TROJ_FAKEAV.CLS
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
It terminates itself if any of the specific condition is met.
This routine is done by the malware to avoid analysis tools, sandboxes, virtual machines, and security applications.
It also creates specific registry entry to enable automatic execution of the downloaded file.
This Trojan may be unknowingly downloaded by a user while visiting malicious websites.
As of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
98,304 bytes
EXE
UPX
Yes
25 Jul 2011
Arrival Details
This Trojan may be unknowingly downloaded by a user while visiting malicious websites.
Installation
This Trojan adds the following folders:
- %System Root%\Documents and Settings\All Users\Application Data\{random characters}
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
It adds the following mutexes to ensure that only one of its copies runs at any one time:
- Virus1Doctor1Installer1Mutex1
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
VDC = %User Temp%\{malware file name}.exe {parameter}
Other System Modifications
This Trojan adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Image File Execution Options\
{application name}
Debugger = svchost.exe
Where {application name} may be any of the following:
- AAWTray.exe
- AVENGINE.EXE
- Ad-Aware.exe
- AluSchedulerSvc.exe
- MPFSrv.exe
- MSASCui.exe
- McSACore.exe
- PavFnSvr.exe
- PsCtrls.exe
- PsImSvc.exe
- PskSvc.exe
- TPSrv.exe
- WebProxy.exe
- _avp32.exe
- _avpcc.exe
- _avpm.exe
- aAvgApi.exe
- ackwin32.exe
- adaware.exe
- advxdwin.exe
- agentsvr.exe
- agentw.exe
- alertsvc.exe
- alevir.exe
- alogserv.exe
- amon9x.exe
- anti-trojan.exe
- antivirus.exe
- ants.exe
- apimonitor.exe
- aplica32.exe
- apvxdwin.exe
- arr.exe
- ashDisp.exe
- atcon.exe
- atguard.exe
- atro55en.exe
- atupdater.exe
- atwatch.exe
- au.exe
- aupdate.exe
- auto-protect.nav80try.exe
- autodown.exe
- autotrace.exe
- autoupdate.exe
- avcenter.exe
- avciman.exe
- avconsol.exe
- ave32.exe
- avgcc32.exe
- avgctrl.exe
- avgemc.exe
- avgnt.exe
- avgrsx.exe
- avgserv.exe
- avgserv9.exe
- avgtray.exe
- avguard.exe
- avgui.exe
- avgw.exe
- avkpop.exe
- avkserv.exe
- avkservice.exe
- avkwctl9.exe
- avltmain.exe
- avnt.exe
- avp.exe
- avp32.exe
- avpcc.exe
- avpdos32.exe
- avpm.exe
- avptc32.exe
- avpupd.exe
- avsched32.exe
- avsynmgr.exe
- avwin.exe
- avwin95.exe
- avwinnt.exe
- avwupd.exe
- avwupd32.exe
- avwupsrv.exe
- avxmonitor9x.exe
- avxmonitornt.exe
- avxquar.exe
- backweb.exe
- bargains.exe
- bd_professional.exe
- bdagent.exe
- bdmcon.exe
- beagle.exe
- belt.exe
- bidef.exe
- bidserver.exe
- bipcp.exe
- bipcpevalsetup.exe
- bisp.exe
- blackd.exe
- blackice.exe
- blink.exe
- blss.exe
- bootconf.exe
- bootwarn.exe
- borg2.exe
- bpc.exe
- brasil.exe
- bs120.exe
- bundle.exe
- bvt.exe
- ccSvcHst.exe
- ccapp.exe
- ccevtmgr.exe
- ccpxysvc.exe
- cdp.exe
- cfd.exe
- cfgwiz.exe
- cfiadmin.exe
- cfiaudit.exe
- cfinet.exe
- cfinet32.exe
- claw95.exe
- claw95cf.exe
- clean.exe
- cleaner.exe
- cleaner3.exe
- cleanpc.exe
- click.exe
- cmd32.exe
- cmesys.exe
- cmgrdian.exe
- cmon016.exe
- connectionmonitor.exe
- cpd.exe
- cpf9x206.exe
- cpfnt206.exe
- ctrl.exe
- cv.exe
- cwnb181.exe
- cwntdwmo.exe
- datemanager.exe
- dcomx.exe
