W32.Sasser.E.Worm is a minor variant of W32.Sasser.Worm. It attempts to exploit the LSASS vulnerability, described in
Microsoft Security Bulletin MS04-011, and spreads by scanning randomly selected IP addresses for vulnerable systems.
W32.Sasser.E.Worm differs from W32.Sasser.Worm as follows:
- Uses a different mutex: SkynetNotice.
- Uses a different file name: lsasss.exe.
- Creates a different value in the registry: "lsasss.exe"
- Uses different port numbers, used by FTP server and the remote shell: 1023 and 1022.
- After 2 hours of running it displays a message.
- It deletes the values from the registry, which are known to be installed by Trojan.Mitglieder, W32.Beagle.W@mm, and W32.Beagle.X@mm.
- The name of the file retrieved from the FTP server is followed by _update.exe.
- The worm logs data into the file C:\ftplog.txt.
- Has an updated routine for finding vulnerable computers. W32.Sasser.E.Worm sends an ICMP echo request before attempting to make a connection. This change may prevent the worm from properly executing on Windows 2000 systems.
W32.Sasser.E.Worm can run on, but not infect, Windows 95/98/Me computers. Although these operating systems cannot be infected, they can still be used to infect vulnerable computers.
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