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Win32.Bagle.W@mm

First posted on 21 November 2011.
Source: BitDefender

Aliases :

Win32.Bagle.W@mm is also known as TrojanProxy.Win32.Mitglieder.ag, I-Worm.Bagle.u, (KAV.

Explanation :

Although it appears to have been written in Assembler, this worm (like its previous versions) makes intelligent use of advanced Windows functions such as Structured Storage that simplify its code and make it rather elegant. The worm was linked with Visual Studio's linker and packed with UPX.

It uses the backdoor installed by a previous version (Win32.Bagle.U@mm) on port 4751 to infect computers that are infected with that version. Although it provides some sort of SMTP relay, it does not send emails with its body (it is not a mass-mailer).

When run, it checks the command line for the "-del" and "-upd" arguments; "-del" uninstalls the worm and terminates the execution; "-upd" uninstalls the worm and continues the execution (this switch is used for updating).

A mutex called "imain_mutex" is used to specify/check that the virus is running.

It drops two DLL files (iinj4.exe and system.exe) in the Windows System folder; it injects the DLL iinj4.exe in the process whose thread created the window "Shell_TrayWnd" (the Explorer process); this DLL will load a few system DLL's and then load the DLL system.exe, which contains the actual worm. (Although iinj4.exe and system.exe have the .exe extension, they are actually DLL's).

The registry entry HKCUSoftwareDateTimeuid is initialized to a sring of 9 random non-zero digits; the registry entry HKCUSoftwareMicrosoftWindowsCurrentVersion
unssgrate.exe is created to run irun4.exe (from the Windows System folder) at start-up; the registry entry HKCUSoftwareDateTimeport is initialized to a random number in the range 2000 to 49999 that will be used as the port to bind the backdoor to.

The registrry entry HKCUSoftwareDateTimelnei is created when the virus is run for the second time; the presence of this entry will determine scanning the network for older versions and updating them.

A thread is created that will look (every 0.1 seconds) for processes whose names include strings from the list below, and terminate them.

