Happy99.Worm

When executed, the infected program opens a window entitled "Happy New Year 1999 !!" and shows a fireworks display to disguise its installation. This worm sends itself to other users when the infected computer is online.



The following error messages can be symptoms of Happy99.Worm:

"MSIMN caused an invalid page fault in module Kernel32.dll"
"MSIMN caused an invalid page fault in module unknown"
"Explorer caused an invalid page fault in module Mailnews.dll at 014f:62060a0f"
"Outlook caused an Invalid Page Fault in module Unknown"
"MSIMN caused an invalid page fault in module Inetcomm.dll"

For additional information on these errors, see the Microsoft Knowledge Base article OLEXP: Error Message: "Invalid Page Fault in Kernel32.dll" with Happy99.exe Virus, Article ID: Q221486

Protection

• Initial Rapid Release version January 28, 1999
• Latest Rapid Release version July 19, 2008 revision 019
• Initial Daily Certified version January 28, 1999
• Latest Daily Certified version July 19, 2008 revision 018
• Initial Weekly Certified release date January 28, 1999

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment

Wild

• Wild Level: Low
• Number of Infections: More than 1000
• Number of Sites: More than 10
• Geographical Distribution: High
• Threat Containment: Easy
• Removal: Moderate

Damage

• Damage Level: Low

Distribution

• Distribution Level: Medium