Mydoom.M worm creates encrypted log files and sometimes sends them out instead of its own code due to a bug. As a result, the encryped data files are sent in a ZIP archive inside emails. The files have random (encrypted) content, they are about 1.1 or 1.2 kilobytes long. F-Secure Anti-Virus detects them as "I-Worm.Mydoom.m.log". Please delete messages and files that are detected as such by F-Secure Anti-Virus.
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.
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