So, after some diggin' on Mauser I found out that this connector must be something like this:
FH34SRJ-34S-0.5SH
or this:
AYF533435
or this:
XF2M, XF3M Series
Probably the one from Hirose is the original one. But I can't find it in Poland and buying on Mauser a $3 connector with $30 shipping to Poland is quite an absurd. Maybe it will be on some chineese site