Printer Friendly Page

Discovered: September 11, 2012
Updated: June 24, 2013 10:42:55 AM
Type: Trojan, Worm
Infection Length: 93,108 bytes
Systems Affected: Windows

JS.Proslikefan is a JavaScript worm that spreads through mapped network shares, removable drives, and file-sharing applications.

For more information, please see the following resource:
JavaScript Worm on Steroids

Antivirus Protection Dates

  • Initial Rapid Release version September 11, 2012 revision 032
  • Latest Rapid Release version April 16, 2018 revision 003
  • Initial Daily Certified version September 12, 2012 revision 004
  • Latest Daily Certified version April 14, 2018 revision 001
  • Initial Weekly Certified release date September 19, 2012

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Writeup By: Nino Fred Gutierrez, Alan Neville, Kevin Savage, Asuka Yamamoto

Discovered: September 11, 2012
Updated: June 24, 2013 10:42:55 AM
Type: Trojan, Worm
Infection Length: 93,108 bytes
Systems Affected: Windows

When the worm is executed it may copy itself to the following locations:

  • %UserProfile%\Application Data\uc\cu.js
  • %ProgramFiles%\3db7\3cb3.js
  • %UserProfile%\Start Menu\Programs\Startup\[ENCODED STRING].js

Next, the worm may modify the following files in order to change the user's home page:
  • %UserProfile%\Local Settings\Application Data\Google\Chrome\User Data\Default\Preferences
  • %UserProfile%\Local Settings\Application Data\Mozilla\Firefox\Profiles\user.js

It may also create the following files:
  • %Temp%\Perflib_Perfdata_20c.dat
  • %Temp%\Perflib_Perfdata_210.dat

The worm sets the following attributes for all folders that it creates:
  • Archive
  • Hidden
  • Read-only
  • System

It then creates the following registry entries so that it executes whenever Windows starts:
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\"cu" = "%UserProfile%\Application Data\uc\cu.js"
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\"719" = "%User_Profile%\Application Data\67\719.js"
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\"b326b" = "%User_Profile%\Application Data\a5\b326b.js"

Next, it deletes the following registry subkeys:
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\explorer\ShellServiceObjects\{FD6905CE-952F-41F1-9A6F-135D9C6622CC}

The worm then modifies the following registry entries in order to disable antiviurs and firewall settings on the compromised computer:
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc\"FirewallDisableNotify" = "1"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\Svc\"FirewallOverride" = "1"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\"AntiVirusDisableNotify" = "1"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\"AntiVirusOverride" = "1"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\"FirewallDisableNotify" = "1"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\"FirewallOverride" = "1"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\"UpdatesDisableNotify" = "1"

It then modifies the following registry entries in order to disable command prompt, registry editor, and Windows Task Manager on the compromised computer:
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\"DisableCMD" = "1"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\"DisableRegistryTools" = "1"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\"DisableTaskMgr" = "1"
  • HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\System\"DisableCMD" = "1"
  • HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\System\"DisableTaskMgr" = "1"
  • HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\System\"DisableRegistryTools" = "1"

Next, the worm modifies the following registry entries in order to change the DNS and browser settings on the compromised computer:
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"DhcpNameServer" = "[VALUE FROM CONFIGURATION FILE]"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\"NameServer" = "[VALUE FROM CONFIGURATION FILE]"
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\URL\Prefixes\"www = "[VALUE FROM CONFIGURATION FILE]#"
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\URL\"DefaultPrefix\ = "[VALUE FROM CONFIGURATION FILE]#"
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\Main\"Start Page = "[VALUE FROM CONFIGURATION FILE]"
  • HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\"Start Page = "[VALUE FROM CONFIGURATION FILE]"
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\URL\Prefixes\"Default" = "[VALUE FROM CONFIGURATION FILE]#"

It also modifies the following registry entries:
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\"NoDispCPL" = "1"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\"Advanced\Hidden = 2
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\"SystemRestoreDisableSR" = "1"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\MRT\"DontReportInfectionInformation" = "1"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Internet Explorer\Control Panel\"HomePage" = "1"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\SystemRestore\"DisableConfig" = "1"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wscsvc\"Start" = "4"
  • HKEY_LOCAL_MACHINE\system\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\"EnableFirewall" = "0"
  • HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\"ParseAutoexec" = "0"
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\"HideFileExt" = "1"
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\"ProxyEnable" = "0"
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\"MigrateProxy" = "0"
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\"NofolderOptions" = "1"
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\"NoControlPanel" = "1"
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\"NoWindowsUpdate" = "1"
  • HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\System\"NoDispCPL" = "1"
  • HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Internet Explorer\Control Panel\"HomePage" = "1"

