Mimail.C Worm Radar Alert LEVEL 2 NAME: Mimail.C ALIAS: I-Worm.Mimail.c, W32/Mimail.C@mm, Mimail.C Worm_Mimail.C, W32/Mimail-C, Mimail.C, I-Worm.Mimail.c, Bics, I-Worm.WatchNet Summary Mimail.C worm was first found on 31st of October, 2003. The worm spreads in e-mails as a ZIP archive that contains the worm's executable with PHOTOS.JPG.EXE name. The worm tries to perform a DoS (Denial of Service) attack on certain sites and to steal information from infected computer users. Detailed Description The worm's file is a PE executable 12832 bytes long packed with UPX file compressor. The unpacked file's size is 28192 bytes. Installation to system When the worm's file is run, it registers itself as a service process and becomes invisible in Task List on Windows 9x systems. The the worm copies itself as NETWATCH.EXE file to Windows directory and creates a startup key for this file in System Registry: [HKLM\Software\Microsoft\Windows\CurrentVersion\Run] "NetWatch32" = "%windir%\netwatch.exe" where %windir% is Windows directory name. Then the worm deletes the following files from Windows folder if they are present: zip.tmp exe.tmp eml.tmp After that the worm copies its file to Windows directory as EXE.TMP and creates a ZIP archive with the name ZIP.TMP. This ZIP archive contains the worm's copy with PHOTOS.JPG.EXE name. The worm activates its payload and spreading theads if it can resolve the 'www.google.com' address. Spreading in e-mails The worm spreads in e-mails as a ZIP archive that contains the worm's executable with the PHOTOS.JPG.EXE name. The worm fakes the sender's e-mail address by composing it from 'james@' and the domain name of a recipient. An infected message looks like that: From: james@recipient_domain_name Subject: Re: our private photos <some random characters> Body: Hello Dear!, Finally i've found possibility to right u, my lovely girl :) All our photos which i've made at the beach (even when u're without ur bh:)) photos are great! This evening i'll come and we'll make the best SEX :) Right now enjoy the photos. Kiss, James. <some random characters> Attachment: photos.zip The worm does not use any exploits to make its file start automatically on a recipient's system. The worm will infect a recipient's computer only when he/she unpacks the executable file from the archive and runs it. To collect victim's e-mail addresses the worm scans all files on a hard drive except those with the following extensions: bmp jpg gif exe dll avi mpg mp3 vxd ocx psd tif zip rar pdf cab wav com The addresses are saved into the EML.TMP file located in Windows directory. The worm tries to contact the recipient's SMTP server directly. For this purpose it tries to resolve the current user's DNS server and search for SMTP server info for recipient's domain. Payload The worm tries to perform a DoS (Denial of Service) attack on the following sites: darkprofits.com darkprofits.net www.darkprofits.com www.darkprofits.net If the worm is widespread these sites may go down due to huge traffic amount generated by the worm. Additionally the worm checks foreground windows and if it locates a window belonging to the certain application, the worm collects certain information from it and saves it to C:\TMPE.TMP file. Then this file is sent to e-mail addresses that are stored in an encrypted form in the worm's body. From; F-SECURE http://www.europe.f-secure.com/v-descs/bics.shtml#details See also; Kaspersky: http://www.viruslist.com/eng/index.html?tnews=1001&id=324533 Panda; http://www.pandasoftware.com/virus_info/encyclopedia/overview.aspx?idvirus=41 539 Symantc; http://securityresponse.symantec.com/avcenter/venc/data/w32.mimail.c@xxxxxxx Trend; http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=WORM_MIMAIL.C Mike ~ It is a good day if I learned something new. Editor MikesWhatsNews see a sample on my web page http://www.mwn.ca/ UPDATED 30/10/03 See my Anti-Virus pages UPDATED 31/10/03 <http://www3.telus.net/mikebike/mikes_virus_page.htm> <virusinfo-request@xxxxxxxxxxxxx?Subject=subscribe> A Technical Support Alliance Charter Member For a web-based membership management utility and information on list policies, please see http://nibec.com/24hoursupport/ To unsubscribe, send a blank email to 24hoursupport-request@xxxxxxxxxxxxx with "unsubscribe" (without quotes) in the subject.