This documentation contains work-in-progress information for future Elastic Stack and Cloud releases. Use the version selector to view supported release docs. It also contains some Elastic Cloud serverless information. Check out our serverless docs for more details.

« Azure Frontdoor Web Application Firewall (WAF) Policy Deleted Azure Global Administrator Role Addition to PIM User »

› › ›

Azure Full Network Packet Capture Detected

edit

Azure Full Network Packet Capture Detected

edit

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: 5 minutes

Searches indices from: now-25m (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: 101 (version history)

Added (Elastic Stack release): 7.16.0

Last modified (Elastic Stack release): 8.6.0

Rule authors: Austin Songer

Rule license: Elastic License v2

Potential false positives

edit

Full Network Packet Capture may be done by a system or network administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. Full Network Packet Capture from unfamiliar users or hosts should be investigated. If known behavior is causing false positives, it can be exempted from the rule.

Investigation guide

edit

Rule query

edit

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)

Threat mapping

edit

Framework: MITRE ATT&CK^TM

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/

Rule version history

edit

Version 101 (8.6.0 release)

Formatting only

Version 100 (8.5.0 release)

Formatting only

Version 3 (8.4.0 release)

Updated query, changed from:

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)

« Azure Frontdoor Web Application Firewall (WAF) Policy Deleted Azure Global Administrator Role Addition to PIM User »