OUTPOST.EXE
NMAIN.EXE
NORTON_INTERNET_SECU_3.0_407.EXE
NPF40_TW_98_NT_ME_2K.EXE
NPFMESSENGER.EXE
NPROTECT.EXE
NSCHED32.EXE
NTVDM.EXE
NVARCH16.EXE
KERIO-WRP-421-EN-WIN.EXE
KILLPROCESSSETUP161.EXE
LDPRO.EXE
LOCALNET.EXE
LOCKDOWN.EXE
LOCKDOWN2000.EXE
LSETUP.EXE
CLEANPC.EXE
AVprotect9x.exe
CMGRDIAN.EXE
CMON016.EXE
CPF9X206.EXE
CPFNT206.EXE
CV.EXE
CWNB181.EXE
CWNTDWMO.EXE
ICSSUPPNT.EXE
DEFWATCH.EXE
DEPUTY.EXE
DPF.EXE
DPFSETUP.EXE
DRWATSON.EXE
ENT.EXE
ESCANH95.EXE
AVXQUAR.EXE
ESCANHNT.EXE
ESCANV95.EXE
AVPUPD.EXE
EXANTIVIRUS-CNET.EXE
FAST.EXE
FIREWALL.EXE
FLOWPROTECTOR.EXE
FP-WIN_TRIAL.EXE
FRW.EXE
FSAV.EXE
AUTODOWN.EXE
FSAV530STBYB.EXE
FSAV530WTBYB.EXE
FSAV95.EXE
GBMENU.EXE
GBPOLL.EXE
GUARD.EXE
GUARDDOG.EXE
HACKTRACERSETUP.EXE
HTLOG.EXE
HWPE.EXE
IAMAPP.EXE
IAMAPP.EXE
IAMSERV.EXE
ICLOAD95.EXE
ICLOADNT.EXE
ICMON.EXE
ICSUPP95.EXE
ICSUPPNT.EXE
IFW2000.EXE
IPARMOR.EXE
IRIS.EXE
JAMMER.EXE
ATUPDATER.EXE
AUPDATE.EXE
KAVLITE40ENG.EXE
KAVPERS40ENG.EXE
KERIO-PF-213-EN-WIN.EXE
KERIO-WRL-421-EN-WIN.EXE
BORG2.EXE
BS120.EXE
CDP.EXE
CFGWIZ.EXE
CFIADMIN.EXE
CFIAUDIT.EXE
AUTOUPDATE.EXE
CFINET.EXE
NAVAPW32.EXE
NAVDX.EXE
NAVSTUB.EXE
NAVW32.EXE
NC2000.EXE
NCINST4.EXE
AUTOTRACE.EXE
NDD32.EXE
NEOMONITOR.EXE
NETARMOR.EXE
NETINFO.EXE
NETMON.EXE
NETSCANPRO.EXE
NETSPYHUNTER-1.2.EXE
NETSTAT.EXE
NISSERV.EXE
NISUM.EXE
CFIAUDIT.EXE
LUCOMSERVER.EXE
AGENTSVR.EXE
ANTI-TROJAN.EXE
ANTI-TROJAN.EXE
ANTIVIRUS.EXE
ANTS.EXE
APIMONITOR.EXE
APLICA32.EXE
APVXDWIN.EXE
ATCON.EXE
ATGUARD.EXE
ATRO55EN.EXE
ATWATCH.EXE
AVCONSOL.EXE
AVGSERV9.EXE
AVSYNMGR.EXE
BD_PROFESSIONAL.EXE
BIDEF.EXE
BIDSERVER.EXE
BIPCP.EXE
BIPCPEVALSETUP.EXE
BISP.EXE
BLACKD.EXE
BLACKICE.EXE
BOOTWARN.EXE
NWINST4.EXE
NWTOOL16.EXE
OSTRONET.EXE
OUTPOSTINSTALL.EXE
OUTPOSTPROINSTALL.EXE
PADMIN.EXE
PANIXK.EXE
PAVPROXY.EXE
DRWEBUPW.EXE
PCC2002S902.EXE
PCC2K_76_1436.EXE
PCCIOMON.EXE
PCDSETUP.EXE
PCFWALLICON.EXE
PCFWALLICON.EXE
PCIP10117_0.EXE
PDSETUP.EXE
PERISCOPE.EXE
PERSFW.EXE
PF2.EXE
AVLTMAIN.EXE
PFWADMIN.EXE
PINGSCAN.EXE
PLATIN.EXE
POPROXY.EXE
POPSCAN.EXE
PORTDETECTIVE.EXE
PPINUPDT.EXE
PPTBC.EXE
PPVSTOP.EXE
PROCEXPLORERV1.0.EXE
PROPORT.EXE
PROTECTX.EXE
PSPF.EXE
WGFE95.EXE
WHOSWATCHINGME.EXE
AVWUPD32.EXE
NUPGRADE.EXE
WHOSWATCHINGME.EXE
WINRECON.EXE
WNT.EXE
WRADMIN.EXE
WRCTRL.EXE
WSBGATE.EXE
WYVERNWORKSFIREWALL.EXE
XPF202EN.EXE
ZAPRO.EXE
ZAPSETUP3001.EXE
ZATUTOR.EXE
CFINET32.EXE
CLEAN.EXE
CLEANER.EXE
CLEANER3.EXE
CLEANPC.EXE
CMGRDIAN.EXE
CMON016.EXE
CPD.EXE
CFGWIZ.EXE
CFIADMIN.EXE
PURGE.EXE
PVIEW95.EXE
QCONSOLE.EXE
QSERVER.EXE
RAV8WIN32ENG.EXE
REGEDT32.EXE
REGEDIT.EXE
UPDATE.EXE
RESCUE.EXE
RESCUE32.EXE
RRGUARD.EXE
RSHELL.EXE
RTVSCN95.EXE
RULAUNCH.EXE
SAFEWEB.EXE
SBSERV.EXE
SD.EXE
SETUP_FLOWPROTECTOR_US.EXE
SETUPVAMEEVAL.EXE
SFC.EXE
SGSSFW32.EXE
SH.EXE
SHELLSPYINSTALL.EXE
SHN.EXE
SMC.EXE
SOFI.EXE
SPF.EXE
SPHINX.EXE
SPYXX.EXE
SS3EDIT.EXE
ST2.EXE
SUPFTRL.EXE
LUALL.EXE
SUPPORTER5.EXE
SYMPROXYSVC.EXE
SYSEDIT.EXE
TASKMON.EXE
TAUMON.EXE
TAUSCAN.EXE
TC.EXE
TCA.EXE
TCM.EXE
TDS2-98.EXE
TDS2-NT.EXE
TDS-3.EXE
TFAK5.EXE
TGBOB.EXE
TITANIN.EXE
TITANINXP.EXE
TRACERT.EXE
TRJSCAN.EXE
TRJSETUP.EXE
TROJANTRAP3.EXE
UNDOBOOT.EXE
VBCMSERV.EXE
VBCONS.EXE
VBUST.EXE
VBWIN9X.EXE
VBWINNTW.EXE
VCSETUP.EXE
VFSETUP.EXE
VIRUSMDPERSONALFIREWALL.EXE
VNLAN300.EXE
VNPC3000.EXE
VPC42.EXE
VPFW30S.EXE
VPTRAY.EXE
VSCENU6.02D30.EXE
VSECOMR.EXE
VSHWIN32.EXE
VSISETUP.EXE
VSMAIN.EXE
VSMON.EXE
VSSTAT.EXE
VSWIN9XE.EXE
VSWINNTSE.EXE
VSWINPERSE.EXE
W32DSM89.EXE
W9X.EXE
WATCHDOG.EXE
WEBSCANX.EXE
CFIAUDIT.EXE
CFINET.EXE
ICSUPP95.EXE
MCUPDATE.EXE
CFINET32.EXE
CLEAN.EXE
CLEANER.EXE
LUINIT.EXE
MCAGENT.EXE
MCUPDATE.EXE
MFW2EN.EXE
MFWENG3.02D30.EXE
MGUI.EXE
MINILOG.EXE
MOOLIVE.EXE
MRFLUX.EXE
MSCONFIG.EXE
MSINFO32.EXE
MSSMMC32.EXE
MU0311AD.EXE
NAV80TRY.EXE
ZAUINST.EXE
ZONALM2601.EXE
ZONEALARM.EXE

