06-11-2021 09:42 AM
We are investigating alerts of this DNS signature for x1.c.lencr.org.
I'd expect that a match for a clear text string in a DNS Request that it is very unlikely this is a false detection.
However to get alerts so quickly after this signature creation, suggests we are either very unlucky or a very common public internet resource if causing this fly-by access. Anyone else receiving this threat alert shortly after an apparent WF update.
07-11-2021 11:41 PM
We have seen alert for x1.i.lencr.org as IOC for revil ransomware, although not seen anywhere else. Just chrome communicating to this domain. Still validating with support on this.
07-12-2021 03:11 PM - edited 07-12-2021 03:13 PM
This is a benign Let's encrypt domain. The URL categorization has been cleared.
There was an issue that was resolved in 9.0.10-h2, 9.1.6, and 10.0.2, that caused URL's previously in a malicious category to get 'stuck' in that malicious category in the Firewall's DP Cache. See https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA14u000000HCgjCAG
If you are running a PAN-OS version that is higher than the ones mentioned above, and you see the URL categorization stuck in a malicious category, even after it being cleared out to be Benign (verifiable in Test-A-Site), please open a Support case to have the issue investigated for root cause.
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