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Virus:Worm/Autorun.UB
Date discovered:19/08/2008
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:52.224 Bytes
MD5 checksum:58F9F6D04CDCEFBA3FD405039D1DAC0F
VDF version:7.00.06.36
IVDF version:7.00.06.37 - Tuesday, August 19, 2008

 General Methods of propagation:
   • Autorun feature


Aliases:
   •  Kaspersky: Trojan.Win32.Agent.ablv
   •  TrendMicro: WORM_SLEFBOT.SMA
   •  Microsoft: Worm:Win32/Slenfbot.ABS


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003
   • Windows Vista
   • Windows 7


Side effects:
   • Third party control
   • Drops files
   • Registry modification
   • Steals information

 Files It copies itself to the following location:
   • %SYSDIR%\systempre.exe

 Registry One of the following values is added in order to run the process after reboot:

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "System Presets"="systempre.exe"



The following registry key is added:

– [HKLM\SYSTEM\ControlSet001\Services\wuauserv\Parameters]
   • "ServiceDll"="%SYSDIR%\wuausrv.dll"



The following registry key is changed:

Disable Regedit and Task Manager:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System]
   New value:
   • "Disabletaskmgr"=dword:00000001
   • "Disableregistrytools"=dword:00000001

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore]
   New value:
   • "DisableSR"=dword:00000001

– [HKLM\SOFTWARE\Policies\Microsoft\Windows NT\SystemRestore]
   New value:
   • "DisableConfig"=dword:00000001

 Hosts The host file is modified as explained:

