Discovered: October 3, 2007
Updated: October 3, 2007 4
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Also Known As: New Backdoor4-b [McAfee], W32/Autorun.worm.dl [McAfee]
Type: Worm
Infection Length: 90,112 bytes
Systems Affected: Windows 98, Windows 95, Windows XP, Windows Me, Windows Vista, Windows NT, Windows Server 2003, Windows 2000
When the worm executes it creates the following files:
- %CurrentFolder%\autorun.inf
- %System%\UpDateWinc.exe
- %System%\UpDateWind.exe
- %Windir%\LogBoy.log
- %SystemDrive%\a1.exe
- %SystemDrive%\pass1.txt
- %SystemDrive%\tem.exe
- %SystemDrive%\temp1.bat
The worm also creates the following file:
%DriveLetter%\NTDETECT.exe
Next it creates the following file so that it executes whenever the drive is accessed:
%DriveLetter%\autorun.inf
Next, it creates the following registry entry:
HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows\"run" = "%System%\UpDateWinc.exe"
The worm records the following on the compromised computer:
- Yahoo! Messenger user names and passwords
- Keystrokes
- Mouse clicks
- Title of active window
The worm emails the gathered information to the remote attacker using the following SMTP server:
mx1.mail.yahoo.com
The email has the following characteristics:
From:
[ برای مشاهده لینک ، با نام کاربری خود وارد شوید یا ثبت نام کنید ]
To:
[ برای مشاهده لینک ، با نام کاربری خود وارد شوید یا ثبت نام کنید ]
Subject: --- .:. BoyDread Full Trojan

.:. ---
It stores the above information in the following file:
%Windir%\LogBoy.log
It also drops the following file on to the compromised computer:
%SystemDrive%\a1.exe (
[ برای مشاهده لینک ، با نام کاربری خود وارد شوید یا ثبت نام کنید ]
)
Recommendations
Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":
- Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.
- If a
[ برای مشاهده لینک ، با نام کاربری خود وارد شوید یا ثبت نام کنید ]
exploits one or more network services, disable, or block access to, those services until a patch is applied.
- Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services (for example, all Windows-based computers should have the current Service Pack installed.). Additionally, please apply any security updates that are mentioned in this writeup, in trusted Security Bulletins, or on vendor Web sites.
- Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
- Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.
- Isolate infected computers quickly to prevent further compromising your organization. Perform a forensic analysis and restore the computers using trusted media.
- Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
Writeup By: Sean Kiernan