BKDR_PYKOOB.A

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

It uses Windows Task Scheduler to create a scheduled task that executes the dropped copy.

It executes commands from a remote malicious user, effectively compromising the affected system. However, as of this writing, the said sites are inaccessible.

It deletes the initially executed copy of itself.

Arrival Details

This backdoor 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 copies of itself into the affected system and executes them:

• %Application Data%\xvplayer.exe

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It drops the following files:

• %Application Data%\removethat

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It uses Windows Task Scheduler to create a scheduled task that executes the dropped copy.

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
Servant = "%Application Data%\xvplayer.exe"

The scheduled task executes the malware every:

• onlogon

Other System Modifications

This backdoor adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
StartupApproved\Run
Servant = "020000000000000000000000"

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

• Send facebook token and expiration date
• Download, decrypt and execute code from the c&c server
• Download file and execute

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

• http://{BLOCKED}module.com/t.php
• http://{BLOCKED}cksystem.info/a47/t.php

However, as of this writing, the said sites are inaccessible.

Download Routine

This backdoor saves the files it downloads using the following names:

• %Application Data%\updater999.exe

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Information Theft

This backdoor gathers the following data:

• Volume Serial Number
• Baseboard Serial Number
• Malware version
• OS Version

Other Details

This backdoor deletes the initially executed copy of itself

NOTES:

It searches for the cookies related to Facebook.com to retrieve the access token.

It also accesses the Facebook developer tool and Graph API Explorer to retrieve the access token.

It connects to the following URLs to report infection:

• http://{BLOCKED}cksystem.info/a47/check.php
• http://{BLOCKED}oats.info/a47/check.php

It modifies the HOSTS file in the directory %System%\drivers\etc\hosts.

It modifies the HOSTS file to redirect the user whenever it tries to access the following sites:

