To create a filter:

1. In the Filter drop-down list, select Create new.
2. If you want to keep the filter as a separate resource, select the Save filter check box. In this case, you will be able to use the created filter in various services. This check box is cleared by default.
3. If you selected the Save filter check box, enter a name for the created filter resource in the Name field. Maximum length of the name: 128 Unicode characters.
4. In the Conditions settings block, specify the conditions that the events must meet:
   1. Click the Add condition button.
   2. In the Left operand and Right operand drop-down lists, specify the search parameters. Depending on the data source selected in the Right operand field, you may see fields of additional parameters for identifying the value to be passed to the filter. For example, when you select active list, you must specify the name of the active list, the entry key, and the entry key field.
   3. In the operator drop-down list, select an operator.

      Filter operators

      • =—the left operand equals the right operand.
      • <—the left operand is less than the right operand.
      • <=—the left operand is less than or equal to the right operand.
      • >—the left operand is greater than the right operand.
      • >=—the left operand is greater than or equal to the right operand.
      • inSubnet—the left operand (IP address) is in the subnet of the right operand (subnet).
      • contains—the left operand contains values of the right operand.
      • startsWith—the left operand starts with one of the values of the right operand.
      • endsWith—the left operand ends with one of the values of the right operand.
      • match—the left operand matches the regular expression of the right operand. The RE2 regular expressions are used.
      • hasBit—checks whether the left operand (string or number) contains bits whose positions are listed in the right operand (in a constant or in a list).

        The value to be checked is converted to binary and processed right to left. Chars are checked whose index is specified as a constant or a list.

        If the value being checked is a string, then an attempt is made to convert it to integer and process it in the way described above. If the string cannot be converted to a number, the filter returns False.

      • hasVulnerability—checks whether the left operand contains an asset with the vulnerability and vulnerability severity specified in the right operand.

        If you do not specify the ID and severity of the vulnerability, the filter is triggered if the asset in the event being checked has any vulnerability.

      • inActiveList—this operator has only one operand. Its values are selected in the Key fields field and are compared with the entries in the active list selected from the Active List drop-down list.
      • inDictionary—checks whether the specified dictionary contains an entry defined by the key composed with the concatenated values of the selected event fields.
      • inCategory—the asset in the left operand is assigned at least one of the asset categories of the right operand.
      • inActiveDirectoryGroup—the Active Directory account in the left operand belongs to one of the Active Directory groups in the right operand.
      • TIDetect—this operator is used to find events using CyberTrace Threat Intelligence (TI) data. This operator can be used only on events that have completed enrichment with data from CyberTrace Threat Intelligence. In other words, it can only be used in collectors at the destination selection stage and in correlators.
      • inContextTable—presence of the entry in the specified context table.
      • intersect—presence in the left operand of the list items specified in the right operand.
   4. If you want the operator to be case-insensitive, select the do not match case check box. The selection of this check box does not apply to the InSubnet, InActiveList, InCategory or InActiveDirectoryGroup operators. This check box is cleared by default.
   5. If you want to add a negative condition, select If not from the If drop-down list.

   You can add multiple conditions or a group of conditions.

5. If you have added multiple conditions or groups of conditions, choose a selection condition (and, or, not) by clicking the AND button.
6. If you want to add existing filters that are selected from the Select filter drop-down list, click the Add filter button. You can view the nested filter settings by clicking the button.