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  3. W32.Sality.X

W32.Sality.X

Risk Level 2: Low

Discovered:
January 12, 2007
Updated:
March 27, 2007 3:54:05 PM
Type:
Virus
Systems Affected:
Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Vista, Windows XP
When the virus is executed, it drops the following files:

The threat also drops the following file, which is a copy of Hacktool.Rootkit:
%System%\drivers\[RANDOM].sys

The virus then appends the following lines to the file %Windir%\System.ini:
[MCIDRV_VER]
DEVICEN1=[RANDOM_NUMBER]

The threat then injects this .dll file into all running processes.

The virus resides in memory and infects all portable executable files it finds.

Next, the threat attempts to connect to the following Web sites:
  • http://www.kukutrustnet666.info
  • http://www.kukutrustnet7.info
  • http://www.kukutrustnet.info
  • http://www.hkukud123ncs.info
  • http://www.h7smcnr1wlsdn34fgv.info
  • http://www.lukki6dnd2kdnc.info
  • http://www.f5ds1jkkk4d.info
  • http://www.g1ikddcvns3sdsal.info
  • http://www.inform1ongung.info
  • http://www.bpfq02.com

The virus ends and deletes services which have the following names:
  • ALG
  • aswUpdSv
  • avast! Antivirus
  • avast! Mail Scanner
  • avast! Web Scanner
  • AVP
  • BackWeb Plug-in - 4476822
  • bdss
  • BGLiveSvc
  • BlackICE
  • CAISafe
  • ccEvtMgr
  • ccProxy
  • ccSetMgr
  • F-Prot Antivirus Update Monitor
  • F-Secure Gatekeeper Handler Starter
  • fsbwsys
  • FSDFWD
  • fshttps
  • FSMA
  • InoRPC
  • InoRT
  • InoTask
  • ISSVC
  • KPF4
  • LavasoftFirewall
  • LIVESRV
  • McAfeeFramework
  • McShield
  • McTaskManager
  • navapsvc
  • NOD32krn
  • NPFMntor
  • NSCService
  • Outpost Firewall main module
  • OutpostFirewall
  • PAVFIRES
  • PAVFNSVR
  • PavProt
  • PavPrSrv
  • PAVSRV
  • PcCtlCom
  • PersonalFirewal
  • PREVSRV
  • ProtoPort Firewall service
  • PSIMSVC
  • RapApp
  • SmcService
  • SNDSrvc
  • SPBBCSvc
  • Symantec Core LC
  • Tmntsrv
  • TmPfw
  • tmproxy
  • UmxAgent
  • UmxCfg
  • UmxLU
  • UmxPol
  • vsmon
  • VSSERV
  • WebrootDesktopFirewallDataService
  • WebrootFirewall
  • XCOMM

