sigmahighHunting

Suspicious Child Process of AspNetCompiler

Detects potentially suspicious child processes of "aspnet_compiler.exe".

MITRE ATT&CK

defense-evasion

Detection Query

selection_parent:
  ParentImage|endswith: \aspnet_compiler.exe
selection_child:
  - Image|endswith:
      - \calc.exe
      - \notepad.exe
  - Image|contains:
      - \Users\Public\
      - \AppData\Local\Temp\
      - \AppData\Local\Roaming\
      - :\Temp\
      - :\Windows\Temp\
      - :\Windows\System32\Tasks\
      - :\Windows\Tasks\
condition: all of 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: Suspicious Child Process of AspNetCompiler
id: 9ccba514-7cb6-4c5c-b377-700758f2f120 # SuspChild
related:
    - id: 4c7f49ee-2638-43bb-b85b-ce676c30b260 # TMP File
      type: similar
    - id: 9f50fe98-fe5c-4a2d-86c7-fad7f63ed622 # Susp Paths
      type: similar
    - id: a01b8329-5953-4f73-ae2d-aa01e1f35f00 # Exec
      type: similar
status: test
description: Detects potentially suspicious child processes of "aspnet_compiler.exe".
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
tags:
    - attack.defense-evasion
    - attack.t1127
logsource:
    category: process_creation
    product: windows
detection:
    selection_parent:
        ParentImage|endswith: '\aspnet_compiler.exe'
    selection_child:
        # Note: add other potential suspicious child processes and paths
        - Image|endswith:
              - '\calc.exe'
              - '\notepad.exe'
        - Image|contains:
              - '\Users\Public\'
              - '\AppData\Local\Temp\'
              - '\AppData\Local\Roaming\'
              - ':\Temp\'
              - ':\Windows\Temp\'
              - ':\Windows\System32\Tasks\'
              - ':\Windows\Tasks\'
    condition: all of selection_*
falsepositives:
    - Unknown
level: high