Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
The Yamanner worm activates by just opening an infected email message with Internet Explorer. To do this it uses a 0-day vulnerability in the Yahoo! Mail system.
Yamanner builds its email messages and sends them to the infected user's contacts. The sent emails look as follows:
The worm resides inside the email body. It also tries to open a web page in another browser window.
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