PUA.Win32.Youdao.AAQ

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

It does not have any propagation routine.

It does not have any backdoor routine.

It does not have any information-stealing capability.

Arrival Details

This Potentially Unwanted Application 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 Potentially Unwanted Application drops the following files:

• %User Temp%\nsc{Random}.tmp
• %User Temp%\nss{Random}.tmp\rank.bmp
• %User Temp%\nss{Random}.tmp\toolbar.bmp
• %User Temp%\nss{Random}.tmp\toolbar.ini
• %User Temp%\nss{Random}.tmp\pagerank.ini
• %User Temp%\nss{Random}.tmp\finish.ini
• %User Temp%\nss{Random}.tmp\ioSpecial.ini
• %User Temp%\nss{Random}.tmp\modern-wizard.bmp
• %User Temp%\nss{Random}.tmp\InstallOptions.dll
• %Program Files%\Youdao\Dict4\vendor.dat
• %User Temp%\nss{Random}.tmp\System.dll
• %Program Files%\Youdao\Dict4\RunDict.exe
• %Program Files%\Youdao\Dict4\YodaoDict.exe
• %Program Files%\Youdao\Dict4\Acrobat2Dict.dll
• %Program Files%\Youdao\Dict4\CrashRpt.dll
• %Program Files%\Youdao\Dict4\TextExtractorImpl32.dll
• %Program Files%\Youdao\Dict4\TextExtractorImpl64.dll
• %Program Files%\Youdao\Dict4\WordStrokeHelper32.dll
• %Program Files%\Youdao\Dict4\WordStrokeHelper64.dll
• %Program Files%\Youdao\Dict4\XDLL.dll
• %Program Files%\Youdao\Dict4\YoudaoGetWord32.dll
• %Program Files%\Youdao\Dict4\YoudaoGetWord64.dll
• %Program Files%\Youdao\Dict4\YodaoDict.api
• %Program Files%\Youdao\Dict4\WordBook.exe
• %Program Files%\Youdao\Dict4\YoudaoEH.exe
• %Program Files%\Youdao\Dict4\YoudaoWSH.exe
• %Program Files%\Youdao\Dict4\default_config.ini
• %Program Files%\Youdao\Dict4\YDChromeTextExtractor.crx
• %Program Files%\Youdao\Dict4\Monitor.exe
• %Program Files%\Youdao\Dict4\dictcn.db
• %Program Files%\Youdao\Dict4\dicten.db
• %Program Files%\Youdao\Dict4\versions.xml
• %Program Files%\Youdao\Dict4\resultui\commonfile.xsl
• %Program Files%\Youdao\Dict4\resultui\exampleresult.xsl
• %Program Files%\Youdao\Dict4\resultui\index.html
• %Program Files%\Youdao\Dict4\resultui\index3.html
• %Program Files%\Youdao\Dict4\resultui\instantresult.xsl
• %Program Files%\Youdao\Dict4\resultui\lj.html
• %Program Files%\Youdao\Dict4\resultui\property.ini
• %Program Files%\Youdao\Dict4\resultui\queryresult.html
• %Program Files%\Youdao\Dict4\resultui\result.xsl
• %Program Files%\Youdao\Dict4\resultui\smartresult.html
• %Program Files%\Youdao\Dict4\resultui\smartresult.xsl
• %Program Files%\Youdao\Dict4\resultui\verifycode.html
• %Program Files%\Youdao\Dict4\resultui\wiki.html
• %Program Files%\Youdao\Dict4\resultui\wikiresult.xsl
• %Program Files%\Youdao\Dict4\resultui\css\default.css
• %Program Files%\Youdao\Dict4\resultui\css\new-sprite.png
• %Program Files%\Youdao\Dict4\resultui\css\play.png
• %Program Files%\Youdao\Dict4\resultui\images\baike.jpg
• %Program Files%\Youdao\Dict4\resultui\images\cidian_aqurebutton_close.gif
• %Program Files%\Youdao\Dict4\resultui\images\cidian_aqurebutton_open.gif
• %Program Files%\Youdao\Dict4\resultui\images\cidian_point_empty.gif
