Add Turla neuron2 from NCSC report

malware/APT_Turla_Neuron.yar

+rule MW_neuron2_loader_strings : Turla APT loader
+{
+    meta:
+        description = "Rule for detection of Neuron2 based on strings within the loader"
+        author = "NCSC"
+        family = "Turla"
+        reference = "https://www.ncsc.gov.uk/alerts/turla-group-malware"
+        date = "2018-01-18"
+        hash1 = "51616b207fde2ff1360a1364ff58270e0d46cf87a4c0c21b374a834dd9676927"
+    strings:
+        $ = "dcom_api" ascii
+        $ = "http://*:80/OWA/OAB/" ascii
+        $ = "https://*:443/OWA/OAB/" ascii
+        $ = "dcomnetsrv.cpp" wide
+        $ = "dcomnet.dll" ascii
+        $ = "D:\\Develop\\sps\\neuron2\\x64\\Release\\dcomnet.pdb" ascii
+    condition:
+        (uint16(0) == 0x5A4D and uint16(uint32(0x3c)) == 0x4550) and 2 of them
+}
+
+
+rule MW_neuron2_decryption_routine : Turla APT
+{
+    meta:
+        description = "Rule for detection of Neuron2 based on the routine used to decrypt the payload"
+        author = "NCSC"
+        family = "Turla"
+        reference = "https://www.ncsc.gov.uk/alerts/turla-group-malware"
+        date = "2018-01-18"
+        hash1 = "51616b207fde2ff1360a1364ff58270e0d46cf87a4c0c21b374a834dd9676927"
+    strings:
+        $ = {81 FA FF 00 00 00 0F B6 C2 0F 46 C2 0F B6 0C 04 48 03 CF 0F B6 D1 8A 0C 14 8D 50 01 43 32 0C 13 41 88 0A 49 FF C2 49 83 E9 01}
+    condition:
+        (uint16(0) == 0x5A4D and uint16(uint32(0x3c)) == 0x4550) and all of them
+}
+
+
+rule MW_neuron2_dotnet_strings : Turla APT
+{
+    meta:
+        description = "Rule for detection of the .NET payload for Neuron2 based on strings used"
+        author = "NCSC"
+        family = "Turla"
+        reference = "https://www.ncsc.gov.uk/alerts/turla-group-malware"
+        date = "2018-01-18"
+        hash1 = "83d8922e7a8212f1a2a9015973e668d7999b90e7000c31f57be83803747df015"
+    strings:
+        $dotnetMagic = "BSJB" ascii
+        $s1 = "http://*:80/W3SVC/" wide
+        $s2 = "https://*:443/W3SVC/" wide
+        $s3 = "neuron2.exe" ascii
+        $s4 = "D:\\Develop\\sps\\neuron2\\neuron2\\obj\\Release\\neuron2.pdb" ascii
+    condition:
+        (uint16(0) == 0x5A4D and uint16(uint32(0x3c)) == 0x4550) and $dotnetMagic and 2 of ($s*)
+}
+