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Wdialupd


Aliases:


Wdialupd
W32/Wdialupd.Adware, PornDial-177, Dialer.Porno.J,
TROJ_WDIALUPD.A, Trojan.Win32.Dialer, Dialer

Malware
Trojan
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.



Disinfection & Removal

Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



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



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