Another thread will wait for the computer to connect to the Internet and (after 1 minute) will communicate the "port" and "uid" variables to the following web locations (every 320 minutes; the HTTP agent name used is "i_am_ideal"):

http://www.lowenbrau.ru/manager_old/images/ngr2.php
http://www.ctn.ru/marketing/images/ngr2.php
http://alfinternational.ru/old/oli-lack_katalog/ngr2.php
http://www.psnr.ru/rus/images/banners/ngr2.php
http://www.gasterixx.de/gfx/ngr2.php
http://www.deadlygames.de/DG/BF/BF-Links/clans/ngr2.php
http://www.o-problemo.de/gaestebuch/ngr2.php
http://www.tv87.de/subdomain_la/Fachwart/ngr2.php
http://www.ranknet.de/LVS/pics/_notes/ngr2.php
http://www.joerrens.de/system/include/crc.php
http://www.bbszene.de/store/images/video_amazon/ngr2.php
http://www.gebr-wachs.de/mod/san_beratung/thumb/ngr2.php
http://www.lords-of-havoc.de/Avatare/ngr2.php
http://comdat.de/kreta/ngr2.php
http://www.eurostretch.ru/ngr2.php
http://mir-auto.ru/ngr2.php
http://artesproduction.com/ngr2.php
http://www.hhc-online.de/home/links/pics/ngr2.php
http://gaz-service.ru/img/pict/ngr2.php
http://rdwufa.ru/img/pict/ngr5.php
http://www.komandor.ru/sessions/ngr2.php
http://www.mirage.ru/sport/omega/pic/omega/ngr3.php
http://prizmapr.ru/test/images/ngr2.php
http://avistrade.ru/prog/img/proizvod/ngr2.php
http://service6.valuehost.ru/images/ngr2.php
http://www.thomas-we.de/Design/ngr2.php
http://partiyazerna.1gb.ru/menu/analitika/ngr2.php
http://pvcps.ru/images/ngr2.php
http://monomah-city.ru/vakans/ngr2.php
http://mir-vesov.ru/p/lang/CVS/ngr2.php
http://promco.ru/sovrem/panorama/ngr2.php
http://www.13tw22rigobert.de/_themes/kopie-von-fantasie-in-blau/ngr2.php
http://die-cliquee.de/inhalt/mitglieder/foto/ngr2.php

If the entry HKCUSoftwareDateTimelnei entry has been found in the registry, a thread is created that will scan the network for port 4751 open and update the older Bagle version running on those computers with this version. IP's near the local machine's IP are used every 5 iterations of the loop (20% of the time); for the other 80% of iterations, random IP's are used (a.b.c.d, where a, b, c and d are all in the range 0 to 239).

Before starting the backdoor, a "ban list" is downloaded from the following URL's to ban_list.txt in the Windows System folder:

http://www.lowenbrau.ru/manager_old/images/banlist.php
http://comdat.de/kreta/banlist.php
http://www.psnr.ru/rus/images/banners/banlist.php
http://gaz-service.ru/img/pict/banlist.php
http://rdwufa.ru/img/pict/banlist.php
http://prizmapr.ru/test/images/banlist.php
http://avistrade.ru/prog/img/proizvod/banlist.php
http://service6.valuehost.ru/images/banlist.php
http://www.thomas-we.de/Design/banlist.php
http://partiyazerna.1gb.ru/menu/analitika/banlist.php
http://pvcps.ru/images/banlist.php
http://monomah-city.ru/vakans/banlist.php
http://mir-vesov.ru/p/lang/CVS/banlist.php
http://promco.ru/sovrem/panorama/ngr2.php
http://www.13tw22rigobert.de/_themes/kopie-von-fantasie-in-blau/banlist.php
http://die-cliquee.de/inhalt/mitglieder/foto/banlist.php

This ban list can specify IP's and IP ranges that the backdoor refuses connections to.

The backdoor is run on the random TCP "port" chosen before. Based on data exchanged with the client, it can do the following:

- bind the backdoor to a different port;
- udpate itself (the client uploads an executable which is dropped to the Windows folder using the name "iuplday and z>.exe" and is run with the "-upd" switch);
- uninstall the worm;
- act as an email relay; received emails will be sent to the recipient's DNS-resolved SMTP server; the user's configured DNS server or the hardcoded 217.5.97.137 DNS server is used;
- run a command specified by the client;
- download a file from a specified Internet location (to "iuplda.exe" in the Windows folder) and run it;
- act as a proxy.

Last update 21 November 2011

 

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