Next, it modifies the following registry entries in order to alter the browser settings on the compromised computer:
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\URL\Prefixes\"www" = "[VALUE FROM CONFIGURATION FILE]"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\URL\DefaultPrefix\"Default" = "[VALUE FROM CONFIGURATION FILE]"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main\"Start Page"22 = "[VALUE FROM CONFIGURATION FILE]"
  • HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\"Start Page" = "[VALUE FROM CONFIGURATION FILE]"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\URL\Prefixes\"Default" = "[VALUE FROM CONFIGURATION FILE]"

It then modifies registry entries under the following subkeys in order to alter the DNS setting on the compromised computer:
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\DhcpNameServer
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\NameServer

The worm then checks if any of the following antivirus programs are installed:
  • Alwil Software
  • AVAST Software
  • AVG
  • Avira
  • Bitdefender
  • DrWeb
  • ESET
  • F-Secure
  • Kaspersky Lab
  • Malwarebytes' Anti-Malware
  • McAfee
  • Microsoft Security Client
  • Microsoft Security Essentials
  • Panda Security
  • Sophos
  • Spyware Doctor
  • Sunbelt
  • Symantec
  • Trend Micro
  • Webroot

It may then end the following (mostly security-related) processes:
  • avast.setup
  • avgmfapx.exe
  • cmd.exe
  • fs2011.exe
  • HijackThis.exe
  • HousecallLauncher.exe
  • issetup.exe
  • mbam.exe
  • mbam-setup.exe
  • mrt.exe
  • mrtstub.exe
  • msconfig.exe
  • mseinstall.exe
  • procexp.exe
  • ptinstall.exe
  • regedit.exe
  • rstrui.exe
  • RUBottedSetup.exe
  • sdasetup.exe
  • setup.exe
  • wuauclt.exe

The worm performs the following actions to determine if it is executing in a virtual environment.

The worm checks whether the following processes are running in memory:
  • autoruns
  • avast
  • avenger
  • avg
  • CaptureClient.exe
  • ccsetup
  • clean
  • combofix
  • dds
  • emergencykit
  • eset
  • exeradar
  • fiddler
  • filemon
  • fs20
  • fss
  • gmer
  • hijack
  • hitman
  • hotfix
  • housecall
  • issetup
  • jrt
  • klwk
  • mbam
  • mbsa
  • mcshield
  • minitool
  • mrt
  • msconfig
  • mse
  • msss
  • npe
  • otl
  • perfmon
  • procexp
  • procmon
  • ptinstall
  • reged
  • regmon
  • resmon
  • rkill
  • roguekiller
  • rstrui
  • rubotted
  • sdasetup
  • sdefendi
  • spybot
  • systemlook
  • tcpview
  • unlocker
  • windows-kb
  • wireshark
  • wuauclt
  • zoek

It also the Bios manufacturer for the following programs:
  • Bochs
  • innotek
  • QEMU
  • Xen

It then checks for the following disk drive models:
  • Bochs
  • QEMU
  • Red Hat
  • VBOX
  • Virtual HDD
  • VMware
  • Xen

The worm also checks that the CPU name is not QEMU or Bochs and that the SCSI Controller name or manufacturer is not Citrix, Xen or Red Hat.

Next, the worm may attempt to contact the following command-and-control (C&C) server:

The worm then downloads a configuration file from the C&C server and saves it to the following location:

If any Google searches respond with possible SQL injection errors, the worm sends the associated information to the C&C server.

It also gathers the following information from the compromised computer and sends it to the C&C server:
  • Computer name
  • Installed anti-malware program information
  • OS version
  • Script information
  • User name

If the user is logged in to Facebook, the worm may perform the following actions:
  • Become a fan of a page
  • Like a page
  • Setup a chat