- defalert.exe
- defscangui.exe
- defwatch.exe
- deputy.exe
- divx.exe
- dllcache.exe
- dllreg.exe
- doors.exe
- dpf.exe
- dpfsetup.exe
- dpps2.exe
- drwatson.exe
- drweb32.exe
- drwebupw.exe
- dssagent.exe
- dvp95.exe
- dvp95_0.exe
- ecengine.exe
- efpeadm.exe
- egui.exe
- ekrn.exe
- emsw.exe
- ent.exe
- esafe.exe
- escanhnt.exe
- escanv95.exe
- espwatch.exe
- ethereal.exe
- etrustcipe.exe
- evpn.exe
- exantivirus-cnet.exe
- exe.avxw.exe
- expert.exe
- explore.exe
- f-agnt95.exe
- f-prot.exe
- f-prot95.exe
- f-stopw.exe
- fameh32.exe
- fast.exe
- fch32.exe
- fih32.exe
- findviru.exe
- firewall.exe
- fnrb32.exe
- fp-win.exe
- fp-win_trial.exe
- fprot.exe
- frw.exe
- fsaa.exe
- fsav.exe
- fsav32.exe
- fsav530stbyb.exe
- fsav530wtbyb.exe
- fsav95.exe
- fsgk32.exe
- fsm32.exe
- fsma32.exe
- fsmb32.exe
- gator.exe
- gbmenu.exe
- gbpoll.exe
- generics.exe
- gmt.exe
- guard.exe
- guarddog.exe
- hacktracersetup.exe
- hbinst.exe
- hbsrv.exe
- hotactio.exe
- hotpatch.exe
- htlog.exe
- htpatch.exe
- hwpe.exe
- hxdl.exe
- hxiul.exe
- iamapp.exe
- iamserv.exe
- iamstats.exe
- ibmasn.exe
- ibmavsp.exe
- icload95.exe
- icloadnt.exe
- icmon.exe
- icsupp95.exe
- icsuppnt.exe
- idle.exe
- iedll.exe
- iedriver.exe
- iface.exe
- ifw2000.exe
- inetlnfo.exe
- infus.exe
- infwin.exe
- init.exe
- intdel.exe
- intren.exe
- iomon98.exe
- istsvc.exe
- jammer.exe
- jdbgmrg.exe
- jedi.exe
- kavlite40eng.exe
- kavpers40eng.exe
- kavpf.exe
- kazza.exe
- keenvalue.exe
- kerio-pf-213-en-win.exe
- kerio-wrl-421-en-win.exe
- kerio-wrp-421-en-win.exe
- killprocesssetup161.exe
- launcher.exe
- ldnetmon.exe
- ldpro.exe
- ldpromenu.exe
- ldscan.exe
- lnetinfo.exe
- loader.exe
- localnet.exe
- lockdown.exe
- lockdown2000.exe
- lookout.exe
- lordpe.exe
- lsetup.exe
- luall.exe
- luau.exe
- lucomserver.exe
- luinit.exe
- luspt.exe
- mapisvc32.exe
- mcagent.exe
- mcmnhdlr.exe
- mcmscsvc.exe
- mcnasvc.exe
- mcproxy.exe
- mcshell.exe
- mcshield.exe
- mcsysmon.exe
- mctool.exe
- mcupdate.exe
- mcvsrte.exe
- mcvsshld.exe
- md.exe
- mfin32.exe
- mfw2en.exe
- mfweng3.02d30.exe
- mgavrtcl.exe
- mgavrte.exe
- mghtml.exe
- mgui.exe
- minilog.exe
- mmod.exe
- monitor.exe
- moolive.exe
- mostat.exe
- mpfagent.exe
- mpfservice.exe
- mpftray.exe
- mrflux.exe
- msapp.exe
- msbb.exe
- msblast.exe
- mscache.exe
- msccn32.exe
- mscman.exe
- msdm.exe
- msdos.exe
- msiexec16.exe
- mslaugh.exe
- msmgt.exe
- msmsgri32.exe
- mssmmc32.exe
- mssys.exe
- msvxd.exe
- mu0311ad.exe
- mwatch.exe
- n32scanw.exe
- nav.exe
- navap.navapsvc.exe
- navapsvc.exe
- navapw32.exe
- navdx.exe
- navlu32.exe
- navnt.exe
- navstub.exe
- navw32.exe
- navwnt.exe
- nc2000.exe
- ncinst4.exe
- ndd32.exe
- neomonitor.exe
- neowatchlog.exe
- netarmor.exe
- netd32.exe
- netinfo.exe
- netmon.exe
- netscanpro.exe
- netspyhunter-1.2.exe
- netutils.exe
- nisserv.exe
- nisum.exe
- nmain.exe
- nod32.exe
- normist.exe
- norton_internet_secu_3.0_407.exe
- notstart.exe
- npf40_tw_98_nt_me_2k.exe
- npfmessenger.exe
- nprotect.exe
- npscheck.exe
- npssvc.exe
- nsched32.exe
- nssys32.exe
- nstask32.exe
- nsupdate.exe
- nt.exe
- ntrtscan.exe
- ntvdm.exe
- ntxconfig.exe
- nui.exe
- nupgrade.exe
- nvarch16.exe
- nvc95.exe
- nvsvc32.exe
- nwinst4.exe
- nwservice.exe
- nwtool16.exe
- ollydbg.exe
