W32.Rontokbro.X@mm

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Discovered: March 24, 2006
Updated: February 13, 2007 12:52:10 PM
Type: Worm
Systems Affected: Windows


W32.Rontokbro.X@mm is a mass-mailing worm that lowers security settings and causes system instability.

Antivirus Protection Dates

  • Initial Rapid Release version March 24, 2006
  • Latest Rapid Release version June 21, 2018 revision 020
  • Initial Daily Certified version March 24, 2006
  • Latest Daily Certified version June 21, 2018 revision 021
  • Initial Weekly Certified release date March 29, 2006

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Writeup By: Hyun Choi

Discovered: March 24, 2006
Updated: February 13, 2007 12:52:10 PM
Type: Worm
Systems Affected: Windows


When W32.Rontokbro.X@mm is executed, it performs the following actions:

  1. Copies itself as the following files:

    • %Windir%\j[RANDOM].exe
    • %Windir%\o[RANDOM].exe
    • %Windir%\_default[RANDOM].pif
    • %System%\c_[RANDOM]k.com

      Notes:
    • %System% is a variable that refers to the System folder. By default this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).
    • %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows (Windows 95/98/Me/XP) or C:\Winnt (Windows NT/2000).

  2. Creates the following file as a marker of infection:

    C:\Baca Bro !!!.txt

  3. Creates one or more of the following folders:

    • %System%\s[RANDOM]
    • %UserProfile%\Local Settings\Application Data\dv6[RANDOM]0x
    • %Windir%\ad[RANDOM]

      Note: %UserProfile% is a variable that refers to the current user's profile folder. By default, this is C:\Documents and Settings\[CURRENT USER] (Windows NT/2000/XP).

  4. Copies itself into these folders as well as %System% and %Windir% as one or more of the following files:

    • Bron-Spizaetus-[RANDOM]
    • c.bron.tok.txt
    • csrss.exe
    • lsass.exe
    • msvbvm60.dll
    • services.exe
    • smss.exe
    • winlogon.exe
    • Spread.Mail.Bro
    • Spread.Sent.Bro
    • sv71[RANDOM]30r.exe
    • Tok-Cirrhatus-[RANDOM]
    • zh59[RANDOM]84y.exe
    • yesbron.com

  5. Adds the subkey:

    Brontok

    to the registry subkey:

    HKEY_CURRENT_USER\Software

  6. Adds the value:

    "f[RANDOM]Adm" = ""%System%\s[RANDOM]\zh59[RANDOM]84y.exe""

    to the registry subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run

    so that it runs every time Windows starts.

  7. Adds the value:

    "N[RANDOM]c" = ""%Windir%\j[RANDOM].exe""

    to the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

    so that it runs every time Windows starts.

  8. Adds the value:

    "N[RANDOM]c" = "%WINDIR%\_default[RANDOM].pif"

    to the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Run

    so that it runs every time Windows starts.

  9. Modifys the value:

    "AlternateShell" = "c_[RANDOM].com"

    in the registry subkey:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot

    so that it runs every time Windows starts.

  10. Modifies the values:

    "Userinit" = "%System%\userinit.exe,%Windir%\j[RANDOM].exe"
    "Shell" = "Explorer.exe "%Windir%\o[random].exe""

    in the registry subkey:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon

  11. Adds the value:

    "DisableRegistryTools" = "1"

    to the registry subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System

    in an attempt to hide itself from the user.

