.. / Ilasm.exe
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Compile

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

Usecase: Compile attacker code on system. Bypass defensive counter measures.
Privileges required: User
OS: Windows 7, Windows 10, Windows 11
MITRE ATT&CK®: T1127

Binary file used by .NET to compile C#/intermediate (IL) code to dll

ilasm.exe C:\public\test.txt /dll

Usecase: A description of the usecase
Privileges required: User
OS: Windows 7, Windows 10, Windows 11
MITRE ATT&CK®: T1127

.. / Ilasm.exe Star

Compile

.. / Ilasm.exe
Star