.. /Ilasm.exe
Star

used for compile c# code into dll or exe.

Paths:

C:\Windows\Microsoft.NET\Framework\v4.0.30319\ilasm.exe
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\ilasm.exe

Resources:

https://github.com/LuxNoBulIshit/BeforeCompileBy-ilasm/blob/master/hello_world.txt

Acknowledgements:

Hai Vaknin(Lux) (@VakninHai)
Lior Adar

Detection:

IOC: Ilasm may not be used often in production environments (such as on endpoints)
Sigma: https://github.com/SigmaHQ/sigma/blob/bea6f18d350d9c9fdc067f93dde0e9b11cc22dc2/rules/windows/process_creation/proc_creation_win_lolbin_ilasm.yml

Compile

Binary file used by .NET to compile C#/intermediate (IL) code to .exe
```
ilasm.exe C:\public\test.txt /exe
```
Use case
Compile attacker code on system. Bypass defensive counter measures.

Privileges required
User

Operating systems
Windows 7, Windows 10, Windows 11

ATT&CK® technique
T1127
Binary file used by .NET to compile C#/intermediate (IL) code to dll
```
ilasm.exe C:\public\test.txt /dll
```
Use case
A description of the usecase

Privileges required
User

Operating systems
Windows 7, Windows 10, Windows 11

ATT&CK® technique
T1127