• %Program Files%\Youdao\Dict4\resultui\images\cidian_point_solid.gif
• %Program Files%\Youdao\Dict4\resultui\images\displaypoint.gif
• %Program Files%\Youdao\Dict4\resultui\images\earthpic.jpg
• %Program Files%\Youdao\Dict4\resultui\images\examples.jpg
• %Program Files%\Youdao\Dict4\resultui\images\graypoint.gif
• %Program Files%\Youdao\Dict4\resultui\images\graypointpoint.gif
• %Program Files%\Youdao\Dict4\resultui\images\logo.gif
• %Program Files%\Youdao\Dict4\resultui\images\logo.png
• %Program Files%\Youdao\Dict4\resultui\images\newfeaturepic.gif
• %Program Files%\Youdao\Dict4\resultui\images\nosound.GIF
• %Program Files%\Youdao\Dict4\resultui\images\outlink.gif
• %Program Files%\Youdao\Dict4\resultui\images\submitbutton.gif
• %Program Files%\Youdao\Dict4\resultui\images\voice.swf
• %Program Files%\Youdao\Dict4\resultui\index\index4.html
• %Program Files%\Youdao\Dict4\resultui\index\lj.html
• %Program Files%\Youdao\Dict4\resultui\index\wiki.html
• %Program Files%\Youdao\Dict4\resultui\index\css\index.css
• %Program Files%\Youdao\Dict4\resultui\index\css\index\Thumbs.db
• %Program Files%\Youdao\Dict4\resultui\index\css\index\button.png
• %Program Files%\Youdao\Dict4\resultui\index\css\index\button_down.png
• %Program Files%\Youdao\Dict4\resultui\index\css\index\button_hover.png
• %Program Files%\Youdao\Dict4\resultui\index\css\index\down.png
• %Program Files%\Youdao\Dict4\resultui\index\css\index\hover.png
• %Program Files%\Youdao\Dict4\resultui\index\css\index\index.png
• %Program Files%\Youdao\Dict4\resultui\index\css\index\index_split.png
• %Program Files%\Youdao\Dict4\resultui\index\css\index\new.png
• %Program Files%\Youdao\Dict4\resultui\index\css\index\original_sound.png
• %Program Files%\Youdao\Dict4\resultui\index\css\index\right.png
• %Program Files%\Youdao\Dict4\resultui\index\css\index\wrong.png
• %Program Files%\Youdao\Dict4\resultui\index\images\baike.jpg
• %Program Files%\Youdao\Dict4\resultui\index\images\examples.jpg
• %Program Files%\Youdao\Dict4\resultui\index\js\index.js
• %Program Files%\Youdao\Dict4\resultui\index\js\jquery.min.js
• %Program Files%\Youdao\Dict4\resultui\index\js\jquery.pngFix.js
• %Program Files%\Youdao\Dict4\resultui\index\js\loadEveryDayEnglish.js
• %Program Files%\Youdao\Dict4\resultui\js\default.js
• %Program Files%\Youdao\Dict4\resultui\js\jquery.min.js
• %Program Files%\Youdao\Dict4\resultui\js\jquery.pngFix.js
• %Program Files%\Youdao\Dict4\resultui\js\swfobject.js
• %Program Files%\Youdao\Dict4\resultui\js\ui.js
• %Program Files%\Youdao\Dict4\skins\default.css
• %Program Files%\Youdao\Dict4\skins\default.png
• %Program Files%\Youdao\Dict4\skins\win7-default.bmp
• %Program Files%\Youdao\Dict4\skins\win7-default.xml
• %Program Files%\Youdao\Dict4\skins\xp-default.bmp
• %Program Files%\Youdao\Dict4\skins\xp-default.xml
• %Program Files%\Youdao\Dict4\skins\new-year\new-year.bmp
• %Program Files%\Youdao\Dict4\skins\new-year\new-year.css
• %Program Files%\Youdao\Dict4\skins\new-year\new-year.png
• %Program Files%\Youdao\Dict4\skins\new-year\new-year.xml