The virus also ends processes which have names containing the following strings:
  • _AVPM.
  • A2GUARD.
  • AAVSHIELD.
  • ACKWIN32.
  • ADVCHK.
  • AHNSD.
  • AIRDEFENSE
  • ALERTSVC
  • ALMON.
  • ALOGSERV
  • ALSVC.
  • AMON.
  • ANTI-TROJAN.
  • ANTIVIRSCHEDULER
  • ANTIVIRSERVICE
  • ANTS.
  • APVXDWIN.
  • ARMOR2NET.
  • ASHAVAST.
  • ASHDISP.
  • ASHENHCD.
  • ASHMAISV.
  • ASHPOPWZ.
  • ASHSERV.
  • ASHSIMPL.
  • ASHSKPCK.
  • ASHWEBSV.
  • ASWUPDSV.
  • ATCON.
  • ATUPDATER.
  • ATWATCH.
  • AUPDATE.
  • AUTODOWN.
  • AUTOTRACE.
  • AUTOUPDATE.
  • AVCIMAN.
  • AVCONSOL.
  • AVENGINE.
  • AVGAMSVR.
  • AVGCC.
  • AVGCC32.
  • AVGCTRL.
  • AVGEMC.
  • AVGFWSRV.
  • AVGNT.
  • AVGNTDD
  • AVGNTMGR
  • AVGSERV.
  • AVGUARD.
  • AVGUPSVC.
  • AVINITNT.
  • AVKSERV.
  • AVKSERVICE.
  • AVKWCTL.
  • AVP.
  • AVP32.
  • AVPCC.
  • AVPM.
  • AVPUPD.
  • AVSCHED32.
  • AVSYNMGR.
  • AVWUPD32.
  • AVWUPSRV.
  • AVXMONITOR9X.
  • AVXMONITORNT.
  • AVXQUAR.
  • BACKWEB-4476822.
  • BDMCON.
  • BDNEWS.
  • BDOESRV.
  • BDSS.
  • BDSUBMIT.
  • BDSWITCH.
  • BLACKD.
  • BLACKICE.
  • CAFIX.
  • CCAPP.
  • CCEVTMGR.
  • CCPROXY.
  • CCSETMGR.
  • CFIAUDIT.
  • CLAMTRAY.
  • CLAMWIN.
  • CLAW95.
  • CLAW95CF.
  • CLEANER.
  • CLEANER3.
  • CLISVC.
  • CMGRDIAN.
  • CPD.
  • DEFWATCH.
  • DOORS.
  • DRVIRUS.
  • DRWADINS.
  • DRWEB32W.
  • DRWEBSCD.
  • DRWEBUPW.
  • ESCANH95.
  • ESCANHNT.
  • EWIDOCTRL.
  • EZANTIVIRUSREGISTRATIONCHECK.
  • F-AGNT95.
  • F-PROT95.
  • F-SCHED.
  • F-STOPW.
  • FAMEH32.
  • FAST.
  • FCH32.
  • FILEMON
  • FIRESVC.
  • FIRETRAY.
  • FIREWALL.
  • FPAVUPDM.
  • FRESHCLAM.
  • FRW.
  • FSAV32.
  • FSAVGUI.
  • FSBWSYS.
  • FSDFWD.
  • FSGK32.
  • FSGK32ST.
  • FSGUIEXE.
  • FSM32.
  • FSMA32.
  • FSMB32.
  • FSPEX.
  • FSSM32.
  • GCASDTSERV.
  • GCASSERV.
  • GIANTANTISPYWAREMAIN.
  • GIANTANTISPYWAREUPDATER.
  • GUARDGUI.
  • GUARDNT.
  • HREGMON.
  • HRRES.
  • HSOCKPE.
  • HUPDATE.
  • IAMAPP.
  • IAMSERV.
  • ICLOAD95.
  • ICLOADNT.
  • ICMON.
  • ICSSUPPNT.
  • ICSUPP95.
  • ICSUPPNT.
  • IFACE.
  • INETUPD.
  • INOCIT.
  • INORPC.
  • INORT.
  • INOTASK.
  • INOUPTNG.
  • IOMON98.
  • ISAFE.
  • ISATRAY.
  • ISRV95.
  • ISSVC.
  • KAV.
  • KAVMM.
  • KAVPF.
  • KAVPFW.
  • KAVSTART.
  • KAVSVC.
  • KAVSVCUI.
  • KMAILMON.
  • KPFWSVC.
  • KWATCH.
  • LOCKDOWN2000.
  • LOGWATNT.
  • LUALL.
  • LUCOMSERVER.
  • LUUPDATE.
  • MCAGENT.
  • MCMNHDLR.
  • MCREGWIZ.