• localhost
• likdealers.com
• facebookdealers.org
• www.likdealers.com
• www.facebookdealers.org
• fbcdn-dragon-a.akamaihd.net
• www.fbcdn-dragon-a.akamaihd.net
• bitdefender.com
• files.avast.com
• trendmicro.com
• avg.com
• grisoft.com
• avg.cz
• grisoft.cz
• edgesuite.net
• pctools.com
• lavasoft.com
• bitdefender.nl
• virustotal.com
• trendmicro.nl
• trendmicro.com.au
• securesoft.com.au
• avira.com.au
• gratissoftwaresite.nl
• nod32.com.au
• pandasecurity.com.au
• lavasoft.com.au
• avg.com.au
• symantec-norton.com
• malwarebytes.org
• pchelpforum.com
• cnet.com
• techsupportforum.com
• gratissoftware.nu
• majorgeeks.com
• pcworld.com
• microbe.com.au
• avast.com.au
• avg-antivirus.com.au
• nortonantiviruscenter.com
• threatmetrix.com
• zonealarm.com
• firewallguide.com
• auditmypc.com
• comodo.com
• free-firewall.org
• schoonepc.nl
• iopus.com
• tucows.com
• avg-antivirus-plus-firewall.en.softonic.com
• softonic.com
• superantispyware.com.au
• superantispyware.com
• harveynorman.com.au
• ca-store.com.au
• netfreighters.com.au
• securetec.com.au
• anti-spyware.com.au
• virusscan.jotti.org
• virscan.org
• antivir.ru
• avira.com
• analysis.avira.com
• hijackthis.de
• uploadmalware.com
• emsisoft.com
• kaspersky.co.uk
• bitdefender.co.uk
• eset.co.uk
• webroot.com
• gdatasoftware.co.uk
• pcpro.co.uk
• webroot.co.uk
• cyprotect.com
• drweb-antivir.it
• escanav.com
• webroot.nl
• av.eu
• vergelijk.nl
• antivirusvergelijk.nl
• virussen.upc.nl
• antivirus.startpagina.nl
• avastav.nl
• defenx.nl
• gdata.nl
• removevirus.org
• windows.microsoft.com
• answers.microsoft.com
• myantispyware.com
• krebsonsecurity.com
• antivirus.about.com
• cleanuninstall.com
• staples.com
• esetindia.com
• mcafee.free-trials.net
• antivir-2012.com
• panda-antivirus.en.softonic.com
• freeantivirushelp.com
• scanwith.com
• bestantivirusreviewed.com
• virus-help.net
• cleanallspyware.com
• kingsoftsecurity.com
• threatfire.com
• clamav.net
• pcthreat.com
• 2-viruses.com
• trojan-killer.ne
• virusinfo.info
• projecthoneypot.org
• novirus.ru
• anti-malware.com
• offensivecomputing.net
• zeustracker.abuse.ch
• malekal.com
• threatexpert.com
• update.microsoft.com
• av-comparatives.org
• av-test.org
• kasperskyanz.com.au
• bitdefender.com.au
• eset.com.au
• vet.com.au
• mcafee.com
• virusbtn.com
• adwarereport.com
• dw.com
• symantec.com
• spywarewarrior.com
• avsoft.ru
• onecare.live.com
• anubis.iseclab.org
• wepawet.iseclab.org
• iseclab.org
• freespaceinternetsecurity.com
• sunbelt-software.com
• prevx.com
• tuwien.ac.at
• joebox.org
• gmer.net
• antirootkit.com
• sectools.org
• sandboxie.com
• mwcollect.org
• amtso.org
• nsslabs.com
• icsalabs.com
• checkvir.com
• check-mark.com
• protectstar-testlab.org
• anti-malware-test.com
• av-test.de
• wildlist.org
• aavar.org
• centralops.net
• staysafeonline.info
• rokop-security.de
• wilderssecurity.com
• kaspersky.com
• kaspersky.ru
• avp.ru
• viruslist.com
• kaspersky-antivirus.ru
• downloads.kaspersky-labs.com
• kavdumps.kaspersky.com
• kasperskyclub.ru
• kasperskyclub.com
• ftp.kasperskylab.ru
• ftp.kaspersky-labs.com
• ftp.kaspersky.ru
• data.kaspersky.ru
• z-oleg.com
• drweb.com
• freedrweb.com
• drweb.com.ua
• drweb.ru
• av-desk.com
• drweb.net
• ftp.drweb.com
• dr-web.ru
• download.drweb.com
• support.drweb.com
• updates.sald.com
• sald.com
• drweb.imshop.de
• norton.com
• safeweb.norton.com
• liveupdate.symantec.com
• service1.symantec.com
• security.symantec.com
• securityresponse.symantec.com
• sygate.com
• esetnod32.ru
• eset.com
• nod32.com.ua
• nod32.com
• download.eset.com
• update.eset.com
• eset.eu
• nod32.it
• nod32.su
• nod-32.ru
• allnod.com
• allnod.info
• virusall.ru
• nod32eset.org
• eset.sk
• nod32.nl
• antivir.de
• free-av.com
• free-av.de
• forum.avira.com
• avirus.ru
• avirus.com.ua
• home.mcafee.com
• us.mcafee.com
• mcafeesecurity.com
• mcafeesecure.com
• avertlabs.com
• download.nai.com
• nai.com
• secure.nai.com
• eu.shopmcafee.com
• shop.mcafee.com
• mcafeestore.com
• service.mcafee.com
• siteadvisor.com
• avast.ru
• avast.com
• onlinescan.avast.com
• download1.avast.com
• download2.avast.com
• download3.avast.com
• download4.avast.com
• download5.avast.com
• download7.avast.com
• free.avg.com
• au.norton.com
• trustdefender.com
• free.grisoft.com
• msecn.net
• bitdefender.de
• bitdefender.com.ua
• bitdefender.ru
