sigmahighHunting

Potentially Suspicious ASP.NET Compilation Via AspNetCompiler

Detects execution of "aspnet_compiler.exe" with potentially suspicious paths for compilation.

MITRE ATT&CK

defense-evasion

Detection Query

selection:
  Image|contains:
    - :\Windows\Microsoft.NET\Framework\
    - :\Windows\Microsoft.NET\Framework64\
    - :\Windows\Microsoft.NET\FrameworkArm\
    - :\Windows\Microsoft.NET\FrameworkArm64\
  Image|endswith: \aspnet_compiler.exe
  CommandLine|contains:
    - \Users\Public\
    - \AppData\Local\Temp\
    - \AppData\Local\Roaming\
    - :\Temp\
    - :\Windows\Temp\
    - :\Windows\System32\Tasks\
    - :\Windows\Tasks\
condition: selection

Author

Nasreddine Bencherchali (Nextron Systems)

Created

2023-08-14

Data Sources

windowsProcess Creation Events

Platforms

windows

References

Tags

attack.defense-evasionattack.t1127

Raw Content

title: Potentially Suspicious ASP.NET Compilation Via AspNetCompiler
id: 9f50fe98-fe5c-4a2d-86c7-fad7f63ed622 # Susp Paths
related:
    - id: 9ccba514-7cb6-4c5c-b377-700758f2f120 # SuspChild
      type: similar
    - id: 4c7f49ee-2638-43bb-b85b-ce676c30b260 # TMP File
      type: similar
    - id: a01b8329-5953-4f73-ae2d-aa01e1f35f00 # Exec
      type: similar
status: test
description: Detects execution of "aspnet_compiler.exe" with potentially suspicious paths for compilation.
references:
    - https://lolbas-project.github.io/lolbas/Binaries/Aspnet_Compiler/
    - https://ijustwannared.team/2020/08/01/the-curious-case-of-aspnet_compiler-exe/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-08-14
modified: 2025-02-24
tags:
    - attack.defense-evasion
    - 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'
        CommandLine|contains:
            # Note: add other potential suspicious paths
            - '\Users\Public\'
            - '\AppData\Local\Temp\'
            - '\AppData\Local\Roaming\'
            - ':\Temp\'
            - ':\Windows\Temp\'
            - ':\Windows\System32\Tasks\'
            - ':\Windows\Tasks\'
    condition: selection
falsepositives:
    - Unknown
level: high