Threat Description

Wdialupd

Details

Aliases: Wdialupd, W32/Wdialupd.Adware, PornDial-177, Dialer.Porno.J,, TROJ_WDIALUPD.A, Trojan.Win32.Dialer, Dialer
Category: Malware
Type: Trojan
Platform: W32

Summary


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



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More

Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for further assistance.



Technical Details


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 e-mail), 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.





Description Details: Ero Carrera, Alexey Podrezov; F-Secure Corp.; May 26th-June 9th, 2003


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