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The Internet threat alert status is currently normal. At present, no major epidemics or other serious incidents have been recorded by Kaspersky Lab’s monitoring service. Internet threat level: 1

Trojan.Win32.Qhost.nrq

Detected Aug 07 2010 21:46 GMT
Released Aug 08 2010 05:21 GMT
Published Mar 24 2011 14:02 GMT

Technical Details
Payload
Removal instructions

Technical Details

This Trojan delivers a malicious payload to the user's computer. It is a Windows application (PE EXE file). It is 54 784 bytes in size. It is packed using UPX. The unpacked file is approximately 149 KB in size. It is written in C++.


Payload

Once launched, the Trojan copies the original file:

%System%\drivers\etc\hosts
to the file:
%System%\hosts
Then, the Trojan modifies the original "hosts" file by adding the following strings to it:
62.***.98       ag.ru
62.***.98       www.ag.ru
62.***.98       ask.com
62.***.98       www.ask.com
62.***.98       auto.ru
62.***.98       www.auto.ru
62.***.98       avito.ru
62.***.98       www.avito.ru
62.***.98       bing.com
62.***.98       www.bing.com
62.***.98       blogger.com
62.***.98       www.blogger.com
62.***.98       championat.ru
62.***.98       www.championat.ru
62.***.98       community.livejournal.com
62.***.98       www.community.livejournal.com
62.***.98       depositfiles.com
62.***.98       www.depositfiles.com
62.***.98       diary.ru
62.***.98       www.diary.ru
62.***.98       drweb.com
62.***.98       www.drweb.com
62.***.98       en.wikipedia.org
62.***.98       www.en.wikipedia.org
62.***.98       esetnod32.ru
62.***.98       www.esetnod32.ru
62.***.98       facebook.com
62.***.98       www.facebook.com
62.***.98       fastpic.ru
62.***.98       www.fastpic.ru
62.***.98       fishki.net
62.***.98       www.fishki.net
62.***.98       games.rambler.ru
62.***.98       www.games.rambler.ru
62.***.98       gazeta.ru
62.***.98       www.gazeta.ru
62.***.98       gismeteo.ru
62.***.98       www.gismeteo.ru
62.***.98       google.com
62.***.98       www.google.com
62.***.98       google.ru
62.***.98       www.google.ru
62.***.98       habrahabr.ru
62.***.98       www.habrahabr.ru
62.***.98       hh.ru
62.***.98       www.hh.ru
62.***.98       ifolder.ru
62.***.98       www.ifolder.ru
62.***.98       kaspersky.ru
62.***.98       www.kaspersky.ru
62.***.98       kinopoisk.ru
62.***.98       www.kinopoisk.ru
62.***.98       kinozal.tv
62.***.98       www.kinozal.tv
62.***.98       kp.ru
62.***.98       www.kp.ru
62.***.98       lenta.ru
62.***.98       www.lenta.ru
62.***.98       letitbit.net
62.***.98       www.letitbit.net
62.***.98       live.com
62.***.98       www.live.com
62.***.98       liveinternet.ru
62.***.98       www.liveinternet.ru
62.***.98       livejournal.com
62.***.98       www.livejournal.com
62.***.98       loveplanet.ru
62.***.98       www.loveplanet.ru
62.***.98       love.rambler.ru
62.***.98       www.love.rambler.ru
62.***.98       mail.rambler.ru
62.***.98       www.mail.rambler.ru
62.***.98       mamba.ru
62.***.98       www.mamba.ru
62.***.98       marketgid.com
62.***.98       www.marketgid.com
62.***.98       mirtesen.ru
62.***.98       www.mirtesen.ru
62.***.98       mozilla.com
62.***.98       www.mozilla.com
62.***.98       msn.com
62.***.98       www.msn.com
62.***.98       narod.ru
62.***.98       www.narod.ru
62.***.98       newsru.com
62.***.98       www.newsru.com
62.***.98       nova.rambler.ru
62.***.98       www.nova.rambler.ru
62.***.98       odnoklasniki.ru
62.***.98       www.odnoklasniki.ru
62.***.98       odnoklassniki.ru
62.***.98       www.odnoklassniki.ru
62.***.98       ozon.ru
62.***.98       www.ozon.ru
62.***.98       playground.ru
62.***.98       www.playground.ru
62.***.98       pornolab.net
62.***.98       www.pornolab.net
62.***.98       privet.ru
62.***.98       www.privet.ru
62.***.98       qip.ru
62.***.98       www.qip.ru
62.***.98       radikal.ru
62.***.98       www.radikal.ru
62.***.98       rambler.ru
62.***.98       www.rambler.ru
62.***.98       rapidshare.com
62.***.98       www.rapidshare.com
62.***.98       rbc.ru
62.***.98       www.rbc.ru
62.***.98       rian.ru
62.***.98       www.rian.ru
62.***.98       rutracker.org
62.***.98       www.rutracker.org
62.***.98       rutube.ru
62.***.98       www.rutube.ru
62.***.98       ru.wikipedia.org
62.***.98       www.ru.wikipedia.org
62.***.98       smscost.ru
62.***.98       www.smscost.ru
62.***.98       sms-price.ru
62.***.98       www.sms-price.ru
62.***.98       tfile.ru
62.***.98       www.tfile.ru
62.***.98       torrentdownloads.net
62.***.98       www.torrentdownloads.net
62.***.98       turbobit.net
62.***.98       www.turbobit.net
62.***.98       twitter.com
62.***.98       www.twitter.com
62.***.98       vesti.ru
62.***.98       www.vesti.ru
62.***.98       vip-file.com
62.***.98       www.vip-file.com
62.***.98       vk.com
62.***.98       www.vk.com
62.***.98       vkontakte.ru
62.***.98       www.vkontakte.ru
62.***.98       wordpress.com
62.***.98       www.wordpress.com
62.***.98       yahoo.com
62.***.98       www.yahoo.com
62.***.98       yandex.net
62.***.98       www.yandex.net
62.***.98       yandex.ru
62.***.98       www.yandex.ru
62.***.98       ya.ru
62.***.98       www.ya.ru
62.***.98       youtube.com
62.***.98       www.youtube.com
62.***.98       zaycev.net
62.***.98       www.zaycev.net
62.***.98       kav.ru
62.***.98       www.kav.ru
62.***.98       kaspersky.ru
62.***.98       www.kaspersky.ru
62.***.98       esetnod32.ru
62.***.98       www.esetnod32.ru
62.***.98       eset.com
62.***.98       www.eset.com
62.***.98       drweb.com
62.***.98       www.drweb.com
62.***.98       freedrweb.com
62.***.98       www.freedrweb.com
62.***.98       download.drweb.com
62.***.98       www.download.drweb.com
62.***.98       free-av.com
62.***.98       www.free-av.com
62.***.98       symantec.com
62.***.98       www.symantec.com
62.***.98       pandasecurity.com
62.***.98       www.pandasecurity.com
Thereby, when users attempt to reference the specified resources, they will be redirected to the address:
62.***.98
The Trojan then ceases running.


