<4>Jun 18 20:26:57 hq-ie001 kernel: [173094.156745] [UFW BLOCK] IN=ens5 OUT= MAC=02:89:99:e9:b6:8c:02:63:2d:7a:e2:2d:08:00 SRC=152.97.66.245 DST=185.123.135.191 LEN=9001 TOS=0x00 PREC=0x00 TTL=64 ID=51521 DF PROTO=TCP SPT=9042 DPT=53954 WINDOW=434 RES=0x00 ACK URGP=0 
This is a syslog message from a product called Uncomplicated Firewall (UFW) by linux. The following fields were extracted from the message:
action: block
clientbytes: 9001
clientport: 53954
facilitylabel: kernel
localhostname: hq-ie001
localstarttime: Jun 18 20:26:57
messagetype: firewall_action
priority: 4
program: kernel
protocol: 6
senderhost: 10.1.100.159
sensitivity: normal
serverport: 9042
severitycode: 4
severitylabel: warning
sourceinfo: unknown
tags: ['rfc3164', 'ufw', 'firewall_action']
streamName: ufw
clientIP: 185.123.135.191
serverIP: 152.97.66.245