Summary
Files detected as HTML/Postcard.N@troj are EML files that state that the recipient has received a greeting card.
The recipient is encouraged to click on a link or to visit a website and enter their eCard number to view the message.
Removal
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.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
Check for the latest database updates
First, check if your F-Secure security program is using the latest updates, then try scanning the file again.
Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.
Technical Details
Files that are detected as HTML/Postcard.N@troj are EML files that state that the recipient has received a greeting card from a friend, relative, or classmate. The recipient is encouraged to click on a link or to visit a website and enter their eCard number to view the message.
When the user click this link, another page will appear stating that a new browser feature is currently being tested. The recipient is asked to click another link pointing to a file, usually named ECARD.EXE. We are detecting these files as Email-Worm.Win32.Zhelatin.
The website seems to have obfuscated javascript that uses exploits to download the file to the recipient's machine. Currently, these page are detected as HTML/IESlice.B@troj.
An example message:
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