BKDR_PUSHDO.ER

This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes commands from a remote malicious user, effectively compromising the affected system.

It deletes the initially executed copy of itself.

Arrival Details

This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This backdoor drops the following file(s)/component(s):

• %User Temp%\slf{random}.bat

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It drops the following copies of itself into the affected system:

• %User Profile%\qygronhazepi.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Autostart Technique

This backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
qygronhazepi = "%User Profile%\qygronhazepi.exe"

Other System Modifications

This backdoor adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
AppManagement = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion
qygronhazepizap = "{random values}"

Propagation

This backdoor uses any of the following Simple Mail Transfer Protocol (SMTP) servers:

• smtp.compuserve.com
• mail.airmail.net
• smtp.directcon.net
• smtp.sbcglobal.yahoo.com
• smtp.mail.yahoo.com
• smtp.live.com

Backdoor Routine

This backdoor may also compose messages that can be part of its spamming routine.

It executes the following commands from a remote malicious user:

• Download and execute files
• Get OS Version
• Get System Information
• Get Network Information
• Retrieve Spam Configuration/Content

It connects to the following URL(s) to send and receive commands from a remote malicious user:

• http://{BLOCKED}oft.ru

Other Details

This backdoor deletes the initially executed copy of itself

NOTES:

It performs random GET Request connection to the following URLs to mask outbound connections:

• 0handicap.at
• 0risiko.de
• 4-elements.ch
• 4darabians.nl
• 4dmobil.at
• 4e-energiezentrale.de
• 4e-solutions.ch
• 4effect.ca
• 4einstitute.jp
• 4elements.gr
• 4elements.hu
• 4elements.us
• 4energia.ee
• 4entertainmentgroup.tv
• 4ergindl.at
• 4ernila.de
• 4erotik.de
• 4estates.eu
• 4eternity.ch
• 4everandever.de
• 4everflashlight.de
• 4evermusic.pl
• 4evernet.de
• 4everweb.nl
• 4every1.cz
• 8wellesley.ca
• 8zstabor.taborak.cz
• 9netweb.it
• 9vad4r95bfux.sy
• accords-bilateraux.ch
• accounting.ee
• accountingtechs.biz

It performs random POST Request connection to the following URLs to mask outbound connections. It may also randomly add the URI (?ptrxcz_{random}) to domains below:

• abv.bg
• access995.com
• accessus.net
• actuslendlease.com
• aeroinc.net
• air-internet.com
• alice-dsl.de
• alice.it
• american.edu
• aol.co
• aol.com.com
• atkearney.com
• att.com
• aussiestockforums.com
• backaviation.com
• bassettfurniture.com
• beautifuldecay.com
• bigfoot.com
• bmw.com
• bodybuilders.com
• bresnan.net
• bumbleandbumble.com
• cableone.net
• caionline.org
• caomcast.net
• capecod.net
• caramail.com
• carolina.com
• casagrande.com
• case.edu
• cbunited.com
• centurytel.net
• cfl.rr.com
• charter.com
• chello.nl
• ciudad.com.ar
• claranet.fr
• club-internet.fr
• coastalnow.net
• col.com
• collegeclub.com
• comporium.net
• connections-etc.net
• conwaycorp.net
• croeso.com
• cwnet.com
• dadlnet.dk
• dangerous-minds.com
• deja.com
• directtv.com
• doctor.com
• dr.dk
• drexel.edu
• earthlink.com
• eastlink.ca
• emailmsn.com
• embarqmail.com
• enter.net
• eresmas.com
• erzt.com
• escape.ca
• evansville.net
• findlay.edu
• flemingc.on.ca
• fluor.com
• free.fr
• freenet.co.uk
• frontier.net
• gamil.com
• gate.net
• gci.net
• gcsu.edu
• gmx.com
• gmx.de
• go2.pl
• goldcockerelbooks.co.uk
• grar.com
• hanmail.net
• happemail.com
• hawaiiantel.net
• hknetmail.com
• hoymail.com
• htcomp.net
• ia.telecom.net
• ig.com.br
• indiatimes.com
• indosat.com
• injersey.com
• ipeg.com
• it.dk
• itexas.net
• job-index.ch
• juno.net
• kazza.com
• kiva.net
• knology.net
• lcvcpa.com
• machlink.com
• mail.com
• maui.net
• mckessonhboc.com
• mediom.com
• merck.com
• metallica.com
• metrocast.net
• mexico.com
• migente.com
• ministryofsound.net
• mix947.com
• models.com
• muscanet.com
• musician.org
• mvts.com
• myway.com
• mzsg.at
• naver.com
• netsync.net
• nifty.com
• nifty.ne.jp
• npower.com
• nsatel.net
• oakland.edu
• ohiou.edu
• onebox.com
• opotonline.net
• optonline.com
• osu.edu
• otakumail.com
• pga.com
• planttel.net
• posten.se
• pru-nw.com
• quixnet.net
• reactionsearch.com
• rehijsoft.ru
• reihtec.com
• ricochet.com
• rwd.com
• rz-online.de
• sandiegoinsider.com
• schoolsports.com
• sexstories.com
• sky.com
• sprintmail.com
• sscomputing.com
• stargate.net
• starpower.net
• stupid.com
• supernet.net
• surfglobal.net
• sympatico.com
• t-online.de
• terra.com.br
• twcny.rr.com
• tylerknott.com
• uafortsmith.edu
• ul.ie
• uncc.edu
• und.edu
• univision.com
• vampirefreaks.com
• verizonwireless.com
• vianet.com.mx
• vmw.com
• vodafone.com
• walmart.com
• webound.com
• whitbreadhotels.com
• wilbursmith.com
• willinet.net
• windstream.net
• world-net.co.nz
• worldnetatt.net
• wp.pl
• www.optonline.com
• yahoo.com.cn
• yahoo.com.hk
• yahoo.dk
• yahoo.gr
• youtube.com
• zoomtown.com