Merge pull request #378 from Nishan8583/master

Snake Ransomware yara rule

malware/RANSOM_Snake.yar

+rule SnakeRansomware
+{
+    meta:
+        Author = "Nishan Maharjan"
+        Description = "A yara rule to catch snake ransomware"
+        Reference = "https://medium.com/@nishanmaharjan17/malware-analysis-snake-ransomware-a0e66f487017"
+        Data = "15th May 2020"
+    strings:
+        $go_build_id = "Go build ID: \"X6lNEpDhc_qgQl56x4du/fgVJOqLlPCCIekQhFnHL/rkxe6tXCg56Ez88otHrz/Y-lXW-OhiIbzg3-ioGRz\""
+        $math_rand_seed_calling = { 89 C8 BB 00 CA 9A 3B 89 D1 F7 E3 81 E1 FF FF FF 3F 89 C3 01 C8 89 C6 05 00 00 1A 3D 89 04 24 69 ED 00 CA 9A 3B 01 EA 89 CD C1 F9 1F 01 EB 11 CA 81 C6 00 00 1A 3D 81 D2 EB 03 B2 A1 89 54 24 04 E8 10 62 F6 FF }
+        $encryption_function = {64 8B 0D 14 00 00 00 8B 89 00 00 00 00 3B 61 08 0F 86 38 01 00 00 83 EC 3C E8 32 1A F3 FF 8D 7C 24 28 89 E6 E8 25 EA F0 FF 8B 44 24 2C 8B 4C 24 28 89 C2 C1 E8 1F C1 E0 1F 85 C0 0F 84 FC 00 00 00 D1 E2 89 CB C1 E9 1F 09 D1 89 DA D1 E3 C1 EB 1F 89 CD D1 E1 09 D9 89 CB 81 C1 80 7F B1 D7 C1 ED 1F 81 C3 80 7F B1 D7 83 D5 0D 89 C8 BB 00 CA 9A 3B 89 D1 F7 E3 81 E1 FF FF FF 3F 89 C3 01 C8 89 C6 05 00 00 1A 3D 89 04 24 69 ED 00 CA 9A 3B 01 EA 89 CD C1 F9 1F 01 EB 11 CA 81 C6 00 00 1A 3D 81 D2 EB 03 B2 A1 89 54 24 04 E8 10 62 F6 FF 31 C0 EB 79 89 44 24 20 8B 4C 24 40 8D 14 C1 8B 1A 89 5C 24 24 8B 52 04 89 54 24 1C C7 04 24 05 00 00 00 E8 48 FE FF FF 8B 44 24 08 8B 4C 24 04 C7 04 24 00 00 00 00 8B 54 24 24 89 54 24 04 8B 5C 24 1C 89 5C 24 08 89 4C 24 0C 89 44 24 10 E8 EC DD EF FF 8B 44 24 18 8B 4C 24 14 89 4C 24 08 89 44 24 0C 8B 44 24 24 89 04 24 8B 44 24 1C 89 44 24 04 E8 68 BB F3 FF 8B 44 24 20 40}
+    condition:
+        all of them     
+}
+
+