  12. Adds two scheduled tasks that execute the following file at 11:03 and 17:08 every day:

    %UserProfile%\Local Settings\Application Data\jalak-93[RANDOM]15-bali.com

    Following files are created during this step:

    • %System%\Tasks\At1.job
    • %System%\Tasks\At2.job

  13. Attempts to end processes having the following as part of their names:

    • ahnlab
    • aladdin
    • Alicia
    • Anti
    • ash
    • ashmaisv
    • aswupdsv
    • avast
    • avg
    • bitdef
    • ccapps
    • cclaw
    • cillin
    • ctfmon
    • Dian
    • diary
    • foto
    • hijack
    • iexplorer
    • kangen
    • kill
    • lexplorer
    • machine
    • Mariana
    • mcaf
    • mcv
    • movzx
    • mspatch
    • nipsvc
    • njeeves
    • nod32
    • nopdb
    • nvcoas
    • opscan
    • panda
    • peid
    • poproxy
    • remove
    • riyani
    • services.com
    • siti
    • sstray
    • sysinter
    • syslove
    • systray
    • trend
    • tskmgr
    • untukmu
    • update
    • virus
    • vptray
    • washer
    • wscript
    • xpshare
    • zlh

  14. Adds the following lines in the %System%/drivers/etc/hosts file:
    #JowoBot-CrackHost

    127.0.0.22 mcafee.com
    127.0.0.22 www.mcafee.com
    127.0.0.22 mcafee.net
    127.0.0.22 www.mcafee.net
    127.0.0.22 mcafee.org
    127.0.0.22 www.mcafee.org
    127.0.0.22 mcafeesecurity.com
    127.0.0.22 www.mcafeesecurity.com
    127.0.0.22 mcafeesecurity.net
    127.0.0.22 www.mcafeesecurity.net
    127.0.0.22 mcafeesecurity.org
    127.0.0.22 www.mcafeesecurity.org
    127.0.0.22 mcafeeb2b.com
    127.0.0.22 www.mcafeeb2b.com
    127.0.0.22 mcafeeb2b.net
    127.0.0.22 www.mcafeeb2b.net
    127.0.0.22 mcafeeb2b.org
    127.0.0.22 www.mcafeeb2b.org
    127.0.0.22 nai.com
    127.0.0.22 www.nai.com
    127.0.0.22 nai.net
    127.0.0.22 www.nai.net
    127.0.0.22 nai.org
    127.0.0.22 www.nai.org
    127.0.0.22 vil.nai.com
    127.0.0.22 www.vil.nai.com
    127.0.0.22 vil.nai.net
    127.0.0.22 www.vil.nai.net
    127.0.0.22 vil.nai.org
    127.0.0.22 www.vil.nai.org
    127.0.0.22 grisoft.com
    127.0.0.22 www.grisoft.com
    127.0.0.22 grisoft.net
    127.0.0.22 www.grisoft.net
    127.0.0.22 grisoft.org
    127.0.0.22 www.grisoft.org
    127.0.0.22 kaspersky-labs.com
    127.0.0.22 www.kaspersky-labs.com
    127.0.0.22 kaspersky-labs.net
    127.0.0.22 www.kaspersky-labs.net
    127.0.0.22 kaspersky-labs.org
    127.0.0.22 www.kaspersky-labs.org
    127.0.0.22 kaspersky.com
    127.0.0.22 www.kaspersky.com
    127.0.0.22 kaspersky.net
    127.0.0.22 www.kaspersky.net
    127.0.0.22 kaspersky.org
    127.0.0.22 www.kaspersky.org
    127.0.0.22 downloads1.kaspersky-labs.com
    127.0.0.22 www.downloads1.kaspersky-labs.com
    127.0.0.22 downloads1.kaspersky-labs.net
    127.0.0.22 www.downloads1.kaspersky-labs.net
    127.0.0.22 downloads1.kaspersky-labs.org
    127.0.0.22 www.downloads1.kaspersky-labs.org
    127.0.0.22 downloads2.kaspersky-labs.com
    127.0.0.22 www.downloads2.kaspersky-labs.com
    127.0.0.22 downloads2.kaspersky-labs.net
    127.0.0.22 www.downloads2.kaspersky-labs.net
    127.0.0.22 downloads2.kaspersky-labs.org
    127.0.0.22 www.downloads2.kaspersky-labs.org
    127.0.0.22 downloads3.kaspersky-labs.com
    127.0.0.22 www.downloads3.kaspersky-labs.com
    127.0.0.22 downloads3.kaspersky-labs.net
