W32/Sasser Worm

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W32/Sasser Worm

Information about the W32/Sasser Worm:

W32/Sasser is a worm. This worm infects systems running on Windows 2000/XP/2003. The worm spreads through networks. This worm exploits LSASS vulnerability present in Windows as explained by Microsoft Security Bulletin MS04-011.

Upon execution of the worm, it modifies the Windows registry at the following location to run itself at the each startup.

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run

The worm opens ftp port 5554 and randomly scans for the computers with this flaw on the network. If found then the worm creates a remote access through TCP 9996 then downloads the file avserve.exe to Windows folder. The worm tries to copy itself to Windows System folder as <variable string>_up.exe. The worm keeps the ip address of the localhost in win.log under root of C: drive.

Microsoft has released a patch for this MS04-011 vulnerability. It can be downloaded from the following link:

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

Users should apply the patch downloaded from the link provided above to remove the vulnerability inherent in the system.

This worm first appeared on 30th April 2004.

Other names of W32/Sasser worm:

This worm is also known as W32.Sasser.Worm, W32/Sasser.worm, W32/Sasser-A

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Proland Software is the developer of Protector Plus range of anti virus software packages. Protector Plus anti virus is available for Windows XP, Windows Me/98/95, Windows NT/2000/2003 servers and workstations, MS-Exchange 2000/2003, MS-DOS and NetWare servers.

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