sdb-explorer is a tool that provides the ability to read and write Microsoft Fix-It In-memory patches, also known as SDB files.
Note the version of apphelp.dll in Windows 10 does not include the function SeiApplyPatch. This was the function responsible for patching and flushing the instruction cache. It appears that Microsoft has removed support for this undocumented feature.
For more information see:
https://www.blackhat.com/asia-14/archives.html#Erickson
http://www.youtube.com/watch?v=Gx6OgCxPBIQ
Please see my slides from Codeblue 2014: http://sdb.io/erickson-codeblue.pdf
https://www.fireeye.com/blog/threat-research/2017/05/fin7-shim-databases-persistence.html