By pure chance, I verified that my public IP Address was present in "The Spamhaus",
so how I could verify if the router is hacked?
Note that I bought the router a couple of years ago and immediately disabled the web interface, now i log in via ssh.
Here the resource information:
build-time: Nov/14/2018 15:04:25 factory-software: 6.41.3 free-memory: 42.2MiB total-memory: 64.0MiB cpu: MIPS 24Kc V7.4 cpu-count: 1 cpu-frequency: 650MHz cpu-load: 2% free-hdd-space: 4708.0KiB total-hdd-space: 16.0MiB write-sect-since-reboot: 78 write-sect-total: 67742 bad-blocks: 0% architecture-name: mipsbe board-name: RBSXTR platform: MikroTik