high
Summary
Summary
Action- More Information
| Included in our products from | June 2004 (3.82) |
|---|---|
| Protection available since | 11 May 2004 11:15:46 (GMT) |
| Detected by | All Sophos products |
Action
- Summary
- Action
- More Information
Please follow the instructions for removing worms.
Windows NT/2000/XP/2003
In Windows NT/2000/XP/2003 you will also need to edit the following registry entry. The removal of this entry is optional in Windows 95/98/Me. Please read the warning about editing the registry.
At the taskbar, click Start|Run. Type 'Regedit' and press Return. The registry editor opens.
Before you edit the registry, you should make a backup. On the 'Registry' menu, click 'Export Registry File'. In the 'Export range' panel, click 'All', then save your registry as Backup.
Locate the HKEY_LOCAL_MACHINE entry:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
nvpatch = napatch.exe
and delete it if it exists.
Close the registry editor.
More Information
W32/Sasser-F is a network worm which spreads by exploiting a Microsoft
LSASS vulnerability.
The worm copies itself to the Windows folder as NAPATCH.EXE and sets the
following registry entry to auto-start on user logon:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
nvpatch = napatch.exe
W32/Sasser-F attempts to connect to random IP addresses on ports TCP/445
and TCP/9996 and then exploit the LSASS vulnerability. If successful an FTP
script is uploaded to and executed on the remote computer which then connects back on port 5554 to download a copy of the worm via FTP.
W32/Sasser-F may cause the program LSASS.EXE to terminate which generally
prompts Windows to shutdown and reboot. However W32/Sasser-F attempts to prevent a system shutdown.
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