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Anti-ransomware Protection not detecting new file extensions on a volume

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ontap-9
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Applies to

  • ONTAP 9.10.1+
  • Anti-ransomware Protection(ARP)

Issue

After a simulated attack where the NAS files were encrypted and renamed, ONTAP does not detect the new .encrypted file extension:
 
Cluster01::> security anti-ransomware volume workload-behavior show -vserver svm01 -volume TestVol
Vserver                  : svm01
Volume                   : TestVol
File Extensions Observed : txt
Number of File Extensions Observed : 1
Number of Newly Observed File Extensions      : -

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