Add exetool for modifying PE/COFF image subsystem

scripts/exetool

@@ -0,0 +1,79 @@
+#!/usr/bin/env python3
+
+import sys
+import struct
+
+if len(sys.argv) < 3:
+    print("XTChain ExeTool for modifying PE/COFF image subsystem\nNot sufficient parametrs. '[PE/COFF Image File]' '[SubSystem]'")
+    sys.exit(1)
+
+ImageFile = sys.argv[1]
+Subsystem = sys.argv[2].upper()
+
+# Set proper subsystem
+if Subsystem == "UNKNOWN":
+    ImageSubsystem = 0x00
+elif Subsystem == "NT_NATIVE":
+    ImageSubsystem = 0x01
+elif Subsystem == "WINDOWS_GUI":
+    ImageSubsystem = 0x02
+elif Subsystem == "WINDOWS_CLI":
+    ImageSubsystem = 0x03
+elif Subsystem == "WINDOWS_CE_OLD":
+    ImageSubsystem = 0x04
+elif Subsystem == "OS2_CUI":
+    ImageSubsystem = 0x05
+elif Subsystem == "POSIX_CUI":
+    ImageSubsystem = 0x07
+elif Subsystem == "NATIVE_WINDOWS":
+    ImageSubsystem = 0x08
+elif Subsystem == "WINDOWS_CE_GUI":
+    ImageSubsystem = 0x09
+elif Subsystem == "EFI_APPLICATION":
+    ImageSubsystem = 0x0A
+elif Subsystem == "EFI_BOOT_SERVICE_DRIVER":
+    ImageSubsystem = 0x0B
+elif Subsystem == "EFI_RUNTIME_DRIVER":
+    ImageSubsystem = 0x0C
+elif Subsystem == "EFI_ROM":
+    ImageSubsystem = 0x0D
+elif Subsystem == "XBOX":
+    ImageSubsystem = 0x0E
+elif Subsystem == "WINDOWS_BOOT_APPLICATION":
+    ImageSubsystem = 0x10
+elif Subsystem == "XT_NATIVE_KERNEL":
+    ImageSubsystem = 0x14
+elif Subsystem == "XT_NATIVE_APPLICATION":
+    ImageSubsystem = 0x15
+elif Subsystem == "XT_NATIVE_DRIVER":
+    ImageSubsystem = 0x16
+elif Subsystem == "XT_DYNAMIC_LIBRARY":
+    ImageSubsystem = 0x17
+elif Subsystem == "XT_APPLICATION_CLI":
+    ImageSubsystem = 0x18
+elif Subsystem == "XT_APPLICATION_GDI":
+    ImageSubsystem = 0x19
+else:
+    print("Invalid subsystem privided")
+    exit(2)
+
+# Open PE/COFF image file
+PeImage = open(sys.argv[1], "r+b")
+
+# Get PE header
+PeImage.seek(0x3C)
+(PeHeader,)=struct.unpack("H", PeImage.read(2))
+
+# Get PE signature
+PeImage.seek(PeHeader)
+(PeSignature,)=struct.unpack("I", PeImage.read(4))
+if PeSignature != 0x4550:
+    print("Invalid or corrupted PE header")
+
+# Set new image subsystem
+PeImage.seek(PeHeader + 0x5C)
+print("Setting subsystem to " + str(ImageSubsystem))
+PeImage.write(struct.pack("H", ImageSubsystem))
+
+# Close PE/COFF image file
+PeImage.close()