| 1.impact:
Possible theft of data and control of the targeted machine.
This Trojan also has the ability to scan machines and networks
for open ports, it can also redirect legitimate traffic to other
destinations. It can turn the infected host into an open proxy
server.
2.Detailed Information:
This Trojan affects the following operating systems:
Windows 95
Windows 98
Windows ME
Windows NT
Windows 2000
Windows XP
The Trojan changes system registry settings to add the Netbus
sever to programs normally started on boot. Due to the nature of
this Trojan it is unlikely that the attacker's client IP address
has been spoofed.
3.Attack Scenarios:
This Trojan may be delivered to the target in a number of
ways. This event is indicative of an existing infection being
activated. Initial compromise can be in the form of a Win32
installation program that may use the extension ".jpg" or ".bmp"
when delivered via e-mail for example.
4.Ease of Attack:
This is Trojan activity, the target machine may already be
compromised. Updated virus definition files are essential in
detecting this Trojan.
5.Corrective Action:
The manual removal of this Trojan should only be attempted by an
experienced Windows system administrator.
Edit the system registry to remove the extra keys or restore a
previously known good copy of the registry.
Affected registry keys are:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices\
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Registry keys added include:
Netbus Server Pro
PATCH "C:\windows\patch.exe /nomsg" - note: the entry may not
necessarily be called PATCH
NetBuster = ""
SysCopy = "command /c copy %windir%\\keyhook.dl_ %windir%\\*.dll
/Y"
Rundll32 = "rundll.dl_ /noadd"
Rundll = "regedit /s nbsetup2.reg"
Later versions may also add one of these registry entries:
HKEY_LOCAL_MACHINE/SOFTWARE/UltraAccess Networks/NetBus Server/
HKEY_CURRENT_USER/NetBus Server/
These entries should be deleted.
The files rundll.dl_ (note the underscore, this is important)
and nbsetup2.reg should be deleted if they exist.
Ending the process is necessary. A reboot of the infected
machine is recommended. |
