81 lines
2.3 KiB
YAML
81 lines
2.3 KiB
YAML
|
|
title: Antivirus Web Shell Detection
|
|
ruletype: Sigma
|
|
author: Florian Roth, Arnim Rupp
|
|
date: 2018/09/09
|
|
description: Detects a highly relevant Antivirus alert that reports a web shell. It's
|
|
highly recommended to tune this rule to the specific strings used by your anti virus
|
|
solution by downloading a big webshell repo from e.g. github and checking the matches.
|
|
detection:
|
|
SELECTION_1:
|
|
Signature:
|
|
- PHP/*
|
|
- JSP/*
|
|
- ASP/*
|
|
- Perl/*
|
|
- PHP.*
|
|
- JSP.*
|
|
- ASP.*
|
|
- Perl.*
|
|
- VBS/Uxor*
|
|
- IIS/BackDoor*
|
|
- JAVA/Backdoor*
|
|
- Troj/ASP*
|
|
- Troj/PHP*
|
|
- Troj/JSP*
|
|
SELECTION_2:
|
|
Signature:
|
|
- '*Webshell*'
|
|
- '*Chopper*'
|
|
- '*SinoChoper*'
|
|
- '*ASPXSpy*'
|
|
- '*Aspdoor*'
|
|
- '*filebrowser*'
|
|
- '*PHP_*'
|
|
- '*JSP_*'
|
|
- '*ASP_*'
|
|
- '*PHP:*'
|
|
- '*JSP:*'
|
|
- '*ASP:*'
|
|
- '*Perl:*'
|
|
- '*PHPShell*'
|
|
- '*Trojan.PHP*'
|
|
- '*Trojan.ASP*'
|
|
- '*Trojan.JSP*'
|
|
- '*Trojan.VBS*'
|
|
- '*PHP?Agent*'
|
|
- '*ASP?Agent*'
|
|
- '*JSP?Agent*'
|
|
- '*VBS?Agent*'
|
|
- '*Backdoor?PHP*'
|
|
- '*Backdoor?JSP*'
|
|
- '*Backdoor?ASP*'
|
|
- '*Backdoor?VBS*'
|
|
- '*Backdoor?Java*'
|
|
condition: (SELECTION_1 or SELECTION_2)
|
|
falsepositives:
|
|
- Unlikely
|
|
fields:
|
|
- FileName
|
|
- User
|
|
id: fdf135a2-9241-4f96-a114-bb404948f736
|
|
level: critical
|
|
logsource:
|
|
product: antivirus
|
|
modified: 2021/05/08
|
|
references:
|
|
- https://www.nextron-systems.com/2021/03/25/antivirus-event-analysis-cheat-sheet-v1-8/
|
|
- https://github.com/tennc/webshell
|
|
- https://www.virustotal.com/gui/file/bd1d52289203866645e556e2766a21d2275877fbafa056a76fe0cf884b7f8819/detection
|
|
- https://www.virustotal.com/gui/file/308487ed28a3d9abc1fec7ebc812d4b5c07ab025037535421f64c60d3887a3e8/detection
|
|
- https://www.virustotal.com/gui/file/7d3cb8a8ff28f82b07f382789247329ad2d7782a72dde9867941f13266310c80/detection
|
|
- https://www.virustotal.com/gui/file/e841675a4b82250c75273ebf0861245f80c6a1c3d5803c2d995d9d3b18d5c4b5/detection
|
|
- https://www.virustotal.com/gui/file/a80042c61a0372eaa0c2c1e831adf0d13ef09feaf71d1d20b216156269045801/detection
|
|
- https://www.virustotal.com/gui/file/b219f7d3c26f8bad7e175934cd5eda4ddb5e3983503e94ff07d39c0666821b7e/detection
|
|
- https://www.virustotal.com/gui/file/b8702acf32fd651af9f809ed42d15135f842788cd98d81a8e1b154ee2a2b76a2/detection
|
|
status: experimental
|
|
tags:
|
|
- attack.persistence
|
|
- attack.t1100
|
|
- attack.t1505.003
|