  • MCUPDATE.
  • MCVSSHLD.
  • MINILOG.
  • MYAGTSVC.
  • MYAGTTRY.
  • NAVAPSVC.
  • NAVAPW32.
  • NAVLU32.
  • NAVW32.
  • NDD32.
  • NEOWATCHLOG.
  • NEOWATCHTRAY.
  • NISSERV
  • NISUM.
  • NMAIN.
  • NOD32
  • NORMIST.
  • NOTSTART.
  • NPAVTRAY.
  • NPFMNTOR.
  • NPFMSG.
  • NPROTECT.
  • NSCHED32.
  • NSMDTR.
  • NSSSERV.
  • NSSTRAY.
  • NTRTSCAN.
  • NTXCONFIG.
  • NUPGRADE.
  • NVC95.
  • NVCOD.
  • NVCTE.
  • NVCUT.
  • NWSERVICE.
  • OFCPFWSVC.
  • OUTPOST.
  • PAV.
  • PAVFIRES.
  • PAVFNSVR.
  • PAVKRE.
  • PAVPROT.
  • PAVPROXY.
  • PAVPRSRV.
  • PAVSRV51.
  • PAVSS.
  • PCCGUIDE.
  • PCCIOMON.
  • PCCNTMON.
  • PCCPFW.
  • PCCTLCOM.
  • PCTAV.
  • PERSFW.
  • PERTSK.
  • PERVAC.
  • PNMSRV.
  • POP3TRAP.
  • POPROXY.
  • PREVSRV.
  • PSIMSVC.
  • QHM32.
  • QHONLINE.
  • QHONSVC.
  • QHPF.
  • QHWSCSVC.
  • RAVMON.
  • RAVTIMER.
  • REALMON.
  • REALMON95.
  • RFWMAIN.
  • RTVSCAN.
  • RTVSCN95.
  • RULAUNCH.
  • SAVADMINSERVICE.
  • SAVMAIN.
  • SAVPROGRESS.
  • SAVSCAN.
  • SCAN32.
  • SCANNINGPROCESS.
  • SCHED.
  • SDHELP.
  • SHSTAT.
  • SITECLI.
  • SPBBCSVC.
  • SPHINX.
  • SPIDERML.
  • SPIDERNT.
  • SPIDERUI.
  • SPYBOTSD.
  • SPYXX.
  • SS3EDIT.
  • STOPSIGNAV.
  • SWAGENT.
  • SWDOCTOR.
  • SWNETSUP.
  • SYMLCSVC.
  • SYMPROXYSVC.
  • SYMSPORT.
  • SYMWSC.
  • SYNMGR.
  • TAUMON.
  • TBMON.
  • TC.
  • TCA.
  • TCM.
  • TDS-3.
  • TEATIMER.
  • TFAK.
  • THAV.
  • THSM.
  • TMAS.
  • TMLISTEN.
  • TMNTSRV.
  • TMPFW.
  • TMPROXY.
  • TNBUTIL.
  • TRJSCAN.
  • UP2DATE.
  • VBA32ECM.
  • VBA32IFS.
  • VBA32LDR.
  • VBA32PP3.
  • VBSNTW.
  • VCHK.
  • VCRMON.
  • VETTRAY.
  • VIRUSKEEPER.
  • VPTRAY.
  • VRFWSVC.
  • VRMONNT.
  • VRMONSVC.
  • VRRW32.
  • VSECOMR.
  • VSHWIN32.
  • VSMON.
  • VSSERV.
  • VSSTAT.
  • WATCHDOG.
  • WEBPROXY.
  • WEBSCANX.
  • WEBTRAP.
  • WGFE95.
  • WINAW32.
  • WINROUTE.
  • WINSS.
  • WINSSNOTIFY.
  • WRADMIN.
  • WRCTRL.
  • XCOMMSVR.
  • ZATUTOR.
  • ZAUINST.
  • ZLCLIENT.
  • ZONEALARM.

The virus then deletes all values and subkeys under the following subkey, which prevents the compromised computer from booting into Safe Mode:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\SafeBoot
HKEY_CURRENT_USER\System\CurrentControlSet\Control\SafeBoot

Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.
Writeup By: Kaoru Hayashi
Summary| Technical Details| Removal

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