https://www.cso.com.au/article/626753/wikileaks-vault-7-cia-stealthy-angelfire-windows-malware/
The Keystone component launches other Angelfire applications and is designed to leave minimal forensic evidence since Keystone implant code are loaded directly into memory and never touch the file system. The intent here was to ensure that processes created by Angelfire applications don’t look out of the ordinary.