32/64-bit FSharp (F#) Interpreter included with Visual Studio. Located at: c:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\Common7\IDE\CommonExtensions\Microsoft\FSharp\fsianycpu.exe.
fsianycpufsianycpuSandbox: execFile · Timeout: 30s
security.defense-evasion.bypass Outputs
process.output Command execution output
process_spawn Produces
process.output| Resource | Value |
|---|---|
| CPU | low |
| Memory | 16 MB |
| Network | low |
| Disk I/O | low |
Execute F# code via script file (Execute payload with Microsoft signed binary to bypass WDAC policies)
fsianycpu.exe {PATH:.fsscript}Execute F# code via interactive command line (Execute payload with Microsoft signed binary to bypass WDAC policies)
fsianycpu.exe| Type | Rule / Indicator |
|---|---|
| blockrule | https://docs.microsoft.com/en-us/windows/security/threat-protection/windows-defender-application-control/microsoft-recommended-block-rules |
| ioc | FsiAnyCpu.exe execution may be suspicious on non-developer machines |
| sigma | https://github.com/SigmaHQ/sigma/blob/6b34764215b0e97e32cbc4c6325fc933d2695c3a/rules/windows/process_creation/proc_creation_win_lolbin_fsharp_interpreters.yml |
fsianycpu is a Windows LOLBin. 32/64-bit FSharp (F#) Interpreter included with Visual Studio. Located at: c:\Program Files (x86)\Microsoft Visual Studio\2019\Professional\Common7\IDE\CommonExtensions\Microsoft\FSharp\fsianycpu.exe.