• myaccount.bitdefender.com
• ftp.bitdefender.com
• forum.bitdefender.com
• agnitum.ru
• agnitum.com
• agnitum.de
• outpostfirewall.com
• dl2.agnitum.com
• dl1.agnitum.com
• antivirus.comodo.com
• camas.comodo.com
• comodogroup.com
• personalfirewall.comodo.com
• hackerguardian.com
• nsclean.com
• db.local.clamav.net
• clamsupport.sourcefire.com
• lurker.clamav.net
• clamwin.com
• gietl.com
• clamav.dyndns.org
• f-secure.com
• support.f-secure.com
• f-secure.ru
• ftp.f-secure.com
• europe.f-secure.com
• f-secure.de
• support.f-secure.de
• ftp.f-secure.de
• f-secure.co.uk
• norman.com
• download.norman.no
• sandbox.norman.no
• viruslab.ru
• pandasoftware.com
• anti-virus.by
• virusblokada.ru
• vba32.de
• ftp.nai.com
• secuser.com
• tds.diamondcs.com.au
• windowsupdate.microsoft.com
• lavasoftusa.com
• lavasoftusa.de
• diamondcs.com.au
• shop.ca.com
• v4.windowsupdate.microsoft.com
• v5.windowsupdate.microsoft.com
• noadware.net
• zonelabs.com
• moosoft.com
• model-fx.com
• pccreg.antivirus.com
• k-otik.com
• vupen.com
• housecall.trendmicro.com
• antivirus.cai.com
• sophos.com
• securitoo.com
• nordnet.com
• avgfrance.com
• antivirus-online.de
• ftp.esafe.com
• ftp.microworldsystems.com
• ftp.ca.co
• trendmicro-europe.com
• inline-software.de
• ravantivirus.com
• f-prot.com
• files.f-prot.com
• santivirus.com
• openantivirus.org
• dialognauka.ru
• anti-virus-software-review.com
• antiviraldp.com
• pestpatrol.com
• simplysup.com
• misec.net
• my-etrust.com
• authentium.com
• finjan.com
• ikarus-software.at
• ika-rus.com
• tinysoftware.com
• visualizesoftware.com
• kerio.com
• zonelog.co.uk
• lavasoft.nu
• spywareguide.com
• spyblocker-software.com
• spamhaus.org
• spamcop.net
• bobbear.co.uk
• domaintools.com
• robtex.com
• dnsstuff.com
• ripe.net
• met.police.uk
• nbi.gov.ph
• police.gov.hk
• treasury.gov
• cybercrime.gov
• cybercrime.ch
• enisa.europa.eu
• interpol.int
• fsa.gov.uk
• companies-house.gov.uk
• fraudaid.com
• scambusters.org
• spamtrackers.eu
• emlx.net
• www.dl.google.com
• www.bitdefender.com
• www.files.avast.com
• www.trendmicro.com
• www.avg.com
• www.clients4.google.com
• www.grisoft.com
• www.avg.cz
• www.grisoft.cz
• www.edgesuite.net
• www.pctools.com
• www.lavasoft.com
• www.bitdefender.nl
• www.virustotal.com
• www.trendmicro.nl
• www.trendmicro.com.au
• www.securesoft.com.au
• www.avira.com.au
• www.gratissoftwaresite.nl
• www.nod32.com.au
• www.pandasecurity.com.au
• www.lavasoft.com.au
• www.avg.com.au
• www.symantec-norton.com
• www.malwarebytes.org
• www.pchelpforum.com
• www.cnet.com
• www.techsupportforum.com
• www.gratissoftware.nu
• www.majorgeeks.com
• www.pcworld.com
• www.microbe.com.au
• www.avast.com.au
• www.avg-antivirus.com.au
• www.nortonantiviruscenter.com
• www.threatmetrix.com
• www.zonealarm.com
• www.firewallguide.com
• www.auditmypc.com
• www.comodo.com
• www.free-firewall.org
• www.schoonepc.nl
• www.iopus.com
• www.tucows.com
• www.avg-antivirus-plus-firewall.en.softonic.com
• www.softonic.com
• www.superantispyware.com.au
• www.superantispyware.com
• www.harveynorman.com.au
• www.ca-store.com.au
• www.netfreighters.com.au
• www.securetec.com.au
• www.anti-spyware.com.au
• www.virusscan.jotti.org
• www.virscan.org
• www.antivir.ru
• www.avira.com
• www.analysis.avira.com
• www.hijackthis.de
• www.uploadmalware.com
• www.emsisoft.com
• www.kaspersky.co.uk
• www.bitdefender.co.uk
• www.eset.co.uk
• www.webroot.com
• www.gdatasoftware.co.uk
• www.pcpro.co.uk
• www.webroot.co.uk
• www.cyprotect.com
• www.drweb-antivir.it
• www.escanav.com
• www.webroot.nl
• www.av.eu
• www.vergelijk.nl
• www.antivirusvergelijk.nl
• www.virussen.upc.nl
• www.antivirus.startpagina.nl
• www.avastav.nl
• www.defenx.nl
• www.gdata.nl
• www.removevirus.org
• www.windows.microsoft.com
• www.answers.microsoft.com
• www.myantispyware.com
• www.krebsonsecurity.com
• www.antivirus.about.com
• www.cleanuninstall.com
• www.staples.com
• www.esetindia.com
• www.mcafee.free-trials.net
• www.antivir-2012.com
• www.panda-antivirus.en.softonic.com
• www.freeantivirushelp.com
• www.scanwith.com
• www.bestantivirusreviewed.com
• www.virus-help.net
• www.cleanallspyware.com
• www.kingsoftsecurity.com
• www.threatfire.com
• www.clamav.net
• www.pcthreat.com
• www.2-viruses.com
• www.trojan-killer.ne
• www.virusinfo.info
• www.projecthoneypot.org