• %Program Files%\Youdao\Dict4\skins\new-year\new-year-index\button.png
• %Program Files%\Youdao\Dict4\skins\new-year\new-year-index\button_down.png
• %Program Files%\Youdao\Dict4\skins\new-year\new-year-index\button_hover.png
• %Program Files%\Youdao\Dict4\skins\new-year\new-year-index\down.png
• %Program Files%\Youdao\Dict4\skins\new-year\new-year-index\hover.png
• %Program Files%\Youdao\Dict4\skins\new-year\new-year-index\index.css
• %Program Files%\Youdao\Dict4\skins\new-year\new-year-index\index.png
• %Program Files%\Youdao\Dict4\skins\new-year\new-year-index\index_split.png
• %Program Files%\Youdao\Dict4\skins\new-year\new-year-index\new.png
• %Program Files%\Youdao\Dict4\skins\new-year\new-year-index\original_sound.png
• %Program Files%\Youdao\Dict4\skins\new-year\new-year-index\right.png
• %Program Files%\Youdao\Dict4\skins\new-year\new-year-index\wrong.png
• %Program Files%\Youdao\Dict4\skins\xinchun\xinchun.bmp
• %Program Files%\Youdao\Dict4\skins\xinchun\xinchun.css
• %Program Files%\Youdao\Dict4\skins\xinchun\xinchun.png
• %Program Files%\Youdao\Dict4\skins\xinchun\xinchun.xml
• %Program Files%\Youdao\Dict4\skins\xinchun\xinchun-index\button.png
• %Program Files%\Youdao\Dict4\skins\xinchun\xinchun-index\button_down.png
• %Program Files%\Youdao\Dict4\skins\xinchun\xinchun-index\button_hover.png
• %Program Files%\Youdao\Dict4\skins\xinchun\xinchun-index\down.png
• %Program Files%\Youdao\Dict4\skins\xinchun\xinchun-index\hover.png
• %Program Files%\Youdao\Dict4\skins\xinchun\xinchun-index\index.css
• %Program Files%\Youdao\Dict4\skins\xinchun\xinchun-index\index.png
• %Program Files%\Youdao\Dict4\skins\xinchun\xinchun-index\index_split.png
• %Program Files%\Youdao\Dict4\skins\xinchun\xinchun-index\new.png
• %Program Files%\Youdao\Dict4\skins\xinchun\xinchun-index\original_sound.png
• %Program Files%\Youdao\Dict4\skins\xinchun\xinchun-index\right.png
• %Program Files%\Youdao\Dict4\skins\xinchun\xinchun-index\wrong.png
• %Program Files%\Youdao\Dict4\skins\xp-blue\xp-blue.bmp
• %Program Files%\Youdao\Dict4\skins\xp-blue\xp-blue.css
• %Program Files%\Youdao\Dict4\skins\xp-blue\xp-blue.png
• %Program Files%\Youdao\Dict4\skins\xp-blue\xp-blue.xml
• %Program Files%\Youdao\Dict4\skins\xp-blue\xp-blue-index\button.png
• %Program Files%\Youdao\Dict4\skins\xp-blue\xp-blue-index\button_down.png
• %Program Files%\Youdao\Dict4\skins\xp-blue\xp-blue-index\button_hover.png
• %Program Files%\Youdao\Dict4\skins\xp-blue\xp-blue-index\down.png
• %Program Files%\Youdao\Dict4\skins\xp-blue\xp-blue-index\hover.png
• %Program Files%\Youdao\Dict4\skins\xp-blue\xp-blue-index\index.css
• %Program Files%\Youdao\Dict4\skins\xp-blue\xp-blue-index\index.png
• %Program Files%\Youdao\Dict4\skins\xp-blue\xp-blue-index\index_split.png
• %Program Files%\Youdao\Dict4\skins\xp-blue\xp-blue-index\new.png
• %Program Files%\Youdao\Dict4\skins\xp-blue\xp-blue-index\original_sound.png
• %Program Files%\Youdao\Dict4\skins\xp-blue\xp-blue-index\right.png
• %Program Files%\Youdao\Dict4\skins\xp-blue\xp-blue-index\wrong.png
