Manual Removal Guide for Yahoo.YiSouBar

The following instructions have been created to help you to get rid of "Yahoo.YiSouBar" manually.
Use this guide at your own risk; software should usually be better suited to remove malware, since it is able to look deeper.

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Threat Details:

Categories:

• trojan

Description:

actually the software is a toolbar, but it downloads , installs and runs other software without explicit user consent. Downloads are beeing done in background with no display, also searchsite is changed. Products beeing downloaded , installed and run by this trojanare: CnsMin, CnsMin.Zmod

there are variants installing without any user consent at all.

uninstallation is almost complete but does not restore the searchsite nor does it uninstall CnsMin

may be necessary to remove programmfolders manually

Supposed Functionality:

supposed to be some kind of toolbar in cooperation with yahoo

"4. This software provides online such functions as searching, repairing browser, cleaning web garbage, protecting web privacy, enhancing IE search function, and repairing IE security loophole. Users can click http://toolbar.yisou.com/ to get more information about this software."

"5. This software is installed by ActiveX, which is internationally recognized as safe and general-accepted."

Privacy Statement:

"8. 3721 Company warrants that this software does not contain any malicious code aiming to damage users' computer data and obtain users' privacy information, or any functional code to track, monitor and/or operate users' computers, or monitor users' conducts online or offline, or disclose users' privacy."

Removal Instructions:

Installed Software List:

You can try to uninstall products with the names listed below; for items identified by other properties or to avoid malware getting active again on uninstallation, use Spybot-S&D or RunAlyzer to locate and get rid of these entries.

• Products that have a key or property named "{115F6E46-FCBC-41ed-B3B5-3BDDD4AAB5E5}".

Files:

Please use Windows Explorer or another file manager of your choice to locate and delete these files.

• The file at "<$PROGRAMFILES>\yisou\minib.dll".
• The file at "<$PROGRAMFILES>\yisou\yisou.dll".
• The file at "<$PROGRAMFILES>\yisou\yisoub.dll".
• The file at "<$PROGRAMFILES>\yisou\yisous.dll".
• The file at "<$PROGRAMFILES>\yisou\yisoub.dll".
• A file with an unknown location named "yisou.exe".

Make sure you set your file manager to display hidden and system files. If Yahoo.YiSouBar uses rootkit technologies, use our RootAlyzer or our Total Commander anti-rootkit plugins.
You will have to use a global search for files without a name specified. Be extra careful, because just the name might not be enough to identify files!

Folders:

Please use Windows Explorer or another file manager of your choice to locate and delete these folders.

• The directory at "<$PROGRAMFILES>\yisou".

Make sure you set your file manager to display hidden and system files. If Yahoo.YiSouBar uses rootkit technologies, use our RootAlyzer or our Total Commander anti-rootkit plugins.
You will have to use a global search for files without a name specified. Be extra careful, because just the name might not be enough to identify folders!

Registry:

You can use regedit.exe (included in Windows) to locate and delete these registry entries.

• A key in HKEY_CLASSES_ROOT\ named "BhoObj.AxObj", plus associated values.
• A key in HKEY_CLASSES_ROOT\ named "BhoObj.AxObj.1", plus associated values.
• A key in HKEY_CLASSES_ROOT\ named "MiniBrowser.MiniBrowserObj", plus associated values.
• A key in HKEY_CLASSES_ROOT\ named "MiniBrowser.MiniBrowserObj.1", plus associated values.
• A key in HKEY_CLASSES_ROOT\ named "YiSouBar.YiSouBarObj", plus associated values.
• A key in HKEY_CLASSES_ROOT\ named "YiSouBar.YiSouBarObj.1", plus associated values.
• Delete the registry key "{0D69D7BC-85E1-45DF-AB10-2D989C561DC8}" at "HKEY_CLASSES_ROOT\Interface\".
• Delete the registry key "{315D2FFF-B909-4766-926E-F74FA879FB16}" at "HKEY_CLASSES_ROOT\Interface\".
• Delete the registry key "{C43273A6-9085-41CF-8A84-3881363A7EB9}" at "HKEY_CLASSES_ROOT\Interface\".
• Delete the registry key "{2544A4B1-1F82-4F2A-95EA-C97C18BFFB4A}" at "HKEY_CLASSES_ROOT\TypeLib\".
• Delete the registry key "{306DE395-5293-4434-8D82-A3991B8E9261}" at "HKEY_CLASSES_ROOT\TypeLib\".
• Delete the registry key "{C45A4971-735F-4BC1-BB9B-7FD2B13FBBE2}" at "HKEY_CLASSES_ROOT\TypeLib\".
• Delete the registry key "YiSou" at "HKEY_LOCAL_MACHINE\SOFTWARE\".
• Delete the registry value "{115F6E46-FCBC-41ed-B3B5-3BDDD4AAB5E5}" at "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Toolbar\".
• Delete the registry value "{BB936323-19FA-4521-BA29-ECA6A121BC78}" at "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Toolbar\".
• Delete the registry value "{BB936323-19FA-4521-BA29-ECA6A121BC78}" at "HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\URLSearchHooks\".
• Delete the registry key "Quick Search (Yisou.com)" at "HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\MenuExt\".
• Delete the registry key "YiSou" at "HKEY_CURRENT_USER\Software\".

If Yahoo.YiSouBar uses rootkit technologies, use our RegAlyzer, RootAlyzer or our Total Commander anti-rootkit plugins.

Final Words:

If neither Spybot-S&D nor self help did resolve the issue or you would prefer one on one help,

1. Please read these instructions before requesting assistance,
2. Then start your own thread in the Malware Removal Forum where a volunteer analyst will advise you as soon as available.