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Win32.Bagle.AY@mm

MEDIUM
LOW
~23000 bytes
(Win32.Bagle.AY@mm;Win32.Bagle-gen)

Symptoms

The presence of the following registry key:
HKCU\Software\Microsoft\Windows\CurrentVersion\Run\sysformat = %sysdir%\sysformat.exe

The presence of the following files:
%sysdir%\sysformat.exe
%sysdir%\sysformat.exeopen

Usually %sysdir% is C:\Windows\System32

Removal instructions:

Automatic desinfection: Let BitDefender delete all files it finds infected.
Manual removal: use Task Manager to kill the process "sysformat", then delete the files and registry keys listed in the "Symptoms" category.

Analyzed By

Daniel Ionita

Technical Description:

The virus is almost the same as Win32.Bagle.AX@mm, with few changes. It comes packed with PEX and is ~23000 bytes in size packed and about ~69000 bytes unpacked.

At runtime, it drops the files sysformat.exe and sysformat.exeopen in the %sysdir% folder. The file  "sysformat.exeopen" is the attachement used in the mails that the virus will send. Usually it's different than sysformat.exe, because it has random garbage bytes appended at the end (that's why the size is variable).

It creates a mutex with the name:

MuXxXxTENYKSDesignedAsTheFollowerOfSkynet-D

It deletes the following registry entry (if exists):
{HKCU-HKLM}\Software\Microsoft\Windows\CurrentVersion\Run\"My AV"

It adds the following registry keys:
HKCU\Software\Microsoft\Windows\CurrentVersion\Run\sysformat = %sysdir%\sysformat.exe

It then creates a mail, choosing randomly from a list of predefined mail parts:
From: (spoofed)

Subject:
Delivery service mail
Delivery by mail
Registration is accepted
Is delivered mail
You are made active

Body:
Thanks for use of our software.
Before use read the help

Attachement name:
wsd01
viupd02
siupd02
guupd02
zupd02
upd02
Jol03

To the attachement name, an extension is appended, one of the following:
.exe
.scr
.com
.cpl

The virus will not send mails to addresses that contain one of the following:
@microsoft
rating@
f-secur
news
update
anyone@
bugs@
contract@
feste
gold-certs@
help@
info@
nobody@
noone@
kasp
admin
icrosoft
support
ntivi
unix
linux
listserv
certific
sopho
@foo
@iana
free-av
@messagelab
winzip
google
winrar
samples
abuse
panda
cafee
spam
@avp.
noreply
local
root@
postmaster@

The virus will search for email addresses in all files with the extension:
.wab
.txt
.msg
.htm
.shtm
.stm
.xml
.dbx
.mbx
.mdx
.eml
.nch
.mmf
.ods
.cfg
.asp
.php
.wsh
.adb
.tbb
.sht
.xls
.oft
.uin
.cgi
.mht
.dhtm
.jsp

It has some P2P spreading capabilities, the same it uses since early versions: it searches folders that contain the string "shar" and copies itself there under the following names:

1.exe
2.exe
3.exe
4.exe
5.scr
6.exe
7.exe
8.exe
9.exe
10.exe
Ahead Nero 7.exe
Windown Longhorn Beta Leak.exe
Opera 8 New!.exe
XXX hardcore images.exe
WinAmp 6 New!.exe
WinAmp 5 Pro Keygen Crack Update.exe
Adobe Photoshop 9 full.exe
Matrix 3 Revolution English Subtitles.exe
ACDSee 9.exe

The virus will kill the following processes, if found active (the majority are antivirus processes):
mcagent.exe
mcvsshld.exe
mcshield.exe
mcvsescn.exe
mcvsrte.exe
DefWatch.exe
Rtvscan.exe
ccEvtMgr.exe
NISUM.EXE
ccPxySvc.exe
navapsvc.exe
NPROTECT.EXE
nopdb.exe
ccApp.exe
Avsynmgr.exe
VsStat.exe
Vshwin32.exe
alogserv.exe
RuLaunch.exe
Avconsol.exe
PavFires.exe
FIREWALL.EXE
ATUPDATER.EXE
LUALL.EXE
DRWEBUPW.EXE
AUTODOWN.EXE
NUPGRADE.EXE
OUTPOST.EXE
ICSSUPPNT.EXE
ICSUPP95.EXE
ESCANH95.EXE
AVXQUAR.EXE
ESCANHNT.EXE
ATUPDATER.EXE
AUPDATE.EXE
AUTOTRACE.EXE
AUTOUPDATE.EXE
AVXQUAR.EXE
AVWUPD32.EXE
AVPUPD.EXE
CFIAUDIT.EXE
UPDATE.EXE
NUPGRADE.EXE
MCUPDATE.EXE
pavsrv50.exe
AVENGINE.EXE
APVXDWIN.EXE
pavProxy.exe
navapw32.exe
navapsvc.exe
ccProxy.exe
navapsvc.exe
NPROTECT.EXE
SAVScan.exe
SNDSrvc.exe
symlcsvc.exe
LUCOMS~1.EXE
blackd.exe
bawindo.exe
FrameworkService.exe
VsTskMgr.exe
SHSTAT.EXE
UpdaterUI.exe

