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Add DPI-based network rule for responder footprints detection #5751

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Add DPI-based network rule for responder footprints detection #5751

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24 changes: 24 additions & 0 deletions rules/network/dpi/dpi_responder_footprints_ntlm_credential_theft.yml
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title: Responder Tool Footprints for NTLM Credential Theft
id: 8f3a2c4e-7b9d-4d1a-9c3e-2a26128b9d2f
status: experimental
description: Detects NTLM traffic patterns indicative of Responder credential harvesting.
author: Yael Ben Yair
date: 2025/11/11
logsource:
category: network
service: ntlm
detection:
domain_pattern:
netbios_domain_name|re: '^[A-Z0-9]{4}$'
computer_pattern:
netbios_computer_name|re: '^WIN-[A-Z0-9]{11}$'
dns_swap_1:
dns_computer_name|fieldref: netbios_domain_name
dns_swap_2:
dns_domain_name|fieldref: netbios_computer_name
condition: (domain_pattern or computer_pattern) or (dns_swap_1 or dns_swap_2)
level: medium
tags:
- attack.credential-access
- attack.collection
- attack.t1557
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