– Access to the following domains is effectively blocked:
   • 127.0.0.1 msnfix.changelog.fr
   • 127.0.0.1 www.incodesolutions.com
   • 127.0.0.1 baike.360.cn
   • 127.0.0.1 virusinfo.prevx.com
   • 127.0.0.1 download.bleepingcomputer.com
   • 127.0.0.1 www.dazhizhu.cn
   • 127.0.0.1 www.nabble.com
   • 127.0.0.1 lurker.clamav.net
   • 127.0.0.1 lexikon.ikarus.at
   • 127.0.0.1 research.sunbelt-software.com
   • 127.0.0.1 www.virusdoctor.jp
   • 127.0.0.1 www.elitepvpers.de
   • 127.0.0.1 www.superuser.co.kr
   • 127.0.0.1 ntfaq.co.kr
   • 127.0.0.1 v.dreamwiz.com
   • 127.0.0.1 cit.kookmin.ac.kr
   • 127.0.0.1 forums.whatthetech.com
   • 127.0.0.1 forum.hijackthis.de
   • 127.0.0.1 www.huaifai.go.th
   • 127.0.0.1 www.mostz.com
   • 127.0.0.1 www.krupunmai.com
   • 127.0.0.1 www.cddchiangmai.net
   • 127.0.0.1 forum.malekal.com
   • 127.0.0.1 tech.pantip.com
   • 127.0.0.1 www.247fixes.com
   • 127.0.0.1 forum.sysinternals.com
   • 127.0.0.1 forum.telecharger.01net.com
   • 127.0.0.1 sophos.com
   • 127.0.0.1 www.f-secure.com
   • 127.0.0.1 www.chkrootkit.org
   • 127.0.0.1 diamondcs.com.au
   • 127.0.0.1 www.rootkit.nl
   • 127.0.0.1 www.sysinternals.com
   • 127.0.0.1 www.castlecrops.com
   • 127.0.0.1 www.misec.net
   • 127.0.0.1 safecomputing.umn.edu
   • 127.0.0.1 www.antirootkit.com
   • 127.0.0.1 www.greatis.com
   • 127.0.0.1 www.rootkit.com
   • 127.0.0.1 www.pctools.com
   • 127.0.0.1 www.pcsupportadvisor.com
   • 127.0.0.1 www.resplendence.com
   • 127.0.0.1 www.personal.psu.edu
   • 127.0.0.1 vil.nail.comm
   • 127.0.0.1 search.mcafee.com
   • 127.0.0.1 wwww.mcafee.com
   • 127.0.0.1 download.nai.com
   • 127.0.0.1 wwww.experts-exchange.com
   • 127.0.0.1 www.Merijn.org
   • 127.0.0.1 www.spywareinfo.com
   • 127.0.0.1 www.spybot.info
   • 127.0.0.1 www.viruslist.com
   • 127.0.0.1 www.hijackthis.de
   • 127.0.0.1 www.f-secure.com
   • 127.0.0.1 majorgeeks.com
   • 127.0.0.1 www.avp.com
   • 127.0.0.1 www.virustotal.com
   • 127.0.0.1 www.sophos.com
   • 127.0.0.1 www.avg-antivirus.net
   • 127.0.0.1 www.kaspersky-labs.com
   • 127.0.0.1 www.kaspersky.com
   • 127.0.0.1 www.bleepingcomputer.com
   • 127.0.0.1 www.free.grisoft.com
   • 127.0.0.1 securityresponse.symantec.com
   • 127.0.0.1 www.analysis.seclab.tuwien.ac.at
   • 127.0.0.1 www.symantec.com
   • 127.0.0.1 updates.symantec.com
   • 127.0.0.1 liveupdate.symantecliveupdate.com
   • 127.0.0.1 liveupdate.symantec.com
   • 127.0.0.1 customer.symantec.com
   • 127.0.0.1 update.symantec.com
   • 127.0.0.1 www.mcafee.com
   • 127.0.0.1 www.free.avg.com
   • 127.0.0.1 download.mcafee.com
   • 127.0.0.1 mast.mcafee.com
   • 127.0.0.1 guru0.grisoft.cz
   • 127.0.0.1 guru1.grisoft.cz
   • 127.0.0.1 guru2.grisoft.cz
   • 127.0.0.1 guru3.grisoft.cz
   • 127.0.0.1 guru4.grisoft.cz
   • 127.0.0.1 guru5.grisoft.cz
   • 127.0.0.1 www.virusspy.com
   • 127.0.0.1 www.download.f-secure.com
   • 127.0.0.1 www.housecall.trendmicro.com
   • 127.0.0.1 www.avast.com
   • 127.0.0.1 www.free.avg.com
   • 127.0.0.1 www.onlinescan.avast.com
   • 127.0.0.1 www.futurenow.bitdefender.com
   • 127.0.0.1 www.bitdefender.com
   • 127.0.0.1 www.f-prot.com
   • 127.0.0.1 www.trendsecure.com
   • 127.0.0.1 www.avira.com
   • 127.0.0.1 www.eset.com
   • 127.0.0.1 www.free.avg.com
   • 127.0.0.1 www.free-av.com
   • 127.0.0.1 www.2-spyware.com
   • 127.0.0.1 www.antivir.es
   • 127.0.0.1 www.prevx.com
   • 127.0.0.1 www.ikarus.net
   • 127.0.0.1 www.forums.majorgeeks.com
   • 127.0.0.1 www.castlecops.com
   • 127.0.0.1 www.virusspy.com
   • 127.0.0.1 andymanchesta.com
   • 127.0.0.1 www.trendmicro.com
   • 127.0.0.1 www.fortinet.com
   • 127.0.0.1 www.safer-networking.org
   • 127.0.0.1 www.fortiguardcenter.com