The worm then modifies the hosts file in an attempt to prevent access to the following domains:
  • antivirus.com
  • bleepingcomputer.com
  • ca.com
  • dispatch.mcafee.com
  • download.bleepingcomputer.com
  • download.cnet.com
  • download.mcafee.com
  • download.microsoft.com
  • downloads.malwarebytes.org
  • downloads.microsoft.com
  • free.antivirus.com
  • f-secure.com
  • go.microsoft.com
  • housecall.trendmicro.com
  • kaspersky.com
  • liveupdate.symantecliveupdate.com
  • malwarebytes.org
  • mast.mcafee.com
  • mcafee.com
  • microsoft.com
  • msdn.microsoft.com
  • mse.dlservice.microsoft.com
  • my-etrust.com
  • nai.com
  • norton.com
  • pandasecurity.com
  • pctools.com
  • secure.nai.com
  • securelist.com
  • securityresponse.symantec.com
  • sophos.com
  • support.microsoft.com
  • symantec.com
  • symantecliveupdate.com
  • trendmicro.com
  • update.symantec.com
  • updates.symantec.com
  • us.mcafee.com
  • us.trendmicro.com
  • v4.windowsupdate.microsoft.com
  • v5.windowsupdate.microsoft.com
  • viruslist.com
  • virustotal.com
  • windows.microsoft.com
  • windowsupdate.microsoft.com
  • windowsupdate.microsoft.com
  • www.antivirus.com
  • www.bleepingcomputer.com
  • www.ca.com
  • www.f-secure.com
  • www.kaspersky.com
  • www.malwarebytes.org
  • www.mcafee.com
  • www.microsoft.com
  • www.my-etrust.com
  • www.nai.com
  • www.norton.com
  • www.pandasecurity.com
  • www.pctools.com
  • www.securelist.com
  • www.sophos.com
  • www.symantec.com
  • www.symantecliveupdate.com
  • www.trendmicro.com
  • www.viruslist.com
  • www.virustotal.com

The above domains are diverted to the following IP address:

The worm then attempts to connect to following DNS servers:
  • bjdszi.eu
  • brzuwiyhqk.ru
  • btlawlvgk.biz
  • bvjnnyah.eu
  • cjmmyi.biz
  • copertps.com
  • damantryglnd.biz
  • erpwrsqs.biz
  • etpsoprc.ru
  • ggrynohjts.info
  • ivlvkfo.net
  • kggactk.name
  • kmwexmxidu.info
  • knkaopkktb.net
  • lefekmynm.name
  • mosuaghqf.name
  • mqigbhlv.net
  • nglvzlzoc.name
  • nzsiwyz.se
  • ofekztbgdax.se
  • ovrzaunb.org
  • ppysupe.se
  • qbjnlj.in
  • qdzzfqo.org
  • qxyrdol.se
  • resqdev.in
  • rtoaglqu.in
  • specrtop.org
  • sqgrys.se
  • tlhgbpq.in
  • towwoxzwbs.com
  • twqayffe.in
  • vuclqbknjt.ru
  • vumvgvg.org
  • vxgzgyf.in
  • www.google.com
  • xnmlpguk.ru
  • ybysyhwpq.eu
  • yxbxbuv.ru
  • zbdkyshlj.eu
  • ztgbdtm.biz

It also attempts to connect to the following websites:
  • [http://]bjdszi.eu/[REMOVED]
  • [http://]brzuwiyhqk.ru/[REMOVED]
  • [http://]btlawlvgk.biz/[REMOVED]
  • [http://]bvjnnyah.eu/[REMOVED]
  • [http://]cjmmyi.biz/[REMOVED]
  • [http://]copertps.com/[REMOVED]
  • [http://]damantryglnd.biz/[REMOVED]
  • [http://]erpwrsqs.biz/[REMOVED]
  • [http://]etpsoprc.ru/[REMOVED]
  • [http://]ggrynohjts.info/[REMOVED]
  • [http://]ivlvkfo.net/[REMOVED]
  • [http://]kggactk.name/[REMOVED]
  • [http://]kmwexmxidu.info/[REMOVED]
  • [http://]knkaopkktb.net/[REMOVED]
  • [http://]lefekmynm.name/[REMOVED]
  • [http://]mosuaghqf.name/[REMOVED]
  • [http://]mqigbhlv.net/[REMOVED]
  • [http://]nglvzlzoc.name/[REMOVED]
  • [http://]nzsiwyz.se/[REMOVED]
  • [http://]ofekztbgdax.se/[REMOVED]
  • [http://]ovrzaunb.org/[REMOVED]
  • [http://]ppysupe.se/[REMOVED]
  • [http://]qbjnlj.in/[REMOVED]
  • [http://]qdzzfqo.org/[REMOVED]
  • [http://]qxyrdol.se/[REMOVED]
  • [http://]resqdev.in/[REMOVED]
  • [http://]rtoaglqu.in/[REMOVED]
  • [http://]specrtop.org/[REMOVED]
  • [http://]sqgrys.se/[REMOVED]
  • [http://]tlhgbpq.in/[REMOVED]
  • [http://]towwoxzwbs.com/[REMOVED]
  • [http://]twqayffe.in/[REMOVED]
  • [http://]vuclqbknjt.ru/[REMOVED]
  • [http://]vumvgvg.org/[REMOVED]
  • [http://]vxgzgyf.in/[REMOVED]
  • [http://]www.google.com/loc/js[REMOVED]
  • [http://]xnmlpguk.ru/[REMOVED]
  • [http://]ybysyhwpq.eu/[REMOVED]
  • [http://]yxbxbuv.ru/[REMOVED]
  • [http://]zbdkyshlj.eu/[REMOVED]
  • [http://]ztgbdtm.biz/[REMOVED]

