So, I've found answer to this question, connection url for this database would be:
jdbc:jtds:sqlserver://exampleds/exampleic;domain=???
Domain name described somewhere in web.config in C# application, driver for this connection would be
net.sourceforge.jtds.jdbc.Driver
So, DataSource would be...
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="net.sourceforge.jtds.jdbc.Driver"/>
<property name="url" value="jdbc:jtds:sqlserver://exampleds/exampleic;domain=dName"/>
<property name="username" value=""/>
<property name="password" value=""/>
</bean>
Username and password I, personally, have known from administrator.