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hack-a-tack |
1.Impact:
Possible theft of data via download, upload of files,
execution of files and reboot the targeted machine.
2.Detailed Information:
The Trojan changes system registry settings to add the
hack-a-tack server 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.
This Trojan is commonly used to install other Trojan programs.
The server portion opens TCP ports 31785 and 31787 and UDP ports
31789 and 31791 by default to establish a connection between
client and server. The ports may then be configured by the
attacker to use something other than these defaults.
Affected Systems:
Windows 95
Windows 98
Windows ME
Windows NT
Windows 2000
Windows XP
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.
The Trojan server is located at <drive>:\WINDOWS\Expl32.exe.
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\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\
Registry keys added are:
Explorer32 ="<drive>:\windows\Expl32.exe"
Configuration Wizard = "<drive>:\windows=cfgwiz32.exe"
Removal of this entry is required.
Delete the file(s) <drive>:\WINDOWS\Expl32.exe and
<drive>:\windows=cfgwiz32.exe
Ending the Trojan process is also necessary. A reboot of the
infected machine is recommended. |
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