вы можете попробовать это правило
<rule name="query string redirect" stopProcessing="true"><match url="(.*)" />
<conditions>
<add input="{HTTP_HOST}" pattern="www.domain1.com" />
<add input="{HTTPS}" pattern="on" />
<add input="{REQUEST_URI}" pattern="/ABC/DEF" />
<add input="{QUERY_STRING}" pattern="q\=([a-zA-Z0-9]+)\&t=([a-zA-Z0-9]+)" />
</conditions>
<action type="Redirect" url="http://www.domain1.com/DEF/GHI/JKL?q={C:1}&t={C:2}" appendQueryString="false" />
</rule>