WORM_QQPASS.BFN

This worm arrives via removable drives. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It steals certain information from the system and/or the user.

It sends gathered information to a predetermined email address using its own Simple Mail Transfer Protocol (SMTP) engine.

Arrival Details

This worm arrives via removable drives.

It 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 worm drops the following copies of itself into the affected system and executes them:

• %Program Files%\Windows Media Player\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\autorun.inf\svchost.exe¡¡

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

It drops the following file(s)/component(s):

• {Malware Path}\CQ.bat - Non-malicious; Kills qq.exe (IM QQ) then deletes itself
• {Malware Path}\temp.bat - Non-malicious; Modifies the Access Control List by denying everyone access to change (write) Windows Media Player then deletes itself
• %User Temp%\E_N4\internet.fne - Non-malicious
• %User Temp%\E_N4\krnln.fnr - Non-malicious
• %User Temp%\E_N4\Md5.fne - Also detected as WORM_QQPASS.BFN
• %User Temp%\E_N4\eAPI.fne - Non-malicious

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

It creates the following folders:

• %User Temp%\E_N4
• %System Root%\autorun.inf
• %System Root%\autorun.inf\ÎļþÃâÒß.
• %Program Files%\autorun.inf
• %Program Files%\autorun.inf\ÎļþÃâÒß.
• %Program Files%\Windows Media Player\autorun.inf
• %Program Files%\Windows Media Player\autorun.inf\ÎļþÃâÒß.

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Autostart Technique

This worm modifies the following registry entry(ies) to enable its automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = "Userinit,"%Program Files%\Windows Media Player\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\{random character}\autorun.inf\svchost.exe¡¡"

(Note: The default value data of the said registry entry is "%System%\userinit.exe,".)

Other System Modifications

This worm adds the following registry keys:

HKEY_CLASSES_ROOT\.exe¡¡

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.exe¡¡

HKEY_CURRENT_USER\Software\LoveQ

It adds the following registry entries as part of its installation routine:

HKEY_CLASSES_ROOT\.exe¡¡
{Default} = "exefile"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.exe¡¡
{Default} = "exefile"

HKEY_CURRENT_USER\Software\LoveQ
first = "closeQQ"

Information Theft

This worm steals the following information:

• User log-in credentials for IM QQ

Stolen Information

This worm sends gathered information to a predetermined email address using its own Simple Mail Transfer Protocol (SMTP) engine.

NOTES:

It drops copies of itself using the folder names in the root directory of all physical and removable drives then sets the attributes of the original folders to Hidden. The dropped copies' icon looks like a folder. By doing so, it tricks users into clicking the dropped copies. When a dropped copy is executed, the original folder opens to make the user think that it has opened the original folder.

Its added folders are hidden. The autorun.inf folders it adds are a shortcut to Recycle Bin.

It monitors the following websites of QQ, a popular Chinese instant messaging application, to steal user-entered login details:

• http://{BLOCKED}m.qq.com/?ptlang=2052&ADUIN=0&ADSESSION=0&ADTAG=CLIENT.QQ.2173_NewAccount_Btn
• https://{BLOCKED}t.qq.com/cgi-bin/auth_forget?ptlang=2052&ADUIN=0&ADSESSION=0&ADTAG=CLIENT.QQ.2173_ForgetPsw