• %Program Files%\Youdao\Dict4\skins\xp-cute\xp-cute.bmp
• %Program Files%\Youdao\Dict4\skins\xp-cute\xp-cute.css
• %Program Files%\Youdao\Dict4\skins\xp-cute\xp-cute.png
• %Program Files%\Youdao\Dict4\skins\xp-cute\xp-cute.xml
• %Program Files%\Youdao\Dict4\skins\xp-cute\xp-cute-index\button.png
• %Program Files%\Youdao\Dict4\skins\xp-cute\xp-cute-index\button_down.png
• %Program Files%\Youdao\Dict4\skins\xp-cute\xp-cute-index\button_hover.png
• %Program Files%\Youdao\Dict4\skins\xp-cute\xp-cute-index\down.png
• %Program Files%\Youdao\Dict4\skins\xp-cute\xp-cute-index\hover.png
• %Program Files%\Youdao\Dict4\skins\xp-cute\xp-cute-index\index.css
• %Program Files%\Youdao\Dict4\skins\xp-cute\xp-cute-index\index.png
• %Program Files%\Youdao\Dict4\skins\xp-cute\xp-cute-index\index_split.png
• %Program Files%\Youdao\Dict4\skins\xp-cute\xp-cute-index\new.png
• %Program Files%\Youdao\Dict4\skins\xp-cute\xp-cute-index\original_sound.png
• %Program Files%\Youdao\Dict4\skins\xp-cute\xp-cute-index\right.png
• %Program Files%\Youdao\Dict4\skins\xp-cute\xp-cute-index\wrong.png
• %Program Files%\Youdao\Dict4\intro\page_01_1.swf
• %Program Files%\Youdao\Dict4\intro\pre.html
• %Program Files%\Youdao\Dict4\intro\step1.html
• %Program Files%\Youdao\Dict4\intro\step2.html
• %Program Files%\Youdao\Dict4\intro\step3.html
• %Program Files%\Youdao\Dict4\intro\style.css
• %Program Files%\Youdao\Dict4\intro\images\arrow.png
• %Program Files%\Youdao\Dict4\intro\images\dot.gif
• %Program Files%\Youdao\Dict4\intro\images\sprite.jpg
• %Program Files%\Youdao\Dict4\intro\images\topbar_step_arrow.png
• %Program Files%\Youdao\Dict4\intro\images\topbar_step_bg.png
• %Program Files%\Youdao\Dict4\res\faq.html
• %Program Files%\Youdao\Dict4\res\updater.xsl
• %Program Files%\Youdao\Dict4\res\images\image-q1-2.gif
• %Program Files%\Youdao\Dict4\res\images\image-q3-11.gif
• %Program Files%\Youdao\Dict4\res\images\image-q3-21.gif
• %Program Files%\Youdao\Dict4\res\images\laba1.gif
• %Program Files%\Youdao\Dict4\res\images\title_back.gif
• %Program Files%\Youdao\Dict4\res\style\global.css
• %Program Files%\Youdao\Dict4\res\style\updater.css
• %AppDataLocal%\Yodao\DeskDict\CrashRpt\dmp_20241113110751.txt
• %Program Files%\Adobe\Reader 9.0\Reader\plug_ins\YodaoDict.api
• %Program Files%\Youdao\Dict4\guid.dat
• %AppDataLocal%\Yodao\DeskDict\config.ini
• %Application Data%\Microsoft\Crypto\RSA\{RSA}\{Random}
• %Cookies%\yodaodictproxyuser
• %AppDataLocal%\Yodao\DeskDict\tooltip_config.ini
• %AppDataLocal%\Yodao\DeskDict\CrashRpt\dmp_20241113110752.txt
• %Desktop%\有道词典.lnk
• %Programs%\有道\有道词典\启动有道词典.lnk
• %Programs%\有道\有道词典\有道单词本.lnk
• %Programs%\有道\有道词典\卸载有道词典.lnk
• %Programs%\有道\有道词典\有道词典主页.url
• %Programs%\有道\有道词典\帮助页面.url
• %Program Files%\Youdao\Dict4\uninst.exe
• %Program Files%\Youdao\Dict4\YoudaoToolbar.exe
• %AppDataLocal%\Yodao\DeskDict\CrashRpt\dmp_20241113110906.txt
• %AppDataLocal%\Yodao\DeskDict\dladdin\addin.ini
• %ProgramData%\Youdao\DeskDict\ddupdate\dictupdate.xml.part
• %AppDataLocal%\Yodao\DeskDict\cache\index.cab.md5.part

