x
48h OFFER
If you're already a customer of
our homeusers protection,
renew now with a 50% off
RENEW NOW
x
SPECIAL OFFER
If you're already a customer of
our homeusers protection,
renew now with a 50% off
RENEW NOW
x
HALLOWEEN OFFER
take advantage of our
terrific discounts
BUY NOW AND GET A 50% OFF
x
CHRISTMAS OFFER
Buy the best antivirus
at the best price
BUY NOW AND GET A 40% OFF
x
SPECIAL OFFER
Buy the best antivirus
at the best price
BUY NOW AND GET A 50% OFF
x
BLACKFRIDAY OFFER
Buy the best antivirus
at the best price
TODAY ONLY UP TO 70% OFF
x
CYBERMONDAY OFFER
Buy the best antivirus
at the best price
(Only for homeusers)
TODAY ONLY UP TO 70% OFF
Active Scan. Scan your PC free
Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Mydoom.Z

Threat LevelModerate threatDamageHighDistributionNot widespread
Common name:Mydoom.Z
Technical name:W32/Mydoom.Z.worm
Threat level:Low
Type:Worm
Effects:  

It downloads and installs a backdoor. It ends processes belonging to security tools, and denies access to antivirus update websites.

Affected platforms:

Windows 2003/XP/2000/NT/ME/98/95

First detected on:Sept. 15, 2004
Detection updated on:Sept. 15, 2004
StatisticsNo

Brief Description 

    

Mydoom.Z is a worm that connects to several websites in order to download and install a file belonging to a backdoor, on the affected computer.

In addition, Mydoom.Z ends processes belonging to several antivirus programs and firewalls, among other security tools. This leaves the affected computer vulnerable to the attack of other malware.

It also denies access to certain antivirus websites, in order to prevent these programs from being updated or from detecting new threats.

Mydoom.Z spreads via e-mail in a message with variable characteristics, and through the peer-to-peer (P2P) file sharing program KaZaA.

Visible Symptoms 

    

Mydoom.Z is difficult to recognize, as it does not display any messages or warnings that indicate it has reached the computer.