    127.0.0.22 www.downloads3.kaspersky-labs.net
    127.0.0.22 downloads3.kaspersky-labs.org
    127.0.0.22 www.downloads3.kaspersky-labs.org
    127.0.0.22 downloads4.kaspersky-labs.com
    127.0.0.22 www.downloads4.kaspersky-labs.com
    127.0.0.22 downloads4.kaspersky-labs.net
    127.0.0.22 www.downloads4.kaspersky-labs.net
    127.0.0.22 downloads4.kaspersky-labs.org
    127.0.0.22 www.downloads4.kaspersky-labs.org
    127.0.0.22 download.mcafee.com
    127.0.0.22 www.download.mcafee.com
    127.0.0.22 download.mcafee.net
    127.0.0.22 www.download.mcafee.net
    127.0.0.22 download.mcafee.org
    127.0.0.22 www.download.mcafee.org
    127.0.0.22 norton.com
    127.0.0.22 www.norton.com
    127.0.0.22 norton.net
    127.0.0.22 www.norton.net
    127.0.0.22 norton.org
    127.0.0.22 www.norton.org
    127.0.0.22 symantec.com
    127.0.0.22 www.symantec.com
    127.0.0.22 symantec.net
    127.0.0.22 www.symantec.net
    127.0.0.22 symantec.org
    127.0.0.22 www.symantec.org
    127.0.0.22 liveupdate.symantecliveupdate.com
    127.0.0.22 www.liveupdate.symantecliveupdate.com
    127.0.0.22 liveupdate.symantecliveupdate.net
    127.0.0.22 www.liveupdate.symantecliveupdate.net
    127.0.0.22 liveupdate.symantecliveupdate.org
    127.0.0.22 www.liveupdate.symantecliveupdate.org
    127.0.0.22 liveupdate.symantec.com
    127.0.0.22 www.liveupdate.symantec.com
    127.0.0.22 liveupdate.symantec.net
    127.0.0.22 www.liveupdate.symantec.net
    127.0.0.22 liveupdate.symantec.org
    127.0.0.22 www.liveupdate.symantec.org
    127.0.0.22 update.symantec.com
    127.0.0.22 www.update.symantec.com
    127.0.0.22 update.symantec.net
    127.0.0.22 www.update.symantec.net
    127.0.0.22 update.symantec.org
    127.0.0.22 www.update.symantec.org
    127.0.0.22 securityresponse.symantec.com
    127.0.0.22 www.securityresponse.symantec.com
    127.0.0.22 securityresponse.symantec.net
    127.0.0.22 www.securityresponse.symantec.net
    127.0.0.22 securityresponse.symantec.org
    127.0.0.22 www.securityresponse.symantec.org
    127.0.0.22 sarc.com
    127.0.0.22 www.sarc.com
    127.0.0.22 sarc.net
    127.0.0.22 www.sarc.net
    127.0.0.22 sarc.org
    127.0.0.22 www.sarc.org
    127.0.0.22 vaksin.com
    127.0.0.22 www.vaksin.com
    127.0.0.22 vaksin.net
    127.0.0.22 www.vaksin.net
    127.0.0.22 vaksin.org
    127.0.0.22 www.vaksin.org
    127.0.0.22 forum.vaksin.com
    127.0.0.22 www.forum.vaksin.com
    127.0.0.22 forum.vaksin.net
    127.0.0.22 www.forum.vaksin.net
    127.0.0.22 forum.vaksin.org
    127.0.0.22 www.forum.vaksin.org
    127.0.0.22 norman.com
    127.0.0.22 www.norman.com
    127.0.0.22 norman.net
    127.0.0.22 www.norman.net
    127.0.0.22 norman.org
    127.0.0.22 www.norman.org
    127.0.0.22 trendmicro.com
    127.0.0.22 www.trendmicro.com
    127.0.0.22 trendmicro.net
    127.0.0.22 www.trendmicro.net
    127.0.0.22 trendmicro.org
    127.0.0.22 www.trendmicro.org
    127.0.0.22 trendmicro-europe.com
    127.0.0.22 www.trendmicro-europe.com
    127.0.0.22 trendmicro-europe.net
    127.0.0.22 www.trendmicro-europe.net
    127.0.0.22 trendmicro-europe.org
    127.0.0.22 www.trendmicro-europe.org
    127.0.0.22 ae.trendmicro-europe.com
    127.0.0.22 www.ae.trendmicro-europe.com
    127.0.0.22 ae.trendmicro-europe.net
    127.0.0.22 www.ae.trendmicro-europe.net
