Azure Full Network Packet Capture Detected

Elastic Stack Serverless Security

Identifies potential full network packet capture in Azure. Packet Capture is an Azure Network Watcher feature that can be used to inspect network traffic. This feature can potentially be abused to read sensitive data from unencrypted internal traffic.

Rule type: query

Rule indices:

filebeat-*
logs-azure*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-25m (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[Date Math format], see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://docs.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations

Tags:

Elastic
Cloud
Azure
Continuous Monitoring
SecOps
Monitoring

Version: 3

Rule authors:

Austin Songer

Rule license: Elastic License v2

Investigation guide

Rule query

		event.dataset:azure.activitylogs and azure.activitylogs.operation_name:
    (
        "MICROSOFT.NETWORK/*/STARTPACKETCAPTURE/ACTION" or
        "MICROSOFT.NETWORK/*/VPNCONNECTIONS/STARTPACKETCAPTURE/ACTION" or
        "MICROSOFT.NETWORK/*/PACKETCAPTURES/WRITE"
    ) and
event.outcome:(Success or success)

	

Framework: MITRE ATT&CKTM

Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
Technique:
- Name: Network Sniffing
- ID: T1040
- Reference URL: https://attack.mitre.org/techniques/T1040/