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What is yt.dll?

Part of Yahoo! Toolbar by Yahoo!

What is it?

Yahoo! Toolbar is a toolbar that installs on the Internet Explorer and Firefox browsers, within the context of internet access functions. It allows access to several functions, including Yahoo! Search and Yahoo! Mail. Several additional features are available on the Internet Explorer version.
Description of yt.dll from Yahoo!
Yahoo! Toolbar is included in the typical install when downloading Yahoo! Messenger or various other Yahoo! free products. Yahoo! Toolbar allows you to check if your friends are online and change your status right from the browser. You can also enjoy anytime access to Yahoo! Search and your favorite Yahoo! sites.
Download Boost and enjoy your PC. Remove Yahoo! Toolbar and optimize your PC.

How is yt.dll loaded?

Internet Explorer BHO - The yt.dll BHO has a registered CLSID of {02478D38-C3F9-4efb-9B51-7695ECA05670}. A Browser Helper Object (BHO) is a module designed as a plugin for Microsoft's Internet Explorer web browser to provide added functionality. A BHO can introduce visible changes to a IE's interface, such as installing toolbars, but it can also run without any change to the interface.
Internet Explorer toolbar - The yt.dll browser toolbar extension has a registered CLSID of {EF99BD32-C1FB-11D2-892F-0090271D4F88}. These are the toolbars that are typically underneath the navigation bar and menu in Internet Explorer and are visible as either a full or partial row.
Internet Explorer URL search hook - The yt.dll IE search hook plugin has a registered CLSID of {81017EA9-9AA8-4A6A-9734-7AF40E7D593F}. A URL Search Hook is called by Internet Explorer when the browser cannot determine the protocol (such as http, ftp, etc.) of a URL address. When attempting to navigate to a URL that does not contain a protocol, Internet Explorer first attempts to determine the correct protocol using the unmodified address.
Safe for scripting control - yt.dll has a CLSID (globally unique identifier) of {02478D38-C3F9-4efb-9B51-7695ECA05670} with and identifier of CLSID\{02478D38-C3F9-4efb-9B51-7695ECA05670}\Implemented Categories\{7DD95801-9882-11CF-9FA9-00AA006C42C4}. Safe for scripting is a Windows policy that disables the Internet Explorer security prompt for Windows Installer scripts. It allows Web-based programs to install software on the computer without notifying the user. By default, when a script hosted by an Internet browser tries to install a program on the system, the system warns users and allows them to select or refuse the installation. This setting suppresses the warning and allows the installation to proceed.
Safe for initializing control - yt.dll has a CLSID (globally unique identifier) of {02478D38-C3F9-4efb-9B51-7695ECA05670} with and identifier of CLSID\{02478D38-C3F9-4efb-9B51-7695ECA05670}\Implemented Categories\{7DD95802-9882-11CF-9FA9-00AA006C42C4}. When a program is initialized, it can receive data from another program for initializing its state. This is a potential security hazard because the data could come from an untrusted source. Programs that guarantee no security breach regardless of the data source are considered safe for initialization and are registered as such.
Internet Explorer web browser - yt.dll has a CLSID (globally unique identifier) of {EF99BD32-C1FB-11D2-892F-0090271D4F88}. An IE Web Browser application supplements some of Internet Explorer's user interface components for browsing by adding additional features that interact with the Internet Explorer Browser. This is accomplished by utilizing Internet Explorer's layout and rendering engine and extending it.

Community

What is the community is seeing?What is the community is doing?
About 0.3% of all Boost users have the yt.dll file.Of the 0.3% of yt.dll users, 53.0% have disabled it.
How resource intensive is the loaded module yt.dll?
Comparison based on the average resource utilization across all programs.
                              0.00857862% CPU714.9%
Average thread CPU utilization across all loaded modules is 0.00120%.
          3 context switches/sec20.0%
Average context switches for all programs is 15 per second.
Typical file (disk image) location:
C:\Program Files\yahoo!\companion\installs\cpn0\yt.dll

Are there other versions of Yahoo! Toolbar?

What programs install yt.dll?

