg and appends .vbs to their name. It finds files with the name mp3 and mp3, creates vbs files with the same name and sets the hidden attribute in the original mp* files. The it looks for the mIRC windows IRC client and overwrites the script.ini file if found. It modifies this file to that it will DCC the LOVE-LETTER-FOR-YOU.HTM file to any people that join a channel the client is in. You can find the source of the worm at: http://www.securityfocus.com/templates/archive.pike?list=82&msg=391184 [log in to unmask]&part=.1 -- Elias Levy SecurityFocus.com http://www.securityfocus.com/ Si vis pacem, para bellum ----------------------------------------------- Matthias Mansfeld Elektronik * Leiterplattenlayout, Bestueckung Am Langhoelzl 11, 85540 Haar; Tel.: 089/4620 093-7, Fax: -8 Internet: http://www.mansfeld-elektronik.de ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################