    127.0.0.22 ae.trendmicro-europe.org
    127.0.0.22 www.ae.trendmicro-europe.org
    127.0.0.22 it.trendmicro-europe.com
    127.0.0.22 www.it.trendmicro-europe.com
    127.0.0.22 it.trendmicro-europe.net
    127.0.0.22 www.it.trendmicro-europe.net
    127.0.0.22 it.trendmicro-europe.org
    127.0.0.22 www.it.trendmicro-europe.org
    127.0.0.22 secunia.com
    127.0.0.22 www.secunia.com
    127.0.0.22 secunia.net
    127.0.0.22 www.secunia.net
    127.0.0.22 secunia.org
    127.0.0.22 www.secunia.org
    127.0.0.22 winantivirus.com
    127.0.0.22 www.winantivirus.com
    127.0.0.22 winantivirus.net
    127.0.0.22 www.winantivirus.net
    127.0.0.22 winantivirus.org
    127.0.0.22 www.winantivirus.org
    127.0.0.22 pandasoftware.com
    127.0.0.22 www.pandasoftware.com
    127.0.0.22 pandasoftware.net
    127.0.0.22 www.pandasoftware.net
    127.0.0.22 pandasoftware.org
    127.0.0.22 www.pandasoftware.org
    127.0.0.22 esafe.com
    127.0.0.22 www.esafe.com
    127.0.0.22 esafe.net
    127.0.0.22 www.esafe.net
    127.0.0.22 esafe.org
    127.0.0.22 www.esafe.org
    127.0.0.22 f-secure.com
    127.0.0.22 www.f-secure.com
    127.0.0.22 f-secure.net
    127.0.0.22 www.f-secure.net
    127.0.0.22 f-secure.org
    127.0.0.22 www.f-secure.org
    127.0.0.22 europe.f-secure.com
    127.0.0.22 www.europe.f-secure.com
    127.0.0.22 europe.f-secure.net
    127.0.0.22 www.europe.f-secure.net
    127.0.0.22 europe.f-secure.org
    127.0.0.22 www.europe.f-secure.org
    127.0.0.22 bhs.com
    127.0.0.22 www.bhs.com
    127.0.0.22 bhs.net
    127.0.0.22 www.bhs.net
    127.0.0.22 bhs.org
    127.0.0.22 www.bhs.org
    127.0.0.22 datafellows.com
    127.0.0.22 www.datafellows.com
    127.0.0.22 datafellows.net
    127.0.0.22 www.datafellows.net
    127.0.0.22 datafellows.org
    127.0.0.22 www.datafellows.org
    127.0.0.22 cheyenne.com
    127.0.0.22 www.cheyenne.com
    127.0.0.22 cheyenne.net
    127.0.0.22 www.cheyenne.net
    127.0.0.22 cheyenne.org
    127.0.0.22 www.cheyenne.org
    127.0.0.22 ontrack.com
    127.0.0.22 www.ontrack.com
    127.0.0.22 ontrack.net
    127.0.0.22 www.ontrack.net
    127.0.0.22 ontrack.org
    127.0.0.22 www.ontrack.org
    127.0.0.22 sands.com
    127.0.0.22 www.sands.com
    127.0.0.22 sands.net
    127.0.0.22 www.sands.net
    127.0.0.22 sands.org
    127.0.0.22 www.sands.org
    127.0.0.22 sophos.com
    127.0.0.22 www.sophos.com
    127.0.0.22 sophos.net
    127.0.0.22 www.sophos.net
    127.0.0.22 sophos.org
    127.0.0.22 www.sophos.org
    127.0.0.22 icubed.com
    127.0.0.22 www.icubed.com
    127.0.0.22 icubed.net
    127.0.0.22 www.icubed.net
    127.0.0.22 icubed.org
    127.0.0.22 www.icubed.org
    127.0.0.22 perantivirus.com
    127.0.0.22 www.perantivirus.com
    127.0.0.22 perantivirus.net
    127.0.0.22 www.perantivirus.net
    127.0.0.22 perantivirus.org
    127.0.0.22 www.perantivirus.org
    127.0.0.22 castlecops.com
    127.0.0.22 www.castlecops.com
    127.0.0.22 castlecops.net
    127.0.0.22 www.castlecops.net
    127.0.0.22 castlecops.org
    127.0.0.22 www.castlecops.org
    127.0.0.22 virustotal.com
    127.0.0.22 www.virustotal.com
    127.0.0.22 virustotal.net
    127.0.0.22 www.virustotal.net
    127.0.0.22 virustotal.org
    127.0.0.22 www.virustotal.org
    127.0.0.22 free-av.com
    127.0.0.22 www.free-av.com
    127.0.0.22 free-av.net
