New blog on using CLR customizations to improve the OPSEC of your .NET execution harness. This includes a novel AMSI bypass that identified by author in 2023. By taking control of CLR assembly loads, we can load assemblies from memory with no AMSI scan.
https://securityintelligence.com/x-force/being-a-good-clr-host-modernizing-offensive-net-tradecraft/
Proof-of-concept for the AMSI bypass and an implementation of a CLR memory manager is on GitHub. We can implement custom memory routines and track all allocations made by the CLR.
https://github.com/passthehashbrowns/Being-A-Good-CLR-Host
#redteam #net #clr