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Cookies% is the Internet Explorer browser cookies folder, which is usually C:\Documents and Settings\{user name}\Cookies on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Cookies on Windows Vista and 7, or C:\Users\{user name}\AppData\Local\Microsoft\Windows\INetCookies on Windows 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Desktop on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Programs% is the folder that contains the user’s program groups, which is usually C:\Windows\Start Menu\Programs or C:\Documents and Settings\{User name}\Start Menu\Programs on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu\Programs on Windows Vista, 7, and 8.. %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit), or C:\Documents and Settings\All Users on Windows Server 2003(32-bit), 2000(32-bit) and XP.)

It adds the following processes:

• "C:\Program Files\Youdao\Dict4\YodaoDict.exe" install
• "C:\Windows\System32\regsvr32.exe" "C:\Program Files\Youdao\Dict4\YoudaoGetWord32.dll" /s
• "C:\Windows\System32\regsvr32.exe" "C:\Program Files\Youdao\Dict4\YoudaoGetWord64.dll" /s
• "C:\Program Files\Youdao\Dict4\YodaoDict.exe" instreport
• "C:\Program Files\Youdao\Dict4\YoudaoToolbar.exe" /vendor=cidianindex /S /D=C:\Program Files\Youdao\Toolbar
• "C:\Program Files\Youdao\Dict4\RunDict.exe"
• "C:\Program Files\Internet Explorer\iexplore.exe" -nohome
• "C:\Program Files\Youdao\Dict4\YodaoDict.exe" start

Autostart Technique

This Potentially Unwanted Application adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
YodaoDict = "%Program Files%\Youdao\Dict4\RunDict.exe" -hide

Other System Modifications

This Potentially Unwanted Application modifies the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Yodao\
DeskDict
test = test

HKEY_LOCAL_MACHINE\SOFTWARE\Google\
Chrome\Extensions\{random}
path = %Program Files%\Youdao\Dict4\YDChromeTextExtractor.crx

HKEY_LOCAL_MACHINE\SOFTWARE\Google\
Chrome\Extensions\{random}
version = 1.2

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Office\Word\Addins\
YoudaoGetWord32.Connect
Description = 有道词典Office插件

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Office\Word\Addins\
YoudaoGetWord32.Connect
FriendlyName = 有道词典Office插件

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Office\Word\Addins\
YoudaoGetWord32.Connect
LoadBehavior = 3

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
YoudaoGetWord32.Connect.1
{Default} = Connect Class

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
YoudaoGetWord32.Connect.1/{CLSID}
{Default} = {CLSID}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
YoudaoGetWord32.Connect\CurVer
{Default} = YoudaoGetWord32.Connect.1

Propagation

This Potentially Unwanted Application does not have any propagation routine.

Backdoor Routine

This Potentially Unwanted Application does not have any backdoor routine.

Rootkit Capabilities

This Potentially Unwanted Application does not have rootkit capabilities.

Information Theft

This Potentially Unwanted Application does not have any information-stealing capability.

Other Details

This Potentially Unwanted Application adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Yodao

HKEY_LOCAL_MACHINE\SOFTWARE\Yodao\
DeskDict

HKEY_LOCAL_MACHINE\SOFTWARE\Google\
Chrome\Extensions\{random}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Office\Word\Addins\
YoudaoGetWord32.Connect

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Office\PowerPoint\Addins\
YoudaoGetWord32.Connect

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
YoudaoGetWord32.Connect.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
YoudaoGetWord32.Connect.1/CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
YoudaoGetWord32.Connect\CurVer

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{CLSID}

HKEY_LOCAL_MACHINE\SOFTWARE\Yodao\
DictLib

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
有道词典

It does the following:

• It is used to install the following software:
  • Youdao Dictionary 4.0
• It displays the following GUI prompting for installation of the product:
  
• It shows a license agreement before installing the product:
  
• It shows the selection of installation folder:
  
• It is able to install optional feature (Youdao Toolbar):
  
• It enables webpage "rating" function of Youdao Toolbar:
  
• It displays the progress bar and the installed components:
  
• After installation, it executes the installed product showing its main GUI:
  

It accesses the following websites to download its configuration/component files:

• http://{BLOCKED}oudao.com/icomplete.html?keyfrom=deskdict.4.0.22.8868&client=deskdict&id=e96181c5e57b89c4&vendor=unknown&in=&appVer=4.0.22.8868&appZengqiang=0
• {BLOCKED}ar.youdao.com
• {BLOCKED}dstatic.com
• {BLOCKED}oudao.com
• {BLOCKED}udao.com

NOTES:

It does not exploit any vulnerability.