    127.0.0.22 www.free-av.net
    127.0.0.22 free-av.org
    127.0.0.22 www.free-av.org
    127.0.0.22 antivirus.com
    127.0.0.22 www.antivirus.com
    127.0.0.22 antivirus.net
    127.0.0.22 www.antivirus.net
    127.0.0.22 antivirus.org
    127.0.0.22 www.antivirus.org
    127.0.0.22 anti-virus.com
    127.0.0.22 www.anti-virus.com
    127.0.0.22 anti-virus.net
    127.0.0.22 www.anti-virus.net
    127.0.0.22 anti-virus.org
    127.0.0.22 www.anti-virus.org
    127.0.0.22 ca.com
    127.0.0.22 www.ca.com
    127.0.0.22 ca.net
    127.0.0.22 www.ca.net
    127.0.0.22 ca.org
    127.0.0.22 www.ca.org
    127.0.0.22 fajarweb.com
    127.0.0.22 www.fajarweb.com
    127.0.0.22 fajarweb.net
    127.0.0.22 www.fajarweb.net
    127.0.0.22 fajarweb.org
    127.0.0.22 www.fajarweb.org
    127.0.0.22 jasakom.com
    127.0.0.22 www.jasakom.com
    127.0.0.22 jasakom.net
    127.0.0.22 www.jasakom.net
    127.0.0.22 jasakom.org
    127.0.0.22 www.jasakom.org
    127.0.0.22 backup.grisoft.com
    127.0.0.22 www.backup.grisoft.com
    127.0.0.22 backup.grisoft.net
    127.0.0.22 www.backup.grisoft.net
    127.0.0.22 backup.grisoft.org
    127.0.0.22 www.backup.grisoft.org
    127.0.0.22 infokomputer.com
    127.0.0.22 www.infokomputer.com
    127.0.0.22 infokomputer.net
    127.0.0.22 www.infokomputer.net
    127.0.0.22 infokomputer.org
    127.0.0.22 www.infokomputer.org
    127.0.0.22 playboy.com
    127.0.0.22 www.playboy.com
    127.0.0.22 playboy.net
    127.0.0.22 www.playboy.net
    127.0.0.22 playboy.org
    127.0.0.22 www.playboy.org
    127.0.0.22 sex-mission.com
    127.0.0.22 www.sex-mission.com
    127.0.0.22 sex-mission.net
    127.0.0.22 www.sex-mission.net
    127.0.0.22 sex-mission.org
    127.0.0.22 www.sex-mission.org
    127.0.0.22 pornstargals.com
    127.0.0.22 www.pornstargals.com
    127.0.0.22 pornstargals.net
    127.0.0.22 www.pornstargals.net
    127.0.0.22 pornstargals.org
    127.0.0.22 www.pornstargals.org
    127.0.0.22 kaskus.com
    127.0.0.22 www.kaskus.com
    127.0.0.22 kaskus.net
    127.0.0.22 www.kaskus.net
    127.0.0.22 kaskus.org
    127.0.0.22 www.kaskus.org
    127.0.0.22 17tahun.com
    127.0.0.22 www.17tahun.com
    127.0.0.22 17tahun.net
    127.0.0.22 www.17tahun.net
    127.0.0.22 17tahun.org
    127.0.0.22 www.17tahun.org
    127.0.0.22 padinet.com
    127.0.0.22 www.padinet.com
    127.0.0.22 padinet.net
    127.0.0.22 www.padinet.net
    127.0.0.22 padinet.org
    127.0.0.22 www.padinet.org
    127.0.0.22 jeruk.padinet.com
    127.0.0.22 www.jeruk.padinet.com
    127.0.0.22 jeruk.padinet.net
    127.0.0.22 www.jeruk.padinet.net
    127.0.0.22 jeruk.padinet.org
    127.0.0.22 www.jeruk.padinet.org
    127.0.0.22 compactbyte.com
    127.0.0.22 www.compactbyte.com
    127.0.0.22 compactbyte.net
    127.0.0.22 www.compactbyte.net
    127.0.0.22 compactbyte.org
    127.0.0.22 www.compactbyte.org
    127.0.0.22 blog.compactbyte.com
    127.0.0.22 www.blog.compactbyte.com
    127.0.0.22 blog.compactbyte.net
    127.0.0.22 www.blog.compactbyte.net
    127.0.0.22 blog.compactbyte.org
    127.0.0.22 www.blog.compactbyte.org
    127.0.0.22 blogs.compactbyte.com
    127.0.0.22 www.blogs.compactbyte.com
    127.0.0.22 blogs.compactbyte.net
    127.0.0.22 www.blogs.compactbyte.net
    127.0.0.22 blogs.compactbyte.org
    127.0.0.22 www.blogs.compactbyte.org