• www.novirus.ru
• www.anti-malware.com
• www.offensivecomputing.net
• www.zeustracker.abuse.ch
• www.malekal.com
• www.threatexpert.com
• www.update.microsoft.com
• www.av-comparatives.org
• www.av-test.org
• www.kasperskyanz.com.au
• www.bitdefender.com.au
• www.eset.com.au
• www.vet.com.au
• www.mcafee.com
• www.virusbtn.com
• www.adwarereport.com
• www.dw.com
• www.symantec.com
• www.spywarewarrior.com
• www.avsoft.ru
• www.onecare.live.com
• www.anubis.iseclab.org
• www.wepawet.iseclab.org
• www.iseclab.org
• www.freespaceinternetsecurity.com
• www.sunbelt-software.com
• www.prevx.com
• www.tuwien.ac.at
• www.joebox.org
• www.gmer.net
• www.antirootkit.com
• www.sectools.org
• www.sandboxie.com
• www.mwcollect.org
• www.amtso.org
• www.nsslabs.com
• www.icsalabs.com
• www.checkvir.com
• www.check-mark.com
• www.protectstar-testlab.org
• www.anti-malware-test.com
• www.av-test.de
• www.wildlist.org
• www.aavar.org
• www.centralops.net
• www.staysafeonline.info
• www.rokop-security.de
• www.wilderssecurity.com
• www.kaspersky.com
• www.kaspersky.ru
• www.avp.ru
• www.viruslist.com
• www.kaspersky-antivirus.ru
• www.downloads.kaspersky-labs.com
• www.kavdumps.kaspersky.com
• www.kasperskyclub.ru
• www.kasperskyclub.com
• www.ftp.kasperskylab.ru
• www.ftp.kaspersky-labs.com
• www.ftp.kaspersky.ru
• www.data.kaspersky.ru
• www.z-oleg.com
• www.drweb.com
• www.freedrweb.com
• www.drweb.com.ua
• www.drweb.ru
• www.av-desk.com
• www.drweb.net
• www.ftp.drweb.com
• www.dr-web.ru
• www.download.drweb.com
• www.support.drweb.com
• www.updates.sald.com
• www.sald.com
• www.drweb.imshop.de
• www.norton.com
• www.safeweb.norton.com
• www.liveupdate.symantec.com
• www.service1.symantec.com
• www.security.symantec.com
• www.securityresponse.symantec.com
• www.sygate.com
• www.esetnod32.ru
• www.eset.com
• www.nod32.com.ua
• www.nod32.com
• www.download.eset.com
• www.update.eset.com
• www.eset.eu
• www.nod32.it
• www.nod32.su
• www.nod-32.ru
• www.allnod.com
• www.allnod.info
• www.virusall.ru
• www.nod32eset.org
• www.eset.sk
• www.nod32.nl
• www.antivir.de
• www.free-av.com
• www.free-av.de
• www.forum.avira.com
• www.avirus.ru
• www.avirus.com.ua
• www.home.mcafee.com
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• www.mcafeesecurity.com
• www.mcafeesecure.com
• www.avertlabs.com
• www.download.nai.com
• www.nai.com
• www.secure.nai.com
• www.eu.shopmcafee.com
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• www.mcafeestore.com
• www.service.mcafee.com
• www.siteadvisor.com
• www.avast.ru
• www.avast.com
• www.onlinescan.avast.com
• www.download1.avast.com
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• www.free.avg.com
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• www.trustdefender.com
• www.free.grisoft.com
• www.msecn.net
• www.bitdefender.de
• www.bitdefender.com.ua
• www.bitdefender.ru
• www.myaccount.bitdefender.com
• www.ftp.bitdefender.com
• www.forum.bitdefender.com
• www.agnitum.ru
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• www.dl2.agnitum.com
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• www.antivirus.comodo.com
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• www.gietl.com
• www.clamav.dyndns.org
• www.f-secure.com
• www.support.f-secure.com
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• www.norman.com
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• www.viruslab.ru
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• www.windowsupdate.microsoft.com
• www.lavasoftusa.com
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• www.v4.windowsupdate.microsoft.com
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• www.noadware.net
• www.zonelabs.com
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• www.model-fx.com
• www.pccreg.antivirus.com
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• www.antivirus-online.de
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• www.tinysoftware.com
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• www.kerio.com
• www.zonelog.co.uk
• www.lavasoft.nu
• www.spywareguide.com
• www.spyblocker-software.com
• www.spamhaus.org
• www.spamcop.net
• www.bobbear.co.uk
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• www.ripe.net
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• www.scambusters.org
• www.spamtrackers.eu
• www.emlx.net