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Suspicous Firewall Rules, Unusual Accounts, and Svchost Oddness.

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#1 spenca57


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Posted 15 March 2018 - 01:08 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. Furthermore, I have noticed in recent netstat -afb queries there are connections being made from svchost.exe to cloudproxy10003.sucuri.net. I'm not sure if this is unusual or relevant. Anyways, thank you for reading and hopefully replying. 

Edited by spenca57, 15 March 2018 - 01:09 AM.

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