The worm may also perform the following actions on the compromised computer:
  • Download and execute more programs
  • Download updates of itself

The worm spreads by copying itself to the following locations:
  • %DriveLetter%\[SCRIPT NAME].js
  • %DriveLetter%\6767\g76.js
  • %DriveLetter%\6767\i7a7a7.js
  • %DriveLetter%\a5\gb4.js
  • %DriveLetter%\a5\ib8b.js
  • %AllUsers%\Start Menu\Programs\Startup\24db.js
  • %DriveLetter%\Documents and Settings\Default User\Start Menu\Programs\Startup\24db.js
  • %DriveLetter%\Documents and Settings\All Users\Start Menu\Programs\Startup\e76.js
  • %DriveLetter%\Documents and Settings\Default User\Start Menu\Programs\Startup\e76.js
  • %UserProfile%\Application Data\67\719.js
  • %UserProfile%\Application Data\a5\b326b.js
  • %UserProfile%\Local Settings\Temp\8ef8
  • %UserProfile%\Local Settings\Temp\fd77
  • %UserProfile%\Start Menu\Programs\Startup\24db.js
  • %UserProfile%\Start Menu\Programs\Startup\e76.js
  • %ProgramFiles%\7884\798.js
  • %ProgramFiles%\ba3\bb39b.js
  • %CurrentFolder%\1.bat
  • %CurrentFolder%\i525.js
  • %CurrentFolder%\2.bat
  • %CurrentFolder%\g5e3.js

It also creates the following file so that it executes whenever the drive is accessed:

Next, it downloads configuration data from the following location:

The worm spreads by creating a .zip file, using the configuration data, and copying it to the following file-sharing folders:
  • ares\my shared folder
  • bearshare\shared
  • edonkey2000\incoming
  • emule\incoming
  • grokster\my grokster
  • icq\shared folder
  • kazaa lite k++\my shared folder
  • kazaa lite\my shared folder
  • kazaa\my shared folder
  • limewire\shared
  • morpheus\my shared folder
  • My Documents\FrostWire\Shared
  • tesla\files
  • winmx\shared


Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.

Writeup By: Nino Fred Gutierrez, Alan Neville, Kevin Savage, Asuka Yamamoto

Discovered: September 11, 2012
Updated: June 24, 2013 10:42:55 AM
Type: Trojan, Worm
Infection Length: 93,108 bytes
Systems Affected: Windows

You may have arrived at this page either because you have been alerted by your Symantec product about this risk, or you are concerned that your computer has been affected by this risk.

Before proceeding further we recommend that you run a full system scan . If that does not resolve the problem you can try one of the options available below.

If you are a Norton product user, we recommend you try the following resources to remove this risk.

Removal Tool

If you have an infected Windows system file, you may need to replace it using the Windows installation CD .

How to reduce the risk of infection
The following resources provide further information and best practices to help reduce the risk of infection.

If you are a Symantec business product user, we recommend you try the following resources to remove this risk.

Identifying and submitting suspect files
Submitting suspicious files to Symantec allows us to ensure that our protection capabilities keep up with the ever-changing threat landscape. Submitted files are analyzed by Symantec Security Response and, where necessary, updated definitions are immediately distributed through LiveUpdate™ to all Symantec end points. This ensures that other computers nearby are protected from attack. The following resources may help in identifying suspicious files for submission to Symantec.

Removal Tool

If you have an infected Windows system file, you may need to replace it using the Windows installation CD .

How to reduce the risk of infection
The following resource provides further information and best practices to help reduce the risk of infection.
Protecting your business network

The following instructions pertain to all current Symantec antivirus products.

1. Performing a full system scan
How to run a full system scan using your Symantec product

2. Restoring settings in the registry
Many risks make modifications to the registry, which could impact the functionality or performance of the compromised computer. While many of these modifications can be restored through various Windows components, it may be necessary to edit the registry. See in the Technical Details of this writeup for information about which registry keys were created or modified. Delete registry subkeys and entries created by the risk and return all modified registry entries to their previous values.

Writeup By: Nino Fred Gutierrez, Alan Neville, Kevin Savage, Asuka Yamamoto