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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Encyclopedia GetVirusCard True 0

Test.Luis

 
Threat LevelSevere threatDamageSevereDistributionModerately widespread
Common name:Test.Luis
Technical name:Test.Luis
Threat level:Severe
Type:Worm
Effects:  

It spreads and affects other computers.

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Affected platforms:

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

Detection updated on:May 2, 2004
StatisticsNo

Brief Description 

    

Sasser.B is a worm that spreads itselfs through vulnerable systems affected by the LSASS exploit (MS04-011).

Sasser.B creates a copy of itself in the windows directory named AVSERVE2.EXE.

It also creates the following registry entry to ensure it is launched when the system is booted:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

avserve2exe = %windir%\avserve2exe

Sasser.B exploits the LSASS vulnerability to access the remote systems. More information about this exploit is available in the following URL:

http://www.microsoft.com/technet/security/bulletin/MS04-011.mspx

The worm uses 128 threads to scan random IP addresses. If the conection through port TCP 445 succeeds, the worm will check if the system is vulnerable. If it is, Sasser will open a shell through port TCP 9996 and will force an FTP conetion through port TCP 5554 to download the worm to the vulnerable system. The copy of the worm downloaded will be named %number%_up.exe, where %number% is a random number. On the other hand, the vulnerability  will use a buffer overflow to make the LSASS.EXE application crash. This might lead to a system crash.

SOLUTION

Click here to access the Online Support Center where you can find all the information to eliminate and protect your system from the worm.

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