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Threat Detected Warnings

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Threat Detected Warnings

I keep getting alerts that my PC is under attack and comcast has blocked the threat.  It says they blocked a known malicious computer from overseas.   The message says it blocked IP from Seychellse, France, Greece, and unknown.    I also use remote desktop and have that secured and changed the port to a non standard port and do not use 3389.  I have also closed 3389.   I still get the occassional attack on the custom port.

I have formatted out and reinstalled and confimed the drives and RAM have nothing malicious on them going out.    So are these bots just trying everything on the xfinity networks looking for an unsecured machine or should I be concerned...