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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Nemsi.A

Threat LevelModerate threatDamageHighDistributionNot widespread
Common name:Nemsi.A
Technical name:W32/Nemsi.A
Threat level:Low
Type:Virus
Effects:  

It infects EXE files and causes a general protection fault to occur if an infected file is run on September 13.

Affected platforms:

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

First detected on:Oct. 8, 2004
Detection updated on:Oct. 8, 2004
StatisticsNo
Proactive protection:
Yes, using TruPrevent Technologies

Brief Description 

    

Nemsi.A is a virus that infects EXE files using the prepending method.

Though its author intented to destroy the information on the Master Boot Sector of the first hard drive when the system date reaches September 13, Nemsi.A does not work properly, and therefore it only causes a general protection fault (blue screen) to occur if an infected program is run on that date.

Nemsi.A does not spread using its own means, but it infects other files. It reaches computers when these infected files are distributed, which can enter computers through any of the typical means of tranmission, which include, among others, floppy disks, CD-ROMs, e-mail messages with attached files, Internet downloads, FTP, IRC channels, peer-to-peer (P2P) file sharing networks, etc.

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Visible Symptoms 

    

Nemsi.A is easy to recognize once it has infected the computer:

  • The infected EXE files have the following icon:

  • It causes a general protection fault if an infected file is run on September 13.