- onsrvr.exe
- optimize.exe
- ostronet.exe
- otfix.exe
- outpost.exe
- outpostinstall.exe
- outpostproinstall.exe
- padmin.exe
- panixk.exe
- patch.exe
- pavcl.exe
- pavproxy.exe
- pavprsrv.exe
- pavsched.exe
- pavsrv51.exe
- pavw.exe
- pccwin98.exe
- pcfwallicon.exe
- pcip10117_0.exe
- pcscan.exe
- pdsetup.exe
- periscope.exe
- persfw.exe
- perswf.exe
- pf2.exe
- pfwadmin.exe
- pgmonitr.exe
- pingscan.exe
- platin.exe
- pop3trap.exe
- poproxy.exe
- popscan.exe
- portdetective.exe
- portmonitor.exe
- powerscan.exe
- ppinupdt.exe
- pptbc.exe
- ppvstop.exe
- prizesurfer.exe
- prmt.exe
- prmvr.exe
- procdump.exe
- processmonitor.exe
- procexplorerv1.0.exe
- programauditor.exe
- proport.exe
- protectx.exe
- pspf.exe
- purge.exe
- qconsole.exe
- qserver.exe
- rapapp.exe
- rav7.exe
- rav7win.exe
- rav8win32eng.exe
- ray.exe
- rb32.exe
- rcsync.exe
- realmon.exe
- reged.exe
- regedt32.exe
- rescue.exe
- rescue32.exe
- rrguard.exe
- rshell.exe
- rtvscan.exe
- rtvscn95.exe
- rulaunch.exe
- safeweb.exe
- sahagent.exe
- save.exe
- savenow.exe
- sbserv.exe
- sc.exe
- scam32.exe
- scan32.exe
- scan95.exe
- scanpm.exe
- sched.exe
- scrscan.exe
- serv95.exe
- setup_flowprotector_us.exe
- setupvameeval.exe
- sgssfw32.exe
- sh.exe
- shellspyinstall.exe
- shn.exe
- showbehind.exe
- smc.exe
- sms.exe
- smss32.exe
- soap.exe
- sofi.exe
- sperm.exe
- spf.exe
- sphinx.exe
- spoler.exe
- spoolcv.exe
- spoolsv32.exe
- spyxx.exe
- srexe.exe
- srng.exe
- ss3edit.exe
- ssg_4104.exe
- ssgrate.exe
- st2.exe
- start.exe
- stcloader.exe
- supftrl.exe
- support.exe
- supporter5.exe
- svc.exe
- svchostc.exe
- svchosts.exe
- svshost.exe
- sweep95.exe
- sweepnet.sweepsrv.sys.swnetsup.exe
- symlcsvc.exe
- symproxysvc.exe
- symtray.exe
- system.exe
- system32.exe
- sysupd.exe
- taumon.exe
- tbscan.exe
- tc.exe
- tca.exe
- tcm.exe
- tds-3.exe
- tds2-98.exe
- tds2-nt.exe
- teekids.exe
- tfak.exe
- tfak5.exe
- tgbob.exe
- titanin.exe
- titaninxp.exe
- trickler.exe
- trjscan.exe
- trjsetup.exe
- trojantrap3.exe
- tsadbot.exe
- tvmd.exe
- tvtmd.exe
- undoboot.exe
- updat.exe
- upgrad.exe
- utpost.exe
- vbcmserv.exe
- vbcons.exe
- vbust.exe
- vbwin9x.exe
- vbwinntw.exe
- vcsetup.exe
- vet32.exe
- vet95.exe
- vettray.exe
- vfsetup.exe
- vir-help.exe
- virusmdpersonalfirewall.exe
- vnlan300.exe
- vnpc3000.exe
- vpc32.exe
- vpc42.exe
- vpfw30s.exe
- vptray.exe
- vscan40.exe
- vscenu6.02d30.exe
- vsched.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
- webdav.exe
- webscanx.exe
- webtrap.exe
- wfindv32.exe
- whoswatchingme.exe
- wimmun32.exe
- win-bugsfix.exe
- win32.exe
- win32us.exe
- winactive.exe
- window.exe
- windows.exe
- wininetd.exe
- wininitx.exe
- winlogin.exe
- winmain.exe
- winppr32.exe
- winrecon.exe
- winservn.exe
- winssk32.exe
- winstart.exe
- winstart001.exe
- wintsk32.exe
- winupdate.exe
- wkufind.exe
- wnad.exe
- wnt.exe
- wradmin.exe
- wrctrl.exe
- wsbgate.exe
- wupdater.exe
- wupdt.exe
- wyvernworksfirewall.exe
- xpf202en.exe
- zapro.exe
- zapsetup3001.exe
- zatutor.exe
- zonalm2601.exe
- zonealarm.exe
Download Routine
This Trojan downloads updated copies of itself from the following websites:
- %User Temp%\{malware file name}.exe
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)
