W32.Kelvir.BF

Risk Level 2: Low

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Discovered: May 4, 2005

Updated: February 13, 2007 12:38:30 PM

Also Known As: Win32.Bropia.{AF, AN, AO} [Computer Associates], IM-Worm.Win32.Kelvir.{af, ai, as, ak} [Kaspersky Lab], W32/Kelvir.worm.gen [McAfee], W32/Kelvir-U [Sophos], WORM_KELVIR.{AH, AQ} [Trend Micro]

Type: Worm

Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP

When W32.Kelvir.BF is executed, it performs the following actions:

Copies itself as %Windir%\svchoste.exe.

Note: %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.
Adds the value:

"Windows Host Service" = "%Windir%\svchoste.exe"

to the registry subkeys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run

so that it is executed every time Windows starts.
Sends one of the following messages to all of the MSN messenger contacts on the compromised computer:
- :D:D wow check it
- :):) haha, this is cool
- (L) you check what i made
- :P Great stuff
- OMG :D This IS GREAT
- BLA :D BLABLA, im bored, look what i made.
  
  The message also contains one of the following links:
- checkthis.ubb.cc
- checkthis.dd.vg
- checkthis.100mbitde.info
- check.100mbitde.info
- OMG.100mbitde.info
When the link is clicked, it redirects the browser to the IP address 65.75.134.170 and downloads services.exe, which is a copy of W32.Spybot.Worm.
Accesses the page "n?id=ADWTRAXnG2VDHToDo8SE/+JBkjnw" on the m1.nedstatbasic.net domain, which may be used as an infection counter.
Ends the following processes, some of which may be security-related:
- ALOGSERV.EXE
- ACKWIN32.EXE
- ADVXDWIN.EXE
- ALERTSVC.EXE
- AMON9X.EXE
- ANTI-TROJAN.EXE
- ANTS.EXE
- APVXDWIN.EXE
- ATCON.EXE
- ATUPDATER.EXE
- ATWATCH.EXE
- AUTODOWN.EXE
- AVCONSOL.EXE
- AVE32.EXE
- AVGCC32.EXE
- AVGCTRL.EXE
- AVGSERV.EXE
- AVGSERV9.EXE
- AVGW.EXE
- AVKSERV.EXE
- AVNT.EXE
- AVP32.EXE
- AVPCC.EXE
- AVPDOS32.EXE
- AVPM.EXE
- AVPTC32.EXE
- AVPUPD.EXE
- AVSCHED32.EXE
- AVSYNMGR.EXE
- AVWIN95.EXE
- AVWINNT.EXE
- AVWUPD32.EXE
- AVXMONITOR9X.EXE
- AVXMONITORNT.EXE
- AVXQUAR.EXE.EXE
- AVXW.EXE
- AgentSvr.exe
- AutoTrace.exe
- Avgctrl.exe
- Avsched32.exe
- BLACKD.EXE
- BLACKICE.EXE
- CFIADMIN.EXE
- CFIAUDIT.EXE
- CFINET.EXE
- CFINET32.EXE
- CLAW95.EXE
- CLAW95CF.EXE
- EVPN.EXE
- CLEANER.EXE
- CLEANER3.EXE
- CMGRDIAN.EXE
- CONNECTIONMONITOR.EXE
- CPD.EXE
- CPDCLNT.EXE
- DEFWATCH.EXE
- DOORS.EXE
- DVP95.EXE
- DVP95_0.EXE
- ECENGINE.EXE
- EFPEADM.EXE
- ESAFE.EXE
- ESPWATCH.EXE
- ETRUSTCIPE.EXE
- EXPERT.EXE
- F-AGNT95.EXE
- F-PROT.EXE
- F-PROT95.EXE
- F-STOPW.EXE
- FINDVIRU.EXE
- FP-WIN.EXE
- FPROT.EXE
- FRW.EXE
- GENERICS.EXE
- GUARD.EXE
- GUARDDOG.EXE
- IAMAPP.EXE
- IAMSERV.EXE
- IBMASN.EXE
- VET95.EXE
- IBMAVSP.EXE
- ICLOAD95.EXE
- ICLOADNT.EXE
- ICMON.EXE
- ICSUPP95.EXE
- ICSUPPNT.EXE
- IFACE.EXE
- IOMON98.EXE
- ISRV95.EXE
- InoRT.exe
- InoRpc.exe
- InoTask.exe
- JEDI.EXE
- LDNETMON.EXE
