Lets Encrypt Internal Blacklist block

[jdashn 9]

As of this morning i'm getting a lot of alerts across the orginization for:

hxxp://ocsp.int-x3.letsencrypt.org/MFMwUTBPME0wSzAJBgUrDgMCGgUABBR+5mrncpqz/PiiIGRsFqEtYHEIXQQUqEpqYwR93brm0Tm3pkVl7/Oo7KECEgRY8NzrWAjZ4J4grl19QqsePQ=

For each alert the last bit of the address changes, but this part is the same:
hxxp://ocsp.int-x3.letsencrypt.org/MFMwUTBPME0wSzAJBgUrDgMCGgUABBR+5mrncpqz/PiiIGRsFqEtYHEIXQQUqEpqYwR93brm0Tm3pkVl7/Oo7KECEg

They all also have a target address of :

104.91.166.211

Just wondering if there is more information on this, what might be causing it, if this is an indicator of a primary infection, etc.

 

Thank you!!

Jdashn

 

[NFear 1]

Same here. One of the applications I use for a long time obviously tries to validate a letsencrypt certificate via OCSP. Looks like a false entry has made it to the internal ESET blacklist.

Edited December 1, 2020 by NFear

[Marcos 3,574]

The FP should be already resolved. You can enforce update of the blacklist by rebooting the machine.

[zetafiddler 0]

Same problem here.  Either X-Plane 11 or some plug-in for it attempts to contact "...ocsp.int-x3.letsencrypt.org..." but gets blocked by ESET Internet Security.

Must be recent change as I've not changed X-Plane for several weeks.

 

 

[jdashn 9]

Awesome!! thanks a ton to both of you for your quick replies!

[zetafiddler 0]

Thanks Marcos, awesome response!