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| Symantec Security Response http://securityresponse.symantec.com |
VBS.Fireburn.A | 
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This .VBS worm uses Outlook and mIRC to propagate. It drops the rundll32.vbs file in the Windows folder. If mIRC is installed, it drops the Script.ini file in the mIRC program directory. On June 20th, the worm displays a message and disables the mouse and the keyboard.
| Also Known As: | VBS/Fireburn.worm, I-Worm.FireBurn |
| Type: | Worm |
| Infection Length: | 5,249 bytes |
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VBS.Fireburn.A uses Outlook and mIRC to propagate. It drops the file "Rundll32.VBS" in the Windows directory. If mIRC is installed, the worm drops the file "Script.INI" in the mIRC program folder. This worm modifies the following registry keys:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\MSrundll32 = "rundll32.vbs"
HKLM\Software\Microsoft\Windows\CurrentVersion\RegisteredOwner = "FireburN"
Using Outlook, the worm attempts to email itself to all addresses in the Microsoft Outlook Address Book. The attachment will have one of the following eight names:
- "Ultra-Hardcore-Bondage.JPG.vbs"
"Christina__NUDE!!!.JPG.vbs"
"CuteJany__BigTits!.GIF.vbs"
"MyGirlfriend__NUDE!.JPG.vbs"
"Aguiliera__NUDE!!.JPG.vbs"
"!Jany__Gets-fucked!.GIF.vbs"
"cute__EmmaPeel!!!.JPG.vbs"
"Julie17__xxx.GIF.vbs"
- subject="Moin, alles klar?"
body="Hi, wie geht's dir? Guck dir mal das Photo im Anhang an, ist echt geil ;) bye, bis dann.."
- subject="Hi, how are you?"
body="Hi, look at that nice Pic attached ! Watching it is a must ;) cu later..."
Finally, on June 20th, the virus disables the mouse and keyboard by modifying the following registry keys:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\Shut_Up = "rundll32 mouse,disable"
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\Shut_Up2 = "rundll32 keyboard,disable"
It then displays a message box with the following text:
I'm proud to say that you are infected by FireburN !
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 blended threat 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.
If applicable, restore the Script.ini file from backup; otherwise, delete this file. Delete all detected files. Remove the following entries in the registry:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\MSrundll32 = "rundll32.vbs"
