Email.0Day.Malware is a generic detection name for new, undefined malware. E-mail worms at the beginning of their spam run are an example of malware that could be detected as such.
The detection is made by the Zero-Hour Protection implemented in some of F-Secure's Anti-Virus products.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
Various F-Secure Anti-Virus products detect newly created e-mail-based malware usingZero Hour Protection only moments after they begin spreading. Typically these viruses and worms have not yet been analyzed; it is the Zero Hour Protection techniques that confirm the inspected e-mail contains new malware.
At this stage of detection, the malware has not yet been included to the more traditional virus definition databases. It does not yet have a signature. As soon as the detection has been added to the definition updates, the name will be changed from the generic Email.0Day.Malware to the actual name of the malware. If the e-mail messages infected with Email.0Day.Malware are rescanned at a later date the infection will likely have a different name.
Every new malware detected by F-Secure Anti-Virus products utilizing Zero Hour Protection use the generic name of Email.0Day.Malware. Multiple viruses or worms are detected under this name.
If at all possible, please provide a sample of the malware detected for analysis by our Security Labs. This will assist us in creating signature definitions to include in our detection databases.
Instructions on how to submit samples to F-Secure can be found from our Support Pages.