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Detect Rogue DHCP Server

Description

By enabling DHCP Snooping as a Layer 2 Security measure on the organization's network devices, we will be able to detect unauthorized DHCP servers handing out DHCP leases to devices on the network (Man in the Middle attack).

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Use Case

Security Monitoring

Category

Adversary Tactics

Alert Volume

By enabling DHCP Snooping as a Layer 2 Security measure on the organization's network devices, we will be able to detect unauthorized DHCP servers handing out DHCP leases to devices on the network (Man in the Middle attack).

SPL Difficulty

None

Journey

Stage 2

MITRE ATT&CK Tactics

Initial Access
Impact
Credential Access
Collection

MITRE ATT&CK Techniques

Hardware Additions
Network Denial of Service
Man-in-the-Middle

Hardware Additions
Network Denial of Service
Man-in-the-Middle

MITRE Threat Groups

APT28
DarkVishnya

Data Sources

Network Communication

   Help

Detect Rogue DHCP Server Help

This search uses a standard SPL query on logs from Cisco Network devices. The network devices must be configured with DHCP Snooping enabled (see https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960x/software/15-02EX/security/configurationguide/bsec152ex2960-xcg/bsec152ex2960-xcgchapter_01101.html) and 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.

   Search

`cisco_networks` facility="DHCP_SNOOPING" mnemonic="DHCP_SNOOPING_UNTRUSTED_PORT" | stats min(_time) AS firstTime max(_time) AS lastTime count values(message_type) AS message_type values(src_mac) AS src_mac BY host | `security_content_ctime(firstTime)`|`security_content_ctime(lastTime)`| `detect_rogue_dhcp_server_filter`
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