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Suspicous Firewall Rules

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#1 spenca57


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Posted 15 March 2018 - 01:03 AM

Tonight, while considering improving my security policy for my Windows system I decided to check the firewall rules to perhaps bolster them. When I did so I noticed some unusual rules that had recently been set. The rules had names like @{Windows.ContactSupport_10.0.15063.0_neutral_neutral_cw5n1h2txyewy?ms-resource://Windows.ContactSupport/Resources/appDisplayName} and @{Microsoft.Windows.Cortana_1.8.12.15063_neutral_neutral_cw5n1h2txyewy?ms-resource://Microsoft.Windows.Cortana/resources/PackageDisplayName} and @{Microsoft.PPIProjection_10.0.15063.0_neutral_neutral_cw5n1h2txyewy?ms-resource://Microsoft.PPIProjection/resources/ProductName}. They are inbound rules, I have attached screenshots bellow. What I thought was most unusual about these rules was that the local user owner was an unusual name like S-1-5-21-293847239847 (random sequence of numbers). I have seen these similar suspicious accounts when checking the permissions on Linux ISOs I have downloaded. I have also included a screenshot of these. An unusual account named S-1-5-21-34817632187 has read permissions on every ISO I download. Is this normal? Could this be an IOC? If so, what can I do? I have attached screenshots of all of this, however the screenshots in my posts seems to be disappearing for some reason. This is a bit off topic but what is the best way to improve my firewall security? I want to take the most aggressive stance possible, certainly don't mind if it's annoying, but I want as much security as possible from my firewall. Thanks for your time. 

Edited by spenca57, 15 March 2018 - 01:10 AM.

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Posted 17 September 2018 - 10:48 PM

You can always block them and unblock if issues arise. 

S-x-x-xx-xxxxxxxxxxx is called a SID.

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