high
Summary
Summary
Action- More Information
| Protection available since | 3 June 2004 20:32:39 (GMT) |
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| Detected by | All Sophos products |
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Action
- Summary
- Action
- More Information
Please follow the instructions for removing worms.
Download and install the Microsoft patch mentioned above.
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\
WinUpdate = <Windows system folder>\<random name>.exe
and delete it if it exists.
Close the registry editor.
More Information
W32/Korgo-B is a network worm using the LSASS exploit to propagate. When executed the worm copies itself to the Windows system folder using a randomly generated name and creates the following registry entry so that the worm starts when a user logs on:
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
WinUpdate = <Windows system folder>\<random name>.exe
During infection the worm will also use the temporary registry value
HKLM\Software\Microsoft\Wireless\
Server = 1
W32/Korgo-B scans random IP addresses attempting to exploit them, the results of the scans are transmitted to one of several IRC servers and channels.
W32/Korgo-B includes a backdoor component which can be used to upload and run files on the infected computer.
Microsoft have issued a patch for the LSASS vulnerability, which can be downloaded from Microsoft Security Bulletin MS04-011.
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