   • 127.0.0.1 www.firewallguide.com
   • 127.0.0.1 www.auditmypc.com
   • 127.0.0.1 www.spywaredb.com
   • 127.0.0.1 www.mxttchina.com
   • 127.0.0.1 www.antivirus.comodo.com
   • 127.0.0.1 www.spywareterminator.com
   • 127.0.0.1 www.eradicatespyware.net
   • 127.0.0.1 www.freespywareremoval.info
   • 127.0.0.1 www.clamav.net
   • 127.0.0.1 www.antivirus.about.com
   • 127.0.0.1 www.pandasecurity.com
   • 127.0.0.1 www.webphand.com
   • 127.0.0.1 www.sandboxie.com
   • 127.0.0.1 www.clamwin.com
   • 127.0.0.1 www.cwsandbox.org
   • 127.0.0.1 www.ca.com
   • 127.0.0.1 www.networkworld.com
   • 127.0.0.1 www.cddchiangmai.net
   • 127.0.0.1 www.threatexpert.com
   • 127.0.0.1 www.norman.com
   • 127.0.0.1 virscan.org
   • 127.0.0.1 www.viruschief.com
   • 127.0.0.1 scanner.virus.org
   • 127.0.0.1 www.hijackthis.de
   • 127.0.0.1 hjt.networktechs.com
   • 127.0.0.1 www.techsupportforum.com
   • 127.0.0.1 www.whatthetech.com
   • 127.0.0.1 www.soccersuck.com
   • 127.0.0.1 forum.piriform.com
   • 127.0.0.1 www.tweaksforgeeks.com
   • 127.0.0.1 www.daniweb.com
   • 127.0.0.1 www.geekstogo.com
   • 127.0.0.1 www.pchell.com
   • 127.0.0.1 www.spyany.com
   • 127.0.0.1 forums.techguy.org
   • 127.0.0.1 www.experts-exchange.com
   • 127.0.0.1 forum.tweaks.com
   • 127.0.0.1 www.wilderssecurity.com
   • 127.0.0.1 www.techspot.com
   • 127.0.0.1 www.thecomputerpitstop.com
   • 127.0.0.1 www.computing.net
   • 127.0.0.1 discussions.virtualdr.com
   • 127.0.0.1 forum.securitycadets.com
   • 127.0.0.1 www.techimo.com
   • 127.0.0.1 www.infosecpodcast.com
   • 127.0.0.1 www.csrrt.org
   • 127.0.0.1 www.net-security.org
   • 127.0.0.1 www.bleedingthreats.net
   • 127.0.0.1 zhidao.baidu.com
   • 127.0.0.1 bbs.360safe.com
   • 127.0.0.1 hjt-data.trend-braintree.com
   • 127.0.0.1 www.360.cn
   • 127.0.0.1 www.baidu.com
   • 127.0.0.1 www.360safe.com
   • 127.0.0.1 www.lavasoft.com
   • 127.0.0.1 www.virscan.org
   • 127.0.0.1 file.ikaka.com
   • 127.0.0.1 www.pantip.com
   • 127.0.0.1 secubox.aldria.com
   • 127.0.0.1 www.forospyware.com
   • 127.0.0.1 www.siteadvisor.com
   • 127.0.0.1 blog.threatfire.com
   • 127.0.0.1 www.threatexpert.com
   • 127.0.0.1 blog.hispasec.com
   • 127.0.0.1 bbs.ikaka.com
   • 127.0.0.1 www.ikaka.com
   • 127.0.0.1 bbs.cfan.com.cn
   • 127.0.0.1 www.cfan.com.cn
   • 127.0.0.1 mailcenter.rising.com.cn
   • 127.0.0.1 mailcenter.rising.com
   • 127.0.0.1 www.rising.com.cn
   • 127.0.0.1 www.rising.com
   • 127.0.0.1 sosvirus.changelog.fr
   • 127.0.0.1 upload.changelog.fr
   • 127.0.0.1 www.raymond.cc
   • 127.0.0.1 changelog.fr
   • 127.0.0.1 www.final4ever.com
   • 127.0.0.1 files.filefont.com
   • 127.0.0.1 www.infos-du-net.com
   • 127.0.0.1 www.trendsecure.com
   • 127.0.0.1 www.spychecker.com
   • 127.0.0.1 www.geekstogo.com
   • 127.0.0.1 forums.maddoktor2.com
   • 127.0.0.1 www.smokey-services.eu
   • 127.0.0.1 download.sysinternals.com
   • 127.0.0.1 www.pcguide.com
   • 127.0.0.1 www.thetechguide.com
   • 127.0.0.1 www.ozzu.com
   • 127.0.0.1 down.360safe.com
   • 127.0.0.1 baike.360.cn
   • 127.0.0.1 kaba.360.cn
   • 127.0.0.1 www.thaicert.org
   • 127.0.0.1 www.offensivecomputing.net
   • 127.0.0.1 www.grisoft.com


 Backdoor Contact server:
The following:
   • **********.NUDECRUZES.COM:48016

As a result it may send information and remote control could be provided.

 Injection     Process name:
   • %WINDIR%\explorer.exe


 File details Programming language:
 The malware program was written in MS Visual C++.


Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Andrei Ilie on Monday, September 5, 2011
Description updated by Andrei Ivanes on Friday, September 9, 2011

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