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Description:
Note: This worm is covered by the Red alert on the SASSER family of worms (variants A, B, and C).
This worm exploits the Windows LSASS vulnerability, which is a buffer overrun that allows remote code execution and enables an attacker to gain full control of the infected system. This vulnerability is discussed in detail in the following pages:
To propagate, it scans for vulnerable systems at TCP port 445 and sends a specially-crafted packet to produce a buffer overflow on LSASS.EXE. The packet runs a remote shell that opens port 9996. This worm commands the remote shell to download its copy from the original infected source via port 5554 using FTP.
This worm can cause LSASS to crash and force Windows to restart. In this case, the following message boxes may appear:
Notes on Windows 2003 Server:
- Analysis and tests done on this malware show that it can execute and create registry entries on Windows 2003 server, but it fails to exploit the LSASS service in the said operating system version.
- Although Microsoft reports that the Windows 2003 Server is also vulnerable to the LSASS exploit, there may exist a code error within the malware exploit packet that prevents it from exploiting the LSASS vulnerability on the said platform.
The following article provides a thorough look into the different events that shaped Sasser's emergence and gives an extensive discussion about its implications:
For additional information about this threat, see:
Solution
Technical Details
Description created: May. 2, 2004 6:14:23 AM GMT -0800
Description updated: May. 6, 2004 5:21:37 AM GMT -0800
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