Event ID - 666

Port No666
Service NameReverseTrojan
RFC Doc0
ProtocolTCP
DescriptionIt has two components - the server and the client. The server component installs on or infects target systems, where it receives and executes commands that are sent using the client component.
A remote user running the client component can access and manipulate machines infected by its server counterpart. This user may delete files from infected machines and log keystrokes made on these machines.
Reference LinkReverseTrojan
AttackSolution:

This procedure terminates the running malware process from memory. You will need the name(s) of the file(s) detected earlier.
Open Windows Task Manager.
On Windows 9x/ME systems, press
CTRL+ALT+DELETE
On Windows NT/2000/XP systems, press
CTRL+SHIFT+ESC, and click the Processes tab.
In the list of running programs*, locate the malware file or files detected earlier.
Select one of the detected files, then press either the End Task or the End Process button, depending on the version of Windows on your system.
Do the same for all detected malware files in the list of running processes.
To check if the malware process has been terminated, close Task Manager, and then open it again.
Close Task Manager.

*NOTE: On systems running Windows 9x/ME, Task Manager may not show certain processes. You may use a third party process viewer to terminate the malware process. Otherwise, continue with the next procedure, noting additional instructions.

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