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Backdoor.BackOrifice |
1.Summary:
Backdoor.BackOrifice is a Trojan Horse.
Server Port: 31337 although in later versions this port can be
changed
to a value between 1 and 65535
Protocol: UDP although in later versions TCP can also be used
2.Impact:
Possible theft of data and control of the targeted machine
leading to a
compromise of all resources the machine is connected to. This
Trojan
also has the ability to delete data, steal passwords and disable
the
machine.
3.Detailed Information:
This Trojan affects the following operating systems:
Windows 95
Windows 98
Windows ME
Windows NT
The Trojan changes system registry settings to add the
BackOrifice 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.
The default name of the server application is UMGR32, which can
be
changed on first use. The new application may be installed in
the system
or system32 direcory and the original may also be deleted.
Event messages relating to activity from this Trojan are:
4.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.
5.Corrective Action:
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\SYSTEM\CurrentControlSet\Services
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServices
Registry keys added may vary, look for spurious entries in the
above
locations.
BackOrifice may hide the process from viewing inthe Windows task
manager. A reboot of the infected machine is recommended. |
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