It connects to the following website(s) to download and execute a malicious file:
- http://{BLOCKED}7.67.94/index.php?{random string}
- http://{BLOCKED}2.8.98/index.php?{random string}
- http://{BLOCKED}sft.com
It saves the files it downloads using the following names:
- %User Temp%\setup.exe
- %System Root%\Documents and Settings\All Users\Application Data\{random characters}\{random characters}.exe
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.)
As of this writing, the said sites are inaccessible.
NOTES:
This Trojan terminates itself if any of the following conditions is met:
- Its file name is C:\file.exe
- User Name of the logged-in user is CurrentUser
- Computer name of the affected system is Sandbox
- Processor Infomation contains the string VMWARE
- Product ID of the affected system is equal to any of the following:
- 76487-337-8429955-22614
- 76487-644-3177037-23510
- 55274-640-2673064-23950
- Any of the following files is loaded in memory:
- sbiedll.dll
- DBGHELP.DLL
- OLLYDBG
- Any of the registry keys exist in the system:
HKEY_LOCAL_MACHINE\SOFTWARE\Zone Labs\ZoneAlarm
HKEY_LOCAL_MACHINE\SOFTWARE\Eset\Nod
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths\WebrootDesktopFirewall.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Symantec\Norton AntiVirus
HKEY_LOCAL_MACHINE\SOFTWARE\Sophos\SAVService\Application
HKEY_LOCAL_MACHINE\SOFTWARE\rising\Rav
HKEY_LOCAL_MACHINE\SOFTWARE\KasperskyLab\InstalledProducts\Kaspersky Anti-Virus Personal
HKEY_LOCAL_MACHINE\SOFTWARE\Data Fellows\F-Secure
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{E58B329B-FB28-4874-90DE-0D7CB2709267}
HKEY_LOCAL_MACHINE\SOFTWARE\BitDefender\BitDefender Antivirus 2008
HKEY_LOCAL_MACHINE\SOFTWARE\AVG
HKEY_LOCAL_MACHINE\SOFTWARE\ComodoGroup\CDI
HKEY_LOCAL_MACHINE\SOFTWARE\Agnitum\Security Suite
The above mentioned routines are done by the malware to avoid analysis tools, sandboxes, virtual machines, and security applications.
It creates the following registry entry to enable automatic execution of the downloaded file:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
VDC = %System Root%\Documents and Settings\All Users\Application Data\{random characters} {parameter}
SOLUTION
8.900
8.310.02
25 Jul 2011
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Identify and terminate files detected as TROJ_FAKEAV.CLS
- If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
- If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.
Step 3
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
- VDC = %User Temp%\{malware file name}.exe {parameter}
- VDC = %User Temp%\{malware file name}.exe {parameter}
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- VDC = %System Root%\Documents and Settings\All Users\Application Data\{random characters} {parameter}
- VDC = %System Root%\Documents and Settings\All Users\Application Data\{random characters} {parameter}
Step 4
Delete this registry key
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\
- {application name}
Step 5
Search and delete this folder
Step 6
Scan your computer with your Trend Micro product to delete files detected as TROJ_FAKEAV.CLS. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
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