<174>Mar 13 2023 18:14:07 10.18.255.1 : %ASA-6-106100: access-list inside denied tcp inside/236.78.82.183(57898) -> outside/120.62.31.17(9997) hit-cnt 1 300-second interval [0xd820e56a, 0x0]

This is a syslog message from a product called ASA Firewall by Cisco. The following fields were extracted from the message:
priority: 174
senderhost: 10.18.255.1
serverport: 9997
severitylabel: informational
tags: ['cisco_asa_deny', 'deny', 'cisco_asa', 'firewall_action']
productids: [17]
severitycode: 6
sourceinfo: unknown
sensitivity: normal
facilitylabel: local5
messagetype: firewall_action
clientport: 57898
vendorcode: ASA-6-106100
action: block
protocol: 6
facilitycode: 21
streamName: cisco_asa
clientIP: 236.78.82.183
serverIP: 120.62.31.17