m365_defender: fix message ID handling - #12546
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Pinging @elastic/security-service-integrations (Team:Security-Service Integrations) |
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Package m365_defender - 2.21.1 containing this change is available at https://epr.elastic.co/package/m365_defender/2.21.1/ |
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The current data flow for the fields changed here is NetworkMessageId[1] → m365_defender.event.network.message_id → email.message_id and InternetMessageId[1] → m365_defender.event.internet_message_id → email.local_id, but the definition of email.message_id is that it represents the RFC5322 Message-ID[2], corresponding to the Defender InternetMessageId value, and email.local_id[3] is the non-persistent identifier, reasonably corresponding to the Defender NetworkMessageId value. Also add m365_defender.event.internet_message_id to final remove processor. [1]https://learn.microsoft.com/en-us/defender-xdr/advanced-hunting-emailevents-table#:~:text=NetworkMessageId,sending%20email%20system [2]https://www.elastic.co/guide/en/ecs/current/ecs-email.html#field-email-message-id [3]https://www.elastic.co/guide/en/ecs/current/ecs-email.html#field-email-local-id
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The current data flow for the fields changed here is NetworkMessageId[1] → m365_defender.event.network.message_id → email.message_id and InternetMessageId[1] → m365_defender.event.internet_message_id → email.local_id, but the definition of email.message_id is that it represents the RFC5322 Message-ID[2], corresponding to the Defender InternetMessageId value, and email.local_id[3] is the non-persistent identifier, reasonably corresponding to the Defender NetworkMessageId value. Also add m365_defender.event.internet_message_id to final remove processor. [1]https://learn.microsoft.com/en-us/defender-xdr/advanced-hunting-emailevents-table#:~:text=NetworkMessageId,sending%20email%20system [2]https://www.elastic.co/guide/en/ecs/current/ecs-email.html#field-email-message-id [3]https://www.elastic.co/guide/en/ecs/current/ecs-email.html#field-email-local-id
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