title: Antivirus Web Shell Detection
id: fdf135a2-9241-4f96-a114-bb404948f736
description: Detects a highly relevant Antivirus alert that reports a web shell
date: 2018/09/09
modified: 2019/10/04
author: Florian Roth
references:
    - https://www.nextron-systems.com/2018/09/08/antivirus-event-analysis-cheat-sheet-v1-4/
tags:
    - attack.persistence
    - attack.t1100
logsource:
    product: antivirus
detection:
    selection:
        Signature: 
            - "PHP/Backdoor*"
            - "JSP/Backdoor*"
            - "ASP/Backdoor*"
            - "Backdoor.PHP*"
            - "Backdoor.JSP*"
            - "Backdoor.ASP*"
            - "*Webshell*"
    condition: selection
fields:
    - FileName
    - User
falsepositives:
    - Unlikely
level: critical