Yahoo! Toolbar by Yahoo! Inc.
Program URL: us.toolbar.yahoo.com/
Install path: C:\Program Files\Yahoo!\Companion\Installs\cpn1
Size: 2.16 MB
Frontier Yahoo! Toolbar by Yahoo! Inc.
Program URL: frontier.software.yahoo.com/toolbar.php
Install path: C:\Program Files\Yahoo!\Companion\Installs\cpn0
Size: 2.44 MB
att.net Toolbar by AT&T Inc.
Program URL: www.att.net/toolbar
Install path: C:\Program Files\Yahoo!\Companion\Installs\cpn1
Size: 2.15 MB
HijackThis 2.0.2 by Trend Micro Inc. - HijackThis is an open source enumerating tool for Microsoft Windows originally created by Merijn Bellekom, and later sold to Trend Micro. The program is notable for targeting browser-hijacking methods, rather than relyin
Program URL: www.spywareinfo.com/~merijn/
Install path: C:\programs\hijackthis
Size: 1.14 GB
Yahoo! Barre d'outils by Yahoo! Inc.
Program URL: www.yahoo.com/
Install path: C:\Program Files\Yahoo!\Common
Size: 2.14 MB
Verizon Yahoo! Toolbar by Verizon
Program URL: verizon.software.yahoo.com/toolbar
Install path: C:\Program Files\Yahoo!\Companion\Installs\cpn0
Size: 2.1 MB
BT Yahoo! Toolbar by Yahoo! Inc.
Program URL: bt.software.yahoo.com/toolbar
Install path: C:\Program Files\yahoo!\common
Size: 2.1 MB

What else is related?

What Windows OS versions does this run on?

Microsoft Windows XP (5.1.2600.131072)
Microsoft Windows XP (5.1.2600.196608)
Windows Vista (TM) Home Premium (6.0.6002.131072)
Windows Vista (TM) Home Premium (6.0.6002.131072)
Windows 7 Ultimate (6.1.7600.0)
Windows 7 Home Premium (6.1.7601.65536)
Windows 7 Professional (6.1.7601.65536)
Windows 7 Ultimate (6.1.7601.65536)
Windows 7 Home Premium (6.1.7601.65536)
Windows 7 Professional (6.1.7601.65536)
Windows 7 Ultimate (6.1.7601.65536)
Windows 8 (6.2.9200.0)

About Yahoo! Inc.

Yahoo was founded in 1994 by David Filo and Jerry Yang. It has since evolved into a major internet brand with search, content verticals, and other web services. More...
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File details

File name: yt.dll
Publisher: Yahoo! Inc. (verified)
Name: Yahoo! Toolbar
Description: Yahoo! Toolbar
Version: 2012, 11, 26, 02
Product version: 8, 5, 1, 4
Size: 1.45 MB
Original file name: yt.dll

Digital certificate

Issued to: Yahoo! Inc.
Certificate authority: VeriSign
Expiration date: 9/2/2012

Resource utilization

Total CPU: 0.0085786214%
Privileged CPU: 0.0030382276%
User CPU: 0.0055403938%
Context switches /sec: 3
Module memory size: 1.51 MB

Internet Explorer BHO details

CLSID: {02478D38-C3F9-4efb-9B51-7695ECA05670}

Internet Explorer toolbar details

CLSID: {EF99BD32-C1FB-11D2-892F-0090271D4F88}

IE URL search hook details

CLSID: {EF99BD32-C1FB-11D2-892F-0090271D4F88}

Safe for scripting control details

CLSID: {F68E0902-DEE5-C352-7EE5-8F46B0C985CE}
Command: CLSID\{F68E0902-DEE5-C352-7EE5-8F46B0C985CE}\Implemented Categories\{7DD95801-9882-11CF-9FA9-00AA006C42C4}

Safe for initializing control details

CLSID: {F68E0902-DEE5-C352-7EE5-8F46B0C985CE}
Command: CLSID\{F68E0902-DEE5-C352-7EE5-8F46B0C985CE}\Implemented Categories\{7DD95802-9882-11CF-9FA9-00AA006C42C4}

IE web browser details

CLSID: {EF99BD32-C1FB-11D2-892F-0090271D4F88}

Image hashes

MD5: 9e74acd50ae9ce20603824a1223ca4f9
SHA-1: fc290791a3f96f732160d1c7071971141099393b
SHA-256: dc529f3286cbab932c5936a36db3c1e6e3409a438653f69e6ade9d41139142d7

PE image details

Subsystem: Windows GUI
File packed: No
Import Table
advapi32.dll
comctl32.dll
gdi32.dll
imagehlp.dll
iphlpapi.dll
kernel32.dll
msimg32.dll
netapi32.dll
ole32.dll
oleacc.dll
shell32.dll
shlwapi.dll
snmpapi.dll
urlmon.dll
user32.dll
version.dll
wininet.dll
winmm.dll
wtsapi32.dll
Export Table
dllcanunloadnow
dllcommand
dllgetclassobject
dllregisterserver
dllunregisterserver
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