Threat Description



Category: Malware
Type: Virus
Platform: W32
Aliases: Yesmile, Smile


This is a multipartite virus which infects MBRs on hard drives and COM and EXE files when they are executed. Occasionally the virus tries to play something (probably laughter) from the PC speaker. Yesmile is a stealth virus, so you can't see it in files or boot sectors when it is resident in memory.

There are several variants of this virus. The 5504 variant was distributed in a dropper called LAUGH.EXE in usenet newsgroups in January 1996. Do note that F-Secure anti-virus products do not specifically detect the LAUGH.EXE dropper: you will have to delete it manually.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.

Description Details: Mikko Hypponen, F-Secure


Suspect a file or URL was wrongly detected? Submit a sample to our Labs for analysis

Submit Now

Give And Get Advice

Give advice. Get advice. Share the knowledge on our free discussion forum.

Learn More