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1.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. Later versions are
capable of launching DDoS attacks.
2.Detailed Information:
This Trojan affects the following operating systems:
Windows 95
Windows 98
Windows ME
Windows NT
Windows 2000
Windows XP
No other systems are affected. This is a windows exceutable that
makes changes to the system registry, Win.ini and System.ini.
When first executed the Trojan replicates itself and in most
cases, gives the copy a random name. This Trojan may use the
file extensions ".exe" or ".dll".
The Trojan changes system startup files and registry settings to
add the Doly sever to programs normally started on boot.
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:
This is a particularly difficult Trojan to remove and should
only be attempted by an experienced Windows 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_CLASSES_ROOT\exefile\shell\open\command
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Current
Version\Run
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Current Version\RunServices
HKEY_LOCAL_MACHINE\Hardware\Data
HKEY_LOCAL_MACHINE\Hardware\Enum
HKEY_LOCAL_MACHINE\Software\Microsoft\DirectXMedia
Registry keys added are:
HKEY_CLASSES_ROOT\.dl
Removal of the replicant is also required, look for files ending
in ".exe" or ".dll" in the <drive>:\Windows\ or
<drive>:\Windows\System\ folders that use alphanumeric file
names. The name of the replicant may be in one of the registry
keys above.
A machine reboot is required to clear the existing process from
running in memory. |
