Threat Descriptions

Trojan-Proxy:W32/Kvadr.gen!A

Classification

Category :

Malware

Type :

Trojan-Proxy

Platform :

W32

Aliases :

Trojan-Proxy:W32/Kvadr.gen!A, TrojanProxy:Win32/Dosenjo (Microsoft)

Summary

This type of trojan allows unauthorized parties to use the infected computer as a proxy server to access the Internet anonymously.

Removal

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

Installation

The trojan-proxy can create a file, as shown below.

  • c:\Documents and Settings\All Users\Application Data\loggy.txt

It will drop the downloaded component to following folders:

  • c:\Documents and Settings\[user]\Local Settings\Temp\csrss 5.dll
  • c:\WINDOWS\system32\csrss 5.dll

Where the '5' in the filename stands for OS version.It will also create a copy of itself at:

  • c:\Documents and Settings\All Users\Application Data\csrss.exe

Activity

While active, the trojan-proxy attempts to connect to the following domains:

  • propellero.com
  • googlestats.ru
  • alexastats.ru
  • profeller.ru
  • google-ana1itics.com
  • searchmachiner.com

With the following GET request:

  • s.html?cachingDeny=f9eolXC8sZY6590K&id=PCWUA99y0qWV3qFo HTTP/1.1\r\n

where 'f9eolXC8sZY6590K' is a random string and 'PCWUA99y0qWV3qFo' is a machine ID.After successfully connecting to one or more of those above mentioned links, it will download an additional component from the link below and start accepting connections on port 80.

  • /u.php?cashingDeny=f9eolXC8sZY6590K&id=PCWUA99y0qWV3qFo HTTP/1.1\r\n user-agent: Kvadrlson 1.0

This proxy's activity can be recognized by its user-agent, Kvadrlson 1.0.It also downloads a new hosts file, affecting a large range of domains, some of which are shown below: 

 
127.0.0.1 go.mail.ru 
127.0.0.1 nova.rambler.ru 
127.0.0.1 google.ad 
127.0.0.1 www.google.ad 
127.0.0.1 google.ae 
127.0.0.1 www.google.ae 
127.0.0.1 google.com.af 
127.0.0.1 www.google.com.af 
127.0.0.1 google.com.ag 
127.0.0.1 www.google.com.ag 
127.0.0.1 google.com.ai 
127.0.0.1 www.google.com.ai 
127.0.0.1 google.am 
127.0.0.1 www.google.am 
127.0.0.1 google.com.ar 
127.0.0.1 www.google.com.ar 
127.0.0.1 google.as 
127.0.0.1 www.google.as 
127.0.0.1 google.at 
127.0.0.1 www.google.at 
127.0.0.1 google.com.au 
127.0.0.1 www.google.com.au 
127.0.0.1 www.google.co.uz 
127.0.0.1 search.msn.com 
127.0.0.1 search.live.com 
127.0.0.1 search.msn.com.hk 
127.0.0.1 search.prodigy.msn.com 
127.0.0.1 cnweb.search.live.com 
127.0.0.1 search.msn.co.jp 
127.0.0.1 livesearch.msn.co.kr 
127.0.0.1 search.msn.com.my 
127.0.0.1 search.msn.com.ph 
127.0.0.1 search.msn.com.sg 
127.0.0.1 search.yahoo.com 
127.0.0.1 ca.search.yahoo.com 
127.0.0.1 ar.search.yahoo.com 
127.0.0.1 cl.search.yahoo.com 
127.0.0.1 search.yahoo.co.jp 
127.0.0.1 kr.search.yahoo.com 
127.0.0.1 malaysia.search.yahoo.com 
127.0.0.1 nz.search.yahoo.com 
127.0.0.1 images.google.ca 
127.0.0.1 images.google.co.uk 
127.0.0.1 news.google.com 
127.0.0.1 news.google.ca 
127.0.0.1 news.google.co.uk 
127.0.0.1 video.google.com 
127.0.0.1 video.google.ca 
127.0.0.1 video.google.co.uk 
127.0.0.1 blogsearch.google.com 
127.0.0.1 blogsearch.google.ca 
127.0.0.1 blogsearch.google.co.uk 
127.0.0.1 searchservice.myspace.com 
127.0.0.1 search.comcast.net 
127.0.0.1 ask.com 
127.0.0.1 www.ask.com 
127.0.0.1 search.aol.com 
127.0.0.1 search.netscape.com 
127.0.0.1 my.att.net 
127.0.0.1 yandex.ru 
127.0.0.1 www.yandex.ru 
127.0.0.1 yandex.ua 
127.0.0.1 www.yandex.ua 
127.0.0.1 baidu.com 
127.0.0.1 www.baidu.com 
127.0.0.1 shop.ebay.com 
127.0.0.1 shop.ebay.co.uk 
127.0.0.1 search.ebay.com 
127.0.0.1 search.ebay.co.uk 
127.0.0.1 motors.shop.ebay.com 
127.0.0.1 en.search.wordpress.com 
127.0.0.1 en.wikipedia.org 
127.0.0.1 search.cnn.com 
127.0.0.1 information.com 
127.0.0.1 www.information.com 
127.0.0.1 search.microsoft.com 
127.0.0.1 search.about.com 
127.0.0.1 search.icq.com 
127.0.0.1 www.icq.com 
127.0.0.1 www.verizon.net 
127.0.0.1 verizon.net 
127.0.0.1 search.lycos.com 
127.0.0.1 youporn.com 
127.0.0.1 www.youporn.com

Process Changes

Creates these mutexes:

  • BabloPodejdaetZlo2

Registry Modifications

Creates these keys:

  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\Csrss Asynchronous = 0x00000000 (0) DllName = "csrss5.dll" Impersonate = 0x00000000 (0) Logon = "StrtPrc"
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion SvchostID = "PCWUA99y0qWV3qFo"
  • HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion Svchost[DbVersion]"5"
  • HKEY_USERS\.DEFAULT\SOFTWARE\Microsoft\Windows\CurrentVersion Svchost[DbVersion]"5"
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Servers snagbznfg.eh - > fantomast.ru uhlnzon.pbz - > huyamba.com purffbvq.pbz - > chessoid.com ibgrfvax.pbz - > votesink.com svarxbybffnyqb.pbz - > finekolossado.com ratvar.qryb-ixhfn.pbz - > engine.delo-vkusa.com
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List C:\Documents and Settings\All Users\Application Data\csrss.exe = "C:\Documents and Settings\All Users\Application Data\csrss:*:Enabled:svchost
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPOrts\List 110:TCP = "110:TCP:*:Enabled:svchost"