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Adversaries may leverage traffic mirroring in order to automate data exfiltration over compromised network infrastructure. Traffic mirroring is a native feature for some network devices and used for network analysis and may be configured to duplicate traffic and forward to one or more destinations for analysis by a network analyzer or other monitoring device.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel:
  • Last Updated: 2020-10-28
  • Author: Mikael Bjerkeland, Splunk
  • ID: 42b3b753-5925-49c5-9742-36fa40a73990


ID Technique Tactic
T1200 Hardware Additions Initial Access
T1020 Automated Exfiltration Exfiltration
T1498 Network Denial of Service Impact
T1020.001 Traffic Duplication Exfiltration
`cisco_networks` (facility="MIRROR" mnemonic="ETH_SPAN_SESSION_UP") OR (facility="SPAN" mnemonic="SESSION_UP") OR (facility="SPAN" mnemonic="PKTCAP_START") OR (mnemonic="CFGLOG_LOGGEDCMD" command="monitor session*") 
| stats min(_time) AS firstTime max(_time) AS lastTime count BY host facility mnemonic 
| `security_content_ctime(firstTime)`
| `detect_traffic_mirroring_filter`

Associated Analytic Story

How To Implement

This search uses a standard SPL query on logs from Cisco Network devices. The network devices must log with a severity level of minimum "5 - notification". The search also requires that the Cisco Networks Add-on for Splunk (https://splunkbase.splunk.com/app/1467) is used to parse the logs from the Cisco network devices and that the devices have been configured according to the documentation of the Cisco Networks Add-on. Also note that an attacker may disable logging from the device prior to enabling traffic mirroring.

Required field

  • _time
  • facility
  • mnemonic
  • host

Kill Chain Phase

  • Delivery
  • Actions on Objectives

Known False Positives

This search will return false positives for any legitimate traffic captures by network administrators.


Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

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