... or am i infected from this ledger nano s malwere/Hack that happend in februar ?
But how can i then know if i am sending to the right address, not the hackers address ( the februar hack address thing ) ?
It should be pointed out that there was no ACTUAL malware/hack... What happened was that:
1. Someone pointed out a potential vulnerability with the way the Ledger Chrome App displays addresses in the app... there was no "confirmation" option when displaying receive addresses, so malware COULD potentially alter it to a hackers address and trick people into giving out incorrect addresses. This was ONLY for "receive" addresses... it did not apply to addresses you were sending to, as they were always displayed on the device BEFORE you confirmed a send transaction.
2. There was also the announcement recently about a vulnerability that existed pre-firmware 1.4.1... again, there was NO actual malware/hack known to exist in the wild, simply a proof of concept (not fully disclosed, details due for release Mar 20th)... it was uncovered by a 3rd party, they advised Ledger who patched it in the latest firmware.
As far as I'm aware... there were no known cases of malware exploiting either of these vulnerabilities before they were patched.