    #JowoBot-VM Community

  15. Deletes the following files, which are an older version of the worm:

    • empty.pif
    • Antivirus Startup.exe
    • Romantic-Devil.R.exe
    • start.pif

  16. Deletes the following files from the compromised computer:

    • %Windir%\rundll32.exe
    • %Windir%\fonts\tskmgr.exe
    • %Windir%\Systray.exe
    • %Windir%\mspatch.exe
    • %Windir%\LEXPLORER.exe
    • %Windir%\IEXPLORER.exe
    • %Windir%\sstray.exe
    • %System%\winword.exe
    • %System%\kangen.exe
    • %System%\ccapps.exe
    • %System%\syslove.exe
    • %System%\mspatch.exe
    • %System%\untukmu.exe
    • %System%\i75-d2\dkernel.exe
    • %System%\sstray.exe

  17. Gathers email addresses from files with the following extensions on all local drives from C to Y:

    • .bat
    • .pif
    • .com
    • .scr
    • .exe
    • .ppt
    • .xls
    • .doc
    • .cfm
    • .php
    • .asp
    • .wab
    • .eml
    • .csv
    • .html
    • .htm
    • .txt

  18. Avoids sending itself to email addresses that contain any of the following strings in the domain name:

    • billing@
    • info@
    • contoh
    • example
    • smtp
    • xxx
    • test
    • network
    • source
    • program
    • www
    • asdf
    • some
    • your
    • blah
    • spam
    • soft
    • panda
    • norman
    • norton
    • associate
    • symantec
    • security
    • cillin
    • grisoft
    • avg
    • linux
    • crack
    • hack
    • virus
    • microsoft
    • master
    • support
    • secure
    • update
    • develop
    • vaksin
    • satu
    • emailku
    • boleh
    • gaul
    • astaga
    • .web.id
    • .ac.id
    • .or.id
    • .net.id
    • .sch.id
    • .mil.id
    • .go.id
    • .co.id
    • indo
    • telkom
    • plasa

      The worm may append the following prefixes to domain names in an attempt to find Simple Mail Transfer Protocol (SMTP) servers:

    • ns1.
    • mail.
    • smtp.

