Suspicious Execution of AspNetCompiler (via process_creation)

title: Suspicious Execution of AspNetCompiler (via process_creation)
id: 85073367-325a-5abb-8c7b-a29f38f979aa
status: stable
description: This rule detects execution of "aspnet_compiler.exe" that can be misused to compile and execute C# code.
references:
    - https://attack.mitre.org/techniques/T1127/
    - https://lolbas-project.github.io/lolbas/Binaries/Aspnet_Compiler/
    - https://ijustwannared.team/2020/08/01/the-curious-case-of-aspnet_compiler-exe/
author: Huntrule Team
date: 2026-03-13
tags:
    - attack.execution
    - attack.stealth
    - attack.t1127
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|contains:
            - ':\Windows\Microsoft.NET\Framework\'
            - ':\Windows\Microsoft.NET\Framework64\'
            - ':\Windows\Microsoft.NET\FrameworkArm\'
            - ':\Windows\Microsoft.NET\FrameworkArm64\'
        Image|endswith: '\aspnet_compiler.exe'
    condition: selection
falsepositives:
    - Unknown
level: medium