- LDPROMENU.EXE
- LDSCAN.EXE
- LOCKDOWN.EXE
- LOCKDOWN2000.EXE
- LOOKOUT.EXE
- LUALL.EXE
- LUCOMSERVER.EXE
- MCAGENT.EXE
- MCMNHDLR.EXE
- MCSHIELD.EXE
- MCTOOL.EXE
- MCUPDATE.EXE
- MCVSRTE.EXE
- MCVSSHLD.EXE
- MGAVRTCL.EXE
- MGAVRTE.EXE
- MGHTML.EXE
- MINILOG.EXE
- MONITOR.EXE
- MOOLIVE.EXE
- MPFTRAY.EXE
- MWATCH.EXE
- N32SCANW.EXE
- NAVAPSVC.EXE
- NAVAPW32.EXE
- NAVLU32.EXE
- NAVNT.EXE
- NAVW32.EXE
- NAVWNT.EXE
- NDD32.EXE
- VET32.EXE
- NETUTILS.EXE
- NISSERV.EXE
- NISUM.EXE
- NMAIN.EXE
- NORMIST.EXE
- NPROTECT.EXE
- NPSSVC.EXE
- NSCHED32.EXE
- NTVDM.EXE
- NTXconfig.exe
- NUPGRADE.EXE
- NVC95.EXE
- NWService.exe
- NWTOOL16.EXE
- Navapw32.exe
- NeoWatchLog.exe
- Nui.EXE
- PADMIN.EOUTPOST.EXE
- PADMIN.EXE
- PAVCL.EXE
- PAVSCHED.EXE
- PAVW.EXE
- PCCIOMON.EXE
- PCCWIN98.EXE
- PCFWALLICON.EXE
- PERSFW.EXE
- POP3TRAP.EXE
- POPROXY.EXE
- PORTMONITOR.EXE
- PROCESSMONITOR.EXE
- PVIEW95.EXE
- RAV7.EXE
- RAV7WIN.EXE
- REALMON.EXE
- RESCUE.EXE
- RTVSCN95.EXE
- Realmon.exe
- SAFEWEB.EXE
- SCAN32.EXE
- SCAN95.EXE
- SCANPM.EXE
- SCRSCAN.EXE
- SERV95.EXE
- SMC.EXE
- SPHINX.EXE
- SPYXX.EXE
- SS3EDIT.EXE
- SWEEP95.EXE
- SWNETSUP.EXE
- SYMPROXYSVC.EXE
- SYMTRAY.EXE
- SymProxySvc.exe
- TBSCAN.EXE
- TC.EXE
- TCA.EXE
- TCM.EXE
- TDS-3.EXE
- TDS2-98.EXE
- TDS2-NT.EXE
- TFAK.EXE
- VETTRAY.EXE
- VIR-HELP.EXE
- VPC32.EXE
- VPTRAY.EXE
- VSCAN40.EXE
- VSCHED.EXE
- VSECOMR.EXE
- VSHWIN32.EXE
- VSMAIN.EXE
- VSMON.EXE
- VSSTAT.EXE
- VbCons.exe
- WATCHDOG.EXE
- WEBSCANX.EXE
- WEBTRAP.EXE
- WFINDV32.EXE
- WGFE95.EXE
- WIMMUN32.EXE
- WRADMIN.EXE
- WRCTRL.EXE
- ZAPRO.EXE
- ZONEALARM.EXE
- _AVP32.EXE
- _AVPCC.EXE
- _AVPM.EXE
- apvxdwin.exe
- avkpop.exe
- avkservice.exe
- avkwctl9.exe
- defscangui.exe
- fameh32.exe
- fch32.exe
- fih32.exe
- fnrb32.exe
- fsaa.exe
- fsav32.exe
- fsgk32.exe
- fsm32.exe
- fsma32.exe
- fsmb32.exe
- gbmenu.exe
- gbpoll.exe
- iamapp.exe
- netstat.exe
- nisum.exe
- ntrtscan.EXE
- nvsvc32.exe
- pavproxy.exe
- pccntmon.EXE
- pccwin97.EXE
- pcscan.EXE
- regedit.exe
- sbserv.exe
- sscansvc.exe
- taskmgr.exe
- vbcmserv.exe
- vsmon.exe
- zapro.exe
- zonealarm.exe
- ping.exe
- cmd.exe
- tracert.exe
- mirc.exe
- services.msc
Stops the following services, some of which may be security-related:
- MCAFEE
- WEBSCANX
- ANTIVIR
- TrueVector Internet Monitor
- Norton AntiVirus Client
- CFINET
- wscsvc
- SharedAccess
- Event Log
- Zonealarm
- SAFEWEB
- Norton Antivirus Auto Protect Service
- Norton Internet Security Accounts Manager
- Norton Internet Security Proxy Service
- Norton Internet Security Service
- Norton AntiVirus Server
- Norton AntiVirus Auto Protect Service
- CFINET32
- Symantec AntiVirus Client
- McShield
- IPSEC Policy Agent
- DefWatch
- WMDM PMSP Service
- Symantec Proxy Service
- Symantec Event Manager
- Norton AntiVirus Corporate Edition
- ViRobot Professional Monitoring
- AVP.EXE
- ViRobot Expert Monitoring
- savroam
- symantec antivirus
