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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Zasi

Threat LevelModerate threatDamageHighDistributionNot widespread
Common name:Zasi
Technical name:Trj/Downloader.Zasi
Threat level:Low
Alias:Downloader-BN.b TrojanDownloader:Win32/Zasil
Type:Trojan
Effects:  It causes computers to block.
Affected platforms:

Windows XP/2000/NT/ME/98/95

Detection updated on:June 25, 2003
StatisticsNo

Brief Description 

    

Zasi is a Trojan that has variable effects, as it uses files that it downloads from remote servers. Depending on the file downloaded, this Trojan will have different effects.

The e-mail message sent out by Zasi passes itself off as a Microsoft security bulletin. The message text also invites the user to visit a web page and download a security patch for Windows operating systems.

When the user accesses the link included in the message, a series of files containing the virus code are downloaded to the computer.

Visible Symptoms 

    

The message sent out by Zasi is easy to recognize, as it has the following characteristics:

  • Subject:
    [spam] IMPORTANT!! Critical security hole in Windows!
  • Message:
    Dear Windows User!
    New Windows 9x/2000/NT/XP critical patch has been released.
    Due to security problems, your system needs to be updated as earlier as possible.
    You can download an update patch on Windows Update site: http://www.windows-update.com
    Best regards,
    Windows Update Group