Simple correlation rules

Simple correlation rules are used to define simple sequences of events.

The correlation rule window contains the following configuration tabs:

• General—used to specify the main settings of the correlation rule. On this tab, you can select the type of correlation rule.
• Selectors—used to define the conditions that the processed events must fulfill to trigger the correlation rule. Available settings vary based on the selected rule kind.
• Actions—used to set the triggers that will activate when the conditions configured in the Selectors settings block are fulfilled. A correlation rule must have at least one trigger. Available settings vary based on the selected rule type.

General tab

• Name (required)—a unique name for this type of resource. Must contain 1 to 128 Unicode characters.
• Tenant (required)—the tenant that owns the correlation rule.
• Type (required)—a drop-down list for selecting the type of correlation rule. Select simple if you want to create a simple correlation rule.
• Propagated fields (required)—event fields used for event selection. If the selector (see below) is triggered, these fields will be written to the correlation event.
• Rate limit—maximum number of times a correlation rule can be triggered per second. The default value is 100.

  If correlation rules employing complex logic for pattern detection are not triggered, this may be due to the specific method used to count rule triggers in KUMA. In this case, try to increase the value of Rate limit to 1000000, for example.

• Priority—base coefficient used to determine the importance of a correlation rule. The default value is Low.
• Description—the description of a resource. Up to 4,000 Unicode characters.

Selectors tab

A rule of the simple kind can have only one selector for which the Settings and Local variables tabs are available.

The Settings tab contains settings with the Filter settings block:

• Filter (required)—used to set the criteria for determining events that should trigger the selector. You can select an existing filter from the drop-down list or create a new filter.

  Creating a filter in resources

  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. The name must contain 1 to 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 that you need to use to define the value that will be passed to the filter. For example, when choosing active list you will need to specify the name of the active list, the entry key, and the entry key field.

     3. In the operator drop-down list, select the relevant 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.
        • inContextTable checks whether or not an entry exists in the context table. This operator has only one operand. Its values are selected in the Key fields field and are compared with the values of entries in the context table selected from the drop-down list of context tables.
        • 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.
     4. If necessary, select the do not match case check box. When this check box is selected, the operator ignores the case of the values.

        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.
     6. You can add multiple conditions or a group of conditions.
  5. If you have added multiple conditions or groups of conditions, choose a search 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.

  Filtering based on data from the Extra event field

  Conditions for filters based on data from the Extra event field:

  • Condition—If.
  • Left operand—event field.
  • In this event field, you can specify one of the following values:
    • Extra field.
    • Value from the Extra field in the following format:

      Extra.<field name>

      For example, Extra.app.

      A value of this type is specified manually.

    • Value from the array written to the Extra field in the following format:

      Extra.<field name>.<array element>

      For example, Extra.array.0.

      The values in the array are numbered starting from 0.

      A value of this type is specified manually.

      To work with a value from the Extra field at depth 3 and below, use backquotes ``. For example, `Extra.lev1.lev2.lev3`.

  • Operator – =.
  • Right operand—constant.
  • Value—the value by which you need to filter events.

On the Local variables tab, use the Add variable button to declare variables that will be used within the limits of this correlation rule.

The order of conditions specified in the selector of the correlation rule is significant and affects system performance. We recommend putting the most unique condition in the first place in the selector.

Consider two examples of selectors that select successful authentication events in Microsoft Windows.

Selector 1:

Condition 1. DeviceProduct = Microsoft Windows

Condition 2. DeviceEventClassID = 4624

Селектор 2:

Condition 1. DeviceEventClassID = 4624

Condition 2.  DeviceProduct = Microsoft Windows

The order of conditions in Selector 2 is preferable because it causes less load on the system.

Actions tab

A rule of the simple kind can have only one trigger: On every event. It is activated every time the selector triggers.

Available parameters of the trigger:

• Output—if this check box is selected, the correlation event will be sent for post-processing: for enrichment, for a response, and to destinations.
• Loop—if this check box is selected, the correlation event will be processed by the current correlation rule. This allows hierarchical correlation.

  If both check boxes are selected, the correlation rule will be sent for post-processing first and then to the current correlation rule selectors.

• Do not create alert—if this check box is selected, an alert will not be created when this correlation rule is triggered.
• Active lists update settings group—used to assign the trigger for one or more operations with active lists. You can use the Add active list action and Delete active list action buttons to add or delete operations with active lists, respectively.

  Available settings:

  • Name (required)—this drop-down list is used to select the active list.
  • Operation (required)—this drop-down list is used to select the operation that must be performed:
    • Get—get the Active list entry and write the values of the selected fields into the correlation event.
    • Set—write the values of the selected fields of the correlation event into the Active list by creating a new or updating an existing Active list entry. When the Active list entry is updated, the data is merged and only the specified fields are overwritten.
    • Delete—delete the Active list entry.
  • Key fields (required)—this is the list of event fields used to create the Active list entry. It is also used as the Active list entry key.

    The active list entry key depends on the available fields and does not depend on the order in which they are displayed in the KUMA web interface.

  • Mapping (required for Get and Set operations)—used to map Active list fields with events fields. More than one mapping rule can be set.
    • The left field is used to specify the Active list field.

      The field must not contain special characters or numbers only.

