Add APT_DeputyDog from nyx0 PR

Add APT_DeputyDog
Commit:  b6994ffa563084d121b5d9e718583d9406e51f2c

malware/APT_DeputyDog_Fexel.yar

@@ -18,3 +18,19 @@ strings:
 condition:
 	any of them
 }
+
+rule APT_DeputyDog
+{
+    meta:
+        Author      = "FireEye Labs"
+        Date        = "2013/09/21"
+        Description = "detects string seen in samples used in 2013-3893 0day attacks"
+        Reference   = "https://www.fireeye.com/blog/threat-research/2013/09/operation-deputydog-zero-day-cve-2013-3893-attack-against-japanese-targets.html"
+
+    strings:
+        $mz = {4d 5a}
+        $a = "DGGYDSYRL"
+
+    condition:
+        ($mz at 0) and $a
+}
\ No newline at end of file