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CONTAP-438357: Newly observed file extensions seen on volume with no ARW attack

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ontap-9
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core
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Issue

  • Some file extersions are reported under "Newly Observed File Extensions" in the workload-behavior output:

::> security anti-ransomware volume workload-behavior show -vserver SVM1 -volume vol_01
                                         Vserver: SVM1
                                          Volume: vol_01
                        File Extensions Observed: pdf, rtf, txt, tmp, jpg,
                                                  wfs, xlsx, JPG, lms, wav,
                                                  pptx, xls, xml
              Number of File Extensions Observed: 23
 Historical Statistics
              High Entropy Data Write Percentage: 98
   High Entropy Data Write Peak Rate (KB/Minute): 340936
              File Create Peak Rate (per Minute): 128
              File Delete Peak Rate (per Minute): 294
              File Rename Peak Rate (per Minute): 10
 Surge Observed
                                  Surge Timeline: -
              High Entropy Data Write Percentage: -
   High Entropy Data Write Peak Rate (KB/Minute): -
              File Create Peak Rate (per Minute): -
              File Delete Peak Rate (per Minute): -
              File Rename Peak Rate (per Minute): -
                  Newly Observed File Extensions: abc, xyz, pqr
        Number of Newly Observed File Extensions: 310, 72, 238

 
  • However, there is no attack reported for that volume:

USNAZCNO::> security anti-ransomware volume show -vserver SVM1 -volume vol_01
      Vserver Name: SVM1
       Volume Name: vol_01
             State: enabled
Dry Run Start Time: -
Attack Probability: none
   Attack Timeline: -
 Number of Attacks: -

 
  • These extensions are not cleared even after marking them as false positives:

::> security anti-ransomware volume attack clear-suspect -vserver SVM1 -volume vol_01 -false-positive true -extensions abc, xyz, pqr

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