diff --git a/crawler.go b/crawler.go
index 7d58936..058d7bd 100644
--- a/crawler.go
+++ b/crawler.go
@@ -1,6 +1,122 @@
 package main
 
-func Crawl(month int, year int, outputPath string) []string {
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"strings"
+
+	"github.com/dadosjusbr/coletores/status"
+)
+
+const (
+	viURLType   int = 0
+	remuURLType int = 1
+)
+
+type requestURLs struct {
+	remunerationURL string
+	benefitsURL     string
+}
+
+// Retorna as url para download de cada planilha em questão
+func getRequestURLs(year, month int) (requestURLs, error) {
+	remuIDURL := fmt.Sprint("https://servicos-portal.mpro.mp.br/plcVis/frameset?__report=..%2FROOT%2Frel%2Fcontracheque%2Fmembros%2FremuneracaoMembrosAtivos.rptdesign&anomes=", year, fmt.Sprintf("%02d", month), "&nome=&cargo=&lotacao=")
+	remuSessionID, err := getSessionID(remuIDURL)
+	if err != nil {
+		return requestURLs{}, err
+	}
+	remuDownloadURL := fmt.Sprintf("%s&__sessionId=%s&__format=xls&__asattachment=true&__overwrite=false", remuIDURL, remuSessionID)
+
+	viIDURL := fmt.Sprint("https://servicos-portal.mpro.mp.br/plcVis/frameset?__report=..%2FROOT%2Frel%2Fcontracheque%2Fmembros%2FverbasIndenizatoriasMembrosAtivos.rptdesign&anomes=", year, fmt.Sprintf("%02d", month))
+	benefitsSessionID, err := getSessionID(viIDURL)
+	if err != nil {
+		return requestURLs{}, err
+	}
+	benefitsURL := fmt.Sprintf("%s&__sessionId=%s&__format=xls&__asattachment=true&__overwrite=false", viIDURL, benefitsSessionID)
+
+	return requestURLs{remuDownloadURL, benefitsURL}, nil
+}
+
+// Inicializa o id de sessão para uma dada url
+func getSessionID(url string) (string, error) {
+	resp, err := http.Get(url)
+	if err != nil {
+		return "", status.NewError(status.ConnectionError, fmt.Errorf("Was not possible to get a season id to the url: %s. %q", url, err))
+	}
+	defer resp.Body.Close()
+
+	page, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return "", status.NewError(status.ConnectionError, fmt.Errorf("Was not possible to get a season id to the url: %s. %q", url, err))
+	}
+
+	id := strings.Split(string(page), "Constants.viewingSessionId = \"")
+
+	return id[1][0:19], err
+}
+
+func download(url string, filePath string, outputPath string) error {
+	resp, err := http.Get(url)
+	if err != nil {
+		return status.NewError(status.ConnectionError, fmt.Errorf("Problem doing GET on the URL(%s) to download the file(%s). Error: %q", url, filePath, err))
+	}
+	defer resp.Body.Close()
+
+	_, err = os.Stat(outputPath)
+	if os.IsNotExist(err) {
+		err = os.Mkdir(outputPath, 0755)
+		if err != nil {
+			return status.NewError(status.SystemError, fmt.Errorf("Error creating outputfolder (%s). Error: %q", outputPath, err))
+		}
+	}
+
+	file, err := os.Create(filePath)
+	if err != nil {
+		return status.NewError(status.DataUnavailable, fmt.Errorf("Error creating downloaded (%s) file(%s). Error: %q", url, filePath, err))
+	}
+	defer file.Close()
+
+	if _, err := io.Copy(file, resp.Body); err != nil {
+		return status.NewError(status.SystemError, fmt.Errorf("Was not possible to save the downloaded file: %s. The following mistake was teken: %q", filePath, err))
+	}
+
+	return nil
+}
+
+func Crawl(month int, year int, outputPath string) ([]string, error) {
 	var paths []string
-	return paths
+
+	request, err := getRequestURLs(year, month)
+	if err != nil {
+		return paths, err
+	}
+
+	for typ := 0; typ < 2; typ++ {
+		switch typ {
+		case remuURLType:
+			var fileName = fmt.Sprintf("%d_%02d_remu.xls", year, month)
+			var filePath = fmt.Sprint(outputPath, "/", fileName)
+
+			err = download(request.remunerationURL, filePath, outputPath)
+			if err != nil {
+				return paths, err
+			}
+
+			paths = append(paths, filePath)
+		case viURLType:
+			var fileName = fmt.Sprintf("%d_%02d_vi.xls", year, month)
+			var filePath = fmt.Sprint(outputPath, "/", fileName)
+
+			err = download(request.benefitsURL, filePath, outputPath)
+			if err != nil {
+				return paths, err
+			}
+
+			paths = append(paths, filePath)
+		}
+	}
+	return paths, nil
 }
diff --git a/main.go b/main.go
index d5e8087..5c4f70a 100644
--- a/main.go
+++ b/main.go
@@ -14,7 +14,7 @@ import (
 type Environment struct {
 	Month        int    `envconfig:"MONTH" required:"true"`
 	Year         int    `envconfig:"YEAR" required:"true"`
-	OutputFolder string `envconfig:"OUTPUT_FOLDER" default:"/output"`
+	OutputFolder string `envconfig:"OUTPUT_FOLDER" default:"./output"`
 	GitCommit    string `envconfig:"GIT_COMMIT" required:"true"`
 }
 
@@ -46,7 +46,10 @@ func main() {
 	}
 
 	// Main execution
-	fileNames := Crawl(month, year, outputPath)
+	fileNames, err := Crawl(month, year, outputPath)
+	if err != nil {
+		os.Exit(1)
+	}
 	employees := Parse(month, year, fileNames)
 
 	cr := coletores.ExecutionResult{
@@ -67,7 +70,6 @@ func main() {
 	result, err := json.MarshalIndent(cr, "", "  ")
 	if err != nil {
 		status.ExitFromError(status.NewError(status.SystemError, fmt.Errorf("JSON marshiling error: %q", err)))
-		os.Exit(1)
 	}
 	fmt.Println(string(result))
 }