Fixed syntax error

malware/RANSOM_Petya.yar

@@ -31,10 +31,10 @@ rule Petya_Ransomware {
 		uint16(0) == 0x5a4d and filesize < 500KB and $a1 and 3 of ($s*)
 }
 
-rule Ransom.Petya {
+rule Ransom_Petya {
 meta:
     description = "Regla para detectar Ransom.Petya con md5 AF2379CC4D607A45AC44D62135FB7015"
-    author = "CCN-CERT”"
+    author = "CCN-CERT"
     version = "1.0"
 strings:
     $ = { C1 C8 14 2B F0 03 F0 2B F0 03 F0 C1 C0 14 03 C2 }