Symantec DCS & SCSP IPS policy will help to block DLL injection. refer the blog
https://www.symantec.com/connect/blogs/symantec-critical-system-protection-delivers-memory-control-stop-targeted-attacks
The prevention policy guide have more details
https://symwisedownload.symantec.com/resources/sites/SYMWISE/content/live/DOCUMENTATION/5000/DOC5947/en_US/SCSP_Prevention_Policy_Reference_Guide.pdf?__gda__=1489543891_092503e03aef57222e469d6e7ffc018e