We have received several reports about this adware/downloader. The messages that the adware was distributed in, appear to have certain common characteristics.
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.
The 'From:' field always consists of a seemingly random sequence of alphanumeric characters followed by '@yahoo.com'. In the reports we received the length of the alphanumeric string was not constant.
The 'Subject:' field looks like those from common SPAM (unsolicited email), referring to porn and other miscellaneous topics.
In all the messages the attachment names are different, they can be the following:
action.zip adult_movies.zip my_videos.zip mymovie.zip yourfreemovie.zip
These ZIP files contain executables that are the actual installers/downloaders of the Wdialupd alware. The names of known Wdialupd executable files are:
1714.exe 2453.exe 2702.exe 5298.exe
When run, the Wdialupd asks a user to select his/her location and then attempts to download and activate additional components from Internet without asking for permission.
It posts information on the users location/language to the same address from where it tries to download files, nothing confidential appears to be posted.
The address is a hardcoded IP physically situated in Spain. At the time of this writing the address is unreachable.
The Wdialupd adware is detected by F-Secure Anti-Virus as:
Security risk or a "backdoor" program
because of its intrusiveness and because it appears to collect information about computer users.
It is advised to delete messages with Wdialupd downloaders and avoid running their executable files.
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