  19. Uses its own SMTP engine to send itself to the email addresses that it finds. The email has the following characteristics:

    From: [SPOOFED]

    Subject:
    • My Best Photo
    • Fotoku yg Paling Cantik

      Message Body:
    • Hi,
      I want to share my photo with you.
      Wishing you all the best.
      Regards,

    • Hi,
      Aku lg iseng aja pengen kirim foto ke kamu.
      Jangan lupain aku ya !.
      Thanks,

      Attachment:

      Photo.zip

  20. Displays the following text in a console window:

    ######################### BR[REMOVED] #########################
    -- Hentikanlah kebobrokan di nege [REMOVED] il = Tu[REMOVED]plak = Nothing !!!
    No[REMOVED]mdil -->> Kicked by The [REMOVED]tok
    [ By J[REMOVED]t ]


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: Hyun Choi

Discovered: March 24, 2006
Updated: February 13, 2007 12:52:10 PM
Type: Worm
Systems Affected: Windows


The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

  1. Disable System Restore (Windows Me/XP).
  2. Update the virus definitions.
  3. Restart the computer in Safe mode or Safe mode with Command Prompt.
  4. Run a full system scan and delete all the files detected.
  5. Delete any values added to the registry.
  6. Remove all the entries that the risk added to the hosts file.
For specific details on each of these steps, read the following instructions.

1. To disable System Restore (Windows Me/XP)
If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/XP uses this feature, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.

Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.

Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.

For instructions on how to turn off System Restore, read your Windows documentation, or one of the following articles:
Note:
When you are completely finished with the removal procedure and are satisfied that the threat has been removed, reenable System Restore by following the instructions in the aforementioned documents.

For additional information, and an alternative to disabling Windows Me System Restore, see the Microsoft Knowledge Base article: Antivirus Tools Cannot Clean Infected Files in the _Restore Folder (Article ID: Q263455).


2. To update the virus definitions
Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:
  • Running LiveUpdate, which is the easiest way to obtain virus definitions:
    • If you use Norton AntiVirus 2006, Symantec AntiVirus Corporate Edition 10.0, or newer products, LiveUpdate definitions are updated daily. These products include newer technology.
    • If you use Norton AntiVirus 2005, Symantec AntiVirus Corporate Edition 9.0, or earlier products, LiveUpdate definitions are updated weekly. The exception is major outbreaks, when definitions are updated more often.
  • Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted daily. You should download the definitions from the Symantec Security Response Web site and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to Virus Definitions (Intelligent Updater).

    The latest Intelligent Updater virus definitions can be obtained here: Intelligent Updater virus definitions. For detailed instructions read the document: How to update virus definition files using the Intelligent Updater.


3. To restart the computer in Safe mode or Safe mode with Command Prompt
Follow the instructions for your operating system.

Windows 95/98/Me
Shut down the computer and turn off the power. Wait for at least 30 seconds, and then restart the computer in Safe mode. For instructions, read the document: How to start the computer in Safe Mode .

Once in Safe mode (this could take some time) proceed with the next section.

Windows 2000
  1. Shut down the computer, and then turn off the power. Wait for at least 30 seconds, and then restart the computer
  2. When you see the black and white Starting Windows bar at the bottom of the screen, press the F8 key (usually on the top row of the keyboard).
  3. In the Windows 2000 Advanced Options Menu, select Safe mode with Command Prompt, and then press Enter.

    Once the computer opens to a window with a command prompt (you should see a line of text and a blinking cursor), proceed with the next section.

