Home Malware Programs Worms JS.Proslikefan

JS.Proslikefan

Posted: September 14, 2012

Threat Metric

Ranking: 3,383
Threat Level: 2/10
Infected PCs: 13,832
First Seen: September 14, 2012
Last Seen: October 16, 2023
OS(es) Affected: Windows

JS.Proslikefan is a JavaScript worm that circulates through file-sharing applications, removable drives and mapped network shares. Once executed, JS.Proslikefan may copy itself to the certain locations. JS.Proslikefan may alter several files in order to change the PC user's home page. JS.Proslikefan creates the certain registry entry so that it can launch automatically every time Windows is started. JS.Proslikefan also deletes the certain registry subkeys and modifies numerous other registry entries, some of them for altering the web browser settings and to alter the DNS setting the infected computer. JS.Proslikefan checks if any of the numerous anti-virus software are installed on the compromised PC and ends mostly security-related processes.

Technical Details

File System Modifications

Tutorials: If you wish to learn how to remove malware components manually, you can read the tutorials on how to find malware, kill unwanted processes, remove malicious DLLs and delete other harmful files. Always be sure to back up your PC before making any changes.

The following files were created in the system:



%ProgramFiles%\3db7\3cb3.js File name: %ProgramFiles%\3db7\3cb3.js
File type: JavaScript file
Mime Type: unknown/js
Group: Malware file
%UserProfile%\Start Menu\Programs\Startup\[ENCODED STRING].js File name: %UserProfile%\Start Menu\Programs\Startup\[ENCODED STRING].js
File type: JavaScript file
Mime Type: unknown/js
Group: Malware file
%UserProfile%\Application Data\uc\cu.js File name: %UserProfile%\Application Data\uc\cu.js
File type: JavaScript file
Mime Type: unknown/js
Group: Malware file
%UserProfile%\Local Settings\Application Data\Mozilla\Firefox\Profiles\user.js File name: %UserProfile%\Local Settings\Application Data\Mozilla\Firefox\Profiles\user.js
File type: JavaScript file
Mime Type: unknown/js
Group: Malware file
%UserProfile%\Local Settings\Application Data\Google\Chrome\User Data\Default\Preferences File name: %UserProfile%\Local Settings\Application Data\Google\Chrome\User Data\Default\Preferences
Group: Malware file
%DriveLetter%\autorun.inf File name: %DriveLetter%\autorun.inf
Mime Type: unknown/inf
Group: Malware file
%DriveLetter%\[SCRIPT NAME].js File name: %DriveLetter%\[SCRIPT NAME].js
File type: JavaScript file
Mime Type: unknown/js
Group: Malware file
%SystemDrive%\prospect\knock File name: %SystemDrive%\prospect\knock
Group: Malware file

Registry Modifications

The following newly produced Registry Values are:

HKEY..\..\{CLSID Path}HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\explorer\ShellServiceObjects\{FD6905CE-952F-41F1-9A6F-135D9C6622CC}HKEY..\..\{Value}HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\"cu" = "%UserProfile%\Application Data\uc\cu.js"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\"MigrateProxy" = "0"HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\"ParseAutoexec" = "0"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\"ProxyEnable" = "0"HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\"EnableFirewall" = "0"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\"AntiVirusDisableNotify" = "1"HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\System\"DisableCMD" = "1"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\"FirewallDisableNotify" = "1"HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\System\"NoDispCPL" = "1"HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\Control Panel\"HomePage" = "1"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\"NofolderOptions" = "1"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\"NoWindowsUpdate" = "1"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\"UpdatesDisableNotify" = "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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\"NoControlPanel" = "1"HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\MRT\"DontReportInfectionInformation" = "1"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\"AntiVirusOverride" = "1"HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\System\"DisableTaskMgr" = "1"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center\"FirewallOverride" = "1"HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\System\"DisableRegistryTools" = "1"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\"Hidden" = "2"HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wscsvc\"Start" = "4"HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\"HideFileExt" = "1"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\"SystemRestoreDisableSR" = "1"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\"www" = "[VALUE FROM CONFIGURATION FILE]"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\URL\DefaultPrefix\"Default" = "[VALUE FROM CONFIGURATION FILE]"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\URL\Prefixes\"Default" = "[VALUE FROM CONFIGURATION FILE]"HKEY..\..\..\..{Subkeys}HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBootHKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\DhcpNameServerHKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\NameServer

Additional Information

The following URL's were detected:
thenewstreams.com
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