- ViRobot Lite Monitoring
- PC-cillin Personal Firewall
- Trend Micro Proxy Service
- Trend NT Realtime Service
- McAfee.com McShield
- eTrust Antivirus Realtime Server
- McAfee.com VirusScan Online Realtime Engine
- McAfee Agent
- SyGateService
- Sygate Personal Firewall Pro
- Sophos Anti-Virus
- Sophos Anti-Virus Network
- Ahnlab Task Scheduler
- eTrust Antivirus Job Server
- LOCKDOWN2000
- ICMON
- eTrust Antivirus RPC Server
- V3MonNT
- V3MonSvc
- Quick Heal Online Protection
- Kaspersky
- Kaspersky Anti-Virus
- Kaspersky Antivirus
- Kaspersky Client
- kaspersky auto protect service
- kav
- AVG6 Service
- AVP32
- NORTON
- NVC95
- FP-WIN
- IOMON98
- PCCWIN98
- F-PROT95
- F-STOPW
- PVIEW95
- NAVWNT
- NAVRUNR
- NAVLU32
- NAVAPSVC
- NISUM
- SYMPROXYSVC
- RESCUE32
- NISSERV
- ATRACK
- IAMAPP
- LUCOMSERVER
- LUALL
- NMAIN
- NAVW32
- NAVAPW32
- VSSTAT
- VSHWIN32
- AVSYNMGR
- AVCONSOL
- WEBTRAP
- POP3TRAP
- PCCMAIN
- PCCIOMON
- MonSvcNT
- rising process communication center
- rising realtime monitor service
- Windows Firewall
- OfficeScanNT Monitor
- RemoteAgent
- Panda Antivirus
- ZoneAlarm
- Detector de OfficeScanNT
- Norton Internet Security Proxy Srvice
- Norton Internet Security service
- Sygate Personal Firewall
- Security Center
- nvscv
- Windows Internet Connection Sharing(ICS)
- NAV Alert
- NAV Auto-Protect
- ScriptBlocking Service
- Background Intelligent Transfer Service
- System Event Notification
- BlackICE
- AVSync Manager
- officescannt realtime scan
- officescannt listener
- services32 service: msinit
- msinit
- AVP control center service
- KAV Moniter Service
- P2P Networking
- gear security
- MastDLL
- MsInt
- MsIntScan
- FireBall
- FireBaum
- Eventask
- fxsvc
- InternetFirewallProc
- Serv-U
- mcafee framework service
- task manager
- mcshield
- config loader
- iroff
- servu
- secur2
- avast! iavs4 control service
- avast! antivirus
- fix-it task manager
- dllhost
- dns
- outpost firewall service
- scvhost
- syslock
- snake sockproxy service
- msclol2
- msclol8
- systemsecuritydll
- vnc server
- intel pds
- intel file transfer
- internet pr0tocol
- smss
- rundll
- Serv-U FTP Server
- Norton Unerase Protection
- AVG7 Alert Manager Server
- AVG7 Update Service
- kerio personal firewall
- Rising Process Communication Center
- Rising Realtime Monitor Service
- Kingsoft AntiVirus Service
- VNC server
- Internet Connection Firewall (ICF) / Internet Connection Sharing (ICS)
- symantec central quarantine
- symantec quarantine agent
- symantec quarantine scanner
- psexesvc
- etrust antivirus rpc server
- etrust antivirus realtime server
- etrust antivirus job server
- remotely possible/32
- win32sl
- altiris client service
- pcanywhere host service
- carbon copy access edition
- directupdate engine
- noipducservice

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: Candid Wueest

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