Possible new DHCP server

Cortex XDR Analytics Alert Reference by Alert name

Product
Cortex XDR
Last date published
2024-06-18
Category
Analytics Alert Reference
Order
Alert name

Synopsis

Activation Period

14 Days

Training Period

30 Days

Test Period

N/A (single event)

Deduplication Period

1 Day

Required Data

  • Requires:
    • XDR Agent

Detection Modules

ATT&CK Tactic

Credential Access (TA0006)

ATT&CK Technique

Adversary-in-the-Middle (T1557)

Severity

Medium

Description

A DHCP response was sent from an unknown DHCP server.
Attackers may send a DHCP response to a host in his LAN to inject a DNS server, route or WPAD server.

Attacker's Goals

The attacker is attempting a man-in-the-middle NTLM relay attack to intercept authentication attempts and move laterally within an environment.

Investigative actions

  • Check if the source agent is a legitimate DHCP server.
  • Check if the attacked host send DNS queries to an unusual IP.
  • Check if the attacked host send WPAD HTTP/S requests to an unusual host.