How analyze router syslog

Router has https, VPN, PostgreSql and VNC ports open. I want to know user names and passwords used in attacks by countries and ip addresses. Currently free kiwi syslog server from solarwinds.com in Windows is used to collect Asus RT-AC87U router syslog. AsusWrt-Merlin firmware is running in router, can changed to DD-WRT or other if this helps. Kiwi shows syslog entries as plain text, not formatted to columns: Enties cannot filtered or sorted by ip address, id addresses are not resolved to countries, no port scanning, tried user names and passwords are available. Where to find free tool to anal

Question by Andrus on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.