The virus will at last try to download one file from the following addresses:


http://www.pyrlandia-boogie.pl/
http://www.kps4parents.com/
http://www.pipni.cz/
http://www.selu.edu/
http://www.travelchronic.de/
http://www.fleigutaetscher.ch/
http://www.irakli.org/
http://www.oboe-online.com/
http://www.oboe-online.com/
http://www.pe-sh.com/
http://www.idb-group.net/
http://www.ceskyhosting.cz/
http://www.ceskyhosting.cz/
http://www.hartacorporation.com/
http://www.glass.la/
http://www.glass.la/
http://www.24-7-transportation.com/
http://www.fepese.ufsc.br/
http://www.ellarouge.com.au/
http://www.bbsh.org/
http://www.boneheadmusic.com/
http://www.sljinc.com/
http://www.tivogoddess.com/
http://www.fcpages.com/
http://www.szantomierz.art.pl/
http://www.elenalazar.com/
http://www.generationnow.net/
http://www.flashcorp.com/
http://www.kencorbett.com/
http://www.FritoPie.NET/
http://www.leonhendrix.com/
http://www.transportation.gov.bh/
http://www.transportation.gov.bh/
http://www.jhaforpresident.7p.com/
http://www.DarrkSydebaby.com/
http://www.cntv.info/
http://www.sugardas.lt/
http://www.adhdtests.com/
http://www.argontech.net/
http://www.customloyal.com/
http://www.ohiolimo.com/
http://www.topko.sk/
http://www.ssmifc.ca/
http://www.reliance-yachts.com/
http://www.worest.com.ar/
http://www.kps4parents.com/
http://www.coolfreepages.com/
http://www.scanex-medical.fi/
http://www.jimvann.com/
http://www.orari.net/
http://www.himpsi.org/
http://www.mtfdesign.com/
http://www.jldr.ca/
http://www.relocationflorida.com/
http://www.rentalstation.com/
http://www.approved1stmortgage.com/
http://www.velezcourtesymanagement.com/
http://www.sunassetholdings.com/
http://www.compsolutionstore.com/
http://www.uhcc.com/
http://www.justrepublicans.com/
http://www.pfadfinder-leobersdorf.com/
http://www.featech.com/
http://www.vinirforge.com/
http://www.magicbottle.com.tw/
http://www.giantrevenue.com/
http://www.couponcapital.net/
http://www.crystalrose.ca/
http://www.bottombouncer.com/
http://www.anthonyflanagan.com/
http://www.bradster.com/
http://www.traverse.com/
http://www.ims-i.com/
http://www.realgps.com/
http://www.aviation-center.de/
http://www.gci-bln.de/
http://www.pankration.com/
http://www.jansenboiler.com/
http://www.corpsite.com/
http://www.everett.wednet.edu/
http://www.onepositiveplace.org/
http://www.raecoinc.com/
http://www.wwwebad.com/
http://www.corpsite.com/
http://www.wwwebmaster.com/
http://www.wwwebad.com/
http://www.dragcar.com/
http://www.wwwebad.com/
http://www.oohlala-kirkland.com/
http://www.calderwoodinn.com/
http://www.buddyboymusic.com/
http://www.smacgreetings.com/
http://www.tkd2xcell.com/
http://www.curtmarsh.com/
http://www.dontbeaweekendparent.com/
http://www.soloconsulting.com/
http://www.lasermach.com/
http://www.alupass.lu/
http://www.sigi.lu/
http://www.redlightpictures.com/
http://www.irinaswelt.de/
http://www.bueroservice-it.de/
http://www.kranenberg.de/
http://www.kranenberg.de/
http://www.the-fabulous-lions.de/
http://www.the-fabulous-lions.de/
http://www.mongolische-renner.de/
http://www.mongolische-renner.de/
http://www.capri-frames.de/
http://www.capri-frames.de/
http://www.aimcenter.net/
http://www.boneheadmusic.com/
http://www.fludir.is/
http://www.sljinc.com/
http://www.tivogoddess.com/
http://www.fcpages.com/
http://www.andara.com/
http://www.freeservers.com/
http://www.programmierung2000.de/
http://www.asianfestival.nl/
http://www.aviation-center.de/
http://www.gci-bln.de/
http://www.mass-i.kiev.ua/
http://www.jasnet.pl/
http://www.atlantisteste.hpg.com.br/
http://www.fludir.is/
http://www.rieraquadros.com.br/
http://www.metal.pl/
http://www.handsforhealth.com/
http://www.angelartsanctuary.com/
http://www.firstnightoceancounty.org/
http://www.chinasenfa.com/
http://www.chinasenfa.com/
http://www.ulpiano.org/
http://www.gamp.pl/
http://www.vikingpc.pl/
http://www.woundedshepherds.com/
http://www.cpc.adv.br/
http://www.velocityprint.com/
http://www.esperanzaparalafamilia.com/
http://www.celula.com.mx/
http://www.mexis.com/
http://www.wecompete.com/
http://www.vbw.info/
http://www.gfn.org/
http://www.aegee.org/
http://www.deadrobot.com/
http://www.cscliberec.cz/
http://www.ecofotos.com.br/
http://www.amanit.ru/
http://www.bga-gsm.ru/
http://www.innnewport.com/
http://www.knicks.nl/
http://www.srg-neuburg.de/
http://www.mepmh.de/
http://www.mepbisu.de/
http://www.kradtraining.de/
http://www.polizeimotorrad.de/
http://www.sea.bz.it/
http://www.uslungiarue.it/
http://www.gcnet.ru/
http://www.aimcenter.net/
http://www.vandermost.de/
http://www.vandermost.de/
http://www.szantomierz.art.pl/
http://www.immonaut.sk/
http://www.eurostavba.sk/
http://www.spadochron.pl/

The virus will not send mails after the date 25.04.2006.