add script to MajorOperatingSystemVersion and MajorSubsystemVersion i…

…n PE header from 6 to 5

suite/patch_major_os_version.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python
+# By Nguyen Anh Quynh
+
+import sys, struct
+
+if len(sys.argv) < 2:
+    print("Usage: %s <pe_file_path>" % sys.argv[0]) 
+    sys.exit(0)
+
+pe_file_path = sys.argv[1]
+
+with open(pe_file_path, "rb") as f:
+    b = f.read()
+
+if not b.startswith("MZ"):
+    print("Not a PE file")
+    sys.exit(0)
+
+e_lfanew = struct.unpack_from("<I", b, 0x3C)[0]
+vb = struct.pack("<HHHHH", 5, 0, 0, 0, 5) # encode versions
+# patches MajorOperatingSystemVersion and MajorSubsystemVersion
+b = b[0:e_lfanew + 0x40] + vb + b[e_lfanew + 0x4A:]
+# write back to file
+with open(pe_file_path, "wb") as f:
+    f.write(b)