Response rules for Kaspersky Endpoint Detection and Response

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Response rules

Response rules for Kaspersky Endpoint Detection and Response

April 8, 2024

ID 237454

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You can configure response rules to automatically trigger response actions on Kaspersky Endpoint Detection and Response assets. For example, you can configure automatic asset network isolation.

When creating and editing response rules for Kaspersky Endpoint Detection and Response, you need to define values for the following settings.

Response rule settings

Setting	Description
Event field	Required setting. Specifies the event field for the asset for which response actions must be performed. Possible values: SourceAssetID DestinationAssetID DeviceAssetID
Task type	Response action to be performed when data is received that matches the filter. The following types of response actions are available: Enable network isolation. When selecting this type of response, you need to define values for the following setting: Isolation timeout—the number of hours during which the network isolation of an asset will be active. You can indicate from 1 to 9,999 hours. If necessary, you can add an exclusion for network isolation. To add an exclusion for network isolation: Click the Add exclusion button. Select the direction of network traffic that must not be blocked: Inbound. Outbound. Inbound/Outbound. In the Asset IP field, enter the IP address of the asset whose network traffic must not be blocked. If you selected Inbound or Outbound, specify the connection ports in the Remote ports and Local ports fields. If you want to add more than one exclusion, click Add exclusion and repeat the steps to fill in the Traffic direction, Asset IP, Remote ports and Local ports fields. If you want to delete an exclusion, click the Delete button under the relevant exclusion. When adding exclusions to a network isolation rule, Kaspersky Endpoint Detection and Response may incorrectly display the port values in the rule details. This does not affect application performance. For more details on viewing a network isolation rule, please refer to the Kaspersky Anti Targeted Attack Platform Help Guide. Disable network isolation. Add prevention rule. When selecting this type of response, you need to define values for the following settings: Event fields to extract hash from—event fields from which KUMA extracts SHA256 or MD5 hashes of files that must be prevented from running. The selected event fields, as well as the values selected in Event field, must be added to the propagated fields of the correlation rule. File hash #1—SHA256 or MD5 hash of the file to be blocked. At least one of the above fields must be completed. Delete prevention rule. Run program. When selecting this type of response, you need to define values for the following settings: File path—path to the file of the process that you want to start. Command line parameters—parameters with which you want to start the file. Working directory—directory in which the file is located at the time of startup. When a response rule is triggered for users with the General Administrator role, the Run program task will be displayed in the Task manager section of the program web interface. Scheduled task is displayed for this task in the Created column of the task table. You can view task completion results. All of the listed operations can be performed on assets that have Kaspersky Endpoint Agent for Windows. On assets that have Kaspersky Endpoint Agent for Linux, the program can only be started. At the software level, the capability to create prevention rules and network isolation rules for assets with Kaspersky Endpoint Agent for Linux is unlimited. KUMA and Kaspersky Endpoint Detection and Response do not provide any notifications about unsuccessful application of these rules.
Handlers	The number of handlers that the service can run simultaneously to process response rules in parallel. By default, the number of handlers is the same as the number of virtual processors on the server where the service is installed.
Description	Description of the response rule. You can add up to 4,000 Unicode characters.
Filter	Used to define the conditions for the events to be processed using the response rule. You can select an existing filter from the drop-down list or create a new filter. Creating a filter in resources In the Filter drop-down list, select Create new. 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. 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. In the Conditions settings block, specify the conditions that the events must meet: Click the Add condition button. 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. 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. 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. 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. 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. If you have added multiple conditions or groups of conditions, choose a search condition (and, or, not) by clicking the AND button. 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.

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