Removal instructions

If your computer does not have an antivirus, and is infected by this malicious program, follow the instructions below to delete it:

  1. Replace the file:
    %System%\drivers\etc\hosts
    with the following file:
    %System%\hosts
  2. Delete the original Trojan file (its location will depend on how the program originally penetrated the infected computer).
  3. Perform a full scan of the computer using Kaspersky Anti-Virus with up-to-date antivirus databases (download a trial version).


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Trojan

This type of behaviour covers malicious programs that delete, block, modify, or copy data, disrupt computer or network performance, but which cannot be classified under any of the behaviours identified above.

This classification also covers “multipurpose” Trojan programs, i.e. those that are capable of conducting several actions at once and which demonstrate several Trojan behaviours in a single program. This means they cannot be indisputably classified as having any single behaviour.


Other versions

Aliases

Trojan.Win32.Qhost.nrq (Kaspersky Lab) is also known as:

  • Trojan: Generic Qhost!bp (McAfee)
  • Mal/Generic-L (Sophos)
  • Trj/Spambot.C (Panda)
  • Trojan:Win32/Qhost.DB (MS(OneCare))
  • Trojan.Qhost.2930 (DrWeb)
  • Win32/Qhost.NZJ trojan (Nod32)
  • Trojan.Generic.4632759 (BitDef7)
  • Trojan.Qhost!7LNVo/8b934 (VirusBuster)
  • Win32:Malware-gen (AVAST)
  • Trojan.Win32.Qhost (Ikarus)
  • Generic18.BIWL (AVG)
  • TR/Qhost.nrq (AVIRA)
  • Trojan.Gen (NAV)
  • W32/Suspicious_Gen2.DCLTP (Norman)
  • Trojan.Win32.Qhost.nrq [AVP] (FSecure)
  • TROJ_QHOST.WV (TrendMicro)
  • BehavesLike.Win32.Malware (v) (Sunbelt)
  • Trojan.Qhost!7LNVo/8b934 (VirusBusterBeta)