We have received several reports about this adware/downloader. The messages that the adware was distributed in, appear to have certain common characteristics.
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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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