    • The middle drop-down list is used to select event fields.
    • The right field can be used to assign a constant to the Active list field is the Set operation was selected.
• Enrichment settings group—you can modify the fields of correlation events by using enrichment rules. These enrichment rules are stored in the correlation rule where they were created. You can create multiple enrichment rules. Enrichment rules can be added or deleted by using the Add enrichment or Remove enrichment buttons, respectively.
  • Source kind—you can select the type of enrichment in this drop-down list. Depending on the selected type, you may see advanced settings that will also need to be completed.

    Available types of enrichment:

    • constant

      This type of enrichment is used when a constant needs to be added to an event field. Settings of this type of enrichment:

      • In the Constant field, specify the value that should be added to the event field. The value may not be longer than 255 Unicode characters. If you leave this field blank, the existing event field value will be cleared.
      • In the Target field drop-down list, select the KUMA event field to which you want to write the data.

    • dictionary

      This type of enrichment is used if you need to add a value from the dictionary of the Dictionary type.

      When this type is selected in the Dictionary name drop-down list, you must select the dictionary that will provide the values. In the Key fields settings block, you must use the Add field button to select the event fields whose values will be used for dictionary entry selection.

    • table

      This type of enrichment is used if you need to add a value from the dictionary of the Table type.

      When this enrichment type is selected in the Dictionary name drop-down list, select the dictionary for providing the values. In the Key fields group of settings, use the Add field button to select the event fields whose values are used for dictionary entry selection.

      In the Mapping table, configure the dictionary fields to provide data and the event fields to receive data:

      • In the Dictionary field column, select the dictionary field. The available fields depend on the selected dictionary resource.
      • In the KUMA field column, select the event field to which the value is written. For some of the selected fields (*custom* and *flex*), in the Label column, you can specify a name for the data written to them.

      New table rows can be added by using the Add new element button. Columns can be deleted using the button.

    • event

      This type of enrichment is used when you need to write a value from another event field to the current event field. Settings of this type of enrichment:

      • In the Target field drop-down list, select the KUMA event field to which you want to write the data.
      • In the Source field drop-down list, select the event field whose value will be written to the target field.
      • Clicking the button opens the Conversion window in which you can, using the Add conversion button, create rules for modifying the original data before writing them to the KUMA event fields.

        Available conversions

        Conversions are changes that can be applied to a value before it gets written to the event field. The conversion type is selected from a drop-down list.

        Available conversions:

        • lower—is used to make all characters of the value lowercase
        • upper—is used to make all characters of the value uppercase
        • regexp – used to convert a value using the regular expression RE2. When this conversion type is selected, the field appears where regular expression should be added.
        • substring—is used to extract characters in the position range specified in the Start and End fields. These fields appear when this conversion type is selected.
        • replace—is used to replace specified character sequence with the other character sequence. When this type of conversion is selected, new fields appear:
          • Replace chars—in this field you can specify the character sequence that should be replaced.
          • With chars—in this field you can specify the characters sequence should be used instead of replaced characters.
        • trim—used to simultaneously remove the characters specified in the Chars field from the leading and end positions of the value. The field appears when this type of conversion is selected. For example, a trim conversion with the Micromon value applied to Microsoft-Windows-Sysmon results in soft-Windows-Sys.
        • append is used to add the characters specified in the Constant field to the end of the event field value. The field appears when this type of conversion is selected.
        • prepend—used to prepend the characters specified in the Constant field to the start of the event field value. The field appears when this type of conversion is selected.
        • replace with regexp—is used to replace RE2 regular expression results with the character sequence.
          • Expression—in this field you can specify the regular expression which results that should be replaced.
          • With chars—in this field you can specify the characters sequence should be used instead of replaced characters.
        • Converting encoded strings to text:
          • decodeHexString—used to convert a HEX string to text.
          • decodeBase64String—used to convert a Base64 string to text.
          • decodeBase64URLString—used to convert a Base64url string to text.

          When converting a corrupted string or if conversion error occur, corrupted data may be written to the event field.

          During event enrichment, if the length of the encoded string exceeds the size of the field of the normalized event, the string is truncated and is not decoded.

          If the length of the decoded string exceeds the size of the event field into which the decoded value is to be written, such a string is truncated to fit the size of the event field.

    • template

      This type of enrichment is used when you need to write a value obtained by processing Go templates into the event field. Settings of this type of enrichment:

      • Put the Go template into the Template field.

        Event field names are passed in the {{.EventField}} format, where EventField is the name of the event field from which the value must be passed to the script.

        Example: Attack on {{.DestinationAddress}} from {{.SourceAddress}}.

      • In the Target field drop-down list, select the KUMA event field to which you want to write the data.
  • Debug—you can use this drop-down list to enable logging of service operations.
  • Description—the description of a resource. Up to 4,000 Unicode characters.
  • Filter settings block—lets you select which events will be forwarded for enrichment. Configuration is performed as described above.
• Categorization settings group—used to change the categories of assets indicated in events. There can be several categorization rules. You can add or delete them by using the Add categorization or Remove categorization buttons. Only reactive categories can be added to assets or removed from assets.
  • Operation—this drop-down list is used to select the operation to perform on the category:
    • Add—assign the category to the asset.
    • Delete—unbind the asset from the category.
  • Event field—event field that indicates the asset requiring the operation.
  • Category ID—you can click the button to select the category requiring the operation. Clicking this button opens the Select categories window showing the category tree.