Windows XP
  1. Shut down the computer, and then turn off the power. Wait for at least 30 seconds, and then restart the computer. The computer begins processing a set of instructions known as the Basic Input/Output System (BIOS). What is displayed depends on the BIOS manufacturer. Some computers display a progress bar that refers to the word BIOS, while others may not display any indication that this process is occurring.
  2. As soon as the BIOS has finished loading, begin tapping the F8 key on your keyboard. Continue to do so until the Windows Advanced Options menu appears. If you begin tapping the F8 key too soon, some computers will display a "keyboard error" message. To avoid this, restart the computer and try again.
  3. In the Windows 2000 Advanced Options Menu, select Safe mode with Command Prompt, and then press Enter.

    Once the computer opens to a window with a command prompt (you should see a line of text and a blinking cursor), proceed with the next section.


4. To scan for and delete the infected files
  1. Start your Symantec antivirus program and make sure that it is configured to scan all the files.
  2. Run a full system scan.
  3. If any files are detected, click Delete.

Important: If you are unable to start your Symantec antivirus product or the product reports that it cannot delete a detected file, you may need to stop the risk from running in order to remove it. To do this, run the scan in Safe mode. For instructions, read the document, How to start the computer in Safe Mode . Once you have restarted in Safe mode, run the scan again.

After the files are deleted, restart the computer in Normal mode and proceed with the next section.

Warning messages may be displayed when the computer is restarted, since the threat may not be fully removed at this point. You can ignore these messages and click OK. These messages will not appear when the computer is restarted after the removal instructions have been fully completed. The messages displayed may be similar to the following:

Title: [FILE PATH]
Message body: Windows cannot find [FILE NAME]. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search.


5. To delete the value from the registry
Important: Symantec strongly recommends that you back up the registry before making any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified subkeys only. For instructions refer to the document: How to make a backup of the Windows registry.
  1. Click Start > Run.
  2. Type regedit
  3. Click OK.

    Note: If the registry editor fails to open the threat may have modified the registry to prevent access to the registry editor. Security Response has developed a tool to resolve this problem. Download and run this tool, and then continue with the removal.

  4. Navigate to the subkey:

    HKEY_CURRENT_USER\Software

  5. In the left pane, delete the subkey:

    Brontok

  6. Navigate to the subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run

  7. In the right pane, delete the values:

    "f[RANDOM]Adm" = ""%System%\s[RANDOM]\zh59[RANDOM]84y.exe""
    "N[RANDOM]c" = ""%Windir%\j[RANDOM].exe""

  8. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Run

  9. In the right pane, delete the values:

    "N[RANDOM]c" = "%WINDIR%\_default[RANDOM].pif"

  10. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot

  11. In the right pane, restore the value as the following:

    "AlternateShell" = "cmd.exe"

  12. Navigate to the subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon

  13. In the right pane, restore the values as the following:

    "Userinit" = "%System%\userinit.exe "
    "Shell" = "Explorer.exe"

  14. Navigate to the subkey:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System

  15. In the right pane, restore the original value, if known:

    "DisableRegistryTools" = "1"
  16. Exit the Registry Editor.


6. To remove all the entries that the risk added to the hosts file
  1. Navigate to the following location:

    • Windows 95/98/Me:
      %Windir%
    • Windows NT/2000/XP:
      %Windir%\System32\drivers\etc

      Notes:
    • The location of the hosts file may vary and some computers may not have this file. There may also be multiple copies of this file in different locations. If the file is not located in these folders, search your disk drives for the hosts file, and then complete the following steps for each instance found.
    • %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows (Windows 95/98/Me/XP) or C:\Winnt (Windows NT/2000).

  2. Double-click the hosts file.
  3. If necessary, deselect the "Always use this program to open this program" check box.
  4. Scroll through the list of programs and double-click Notepad.
  5. When the file opens, delete all the entries added by the risk. (See the Technical Details section for a complete list of entries.)
  6. Close Notepad and save your changes when prompted.

Writeup By: Hyun Choi