Florian Roth
87 lines
3.2 KiB
YAML
87 lines
3.2 KiB
YAML
title: Antivirus Web Shell Detection
|
|
id: fdf135a2-9241-4f96-a114-bb404948f736
|
|
status: test
|
|
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.
|
|
references:
|
|
- https://www.nextron-systems.com/?s=antivirus
|
|
- 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
|
|
- https://www.virustotal.com/gui/file/13ae8bfbc02254b389ab052aba5e1ba169b16a399d9bc4cb7414c4a73cd7dc78/detection
|
|
author: Florian Roth (Nextron Systems), Arnim Rupp
|
|
date: 2018/09/09
|
|
modified: 2023/02/03
|
|
tags:
|
|
- attack.persistence
|
|
- attack.t1505.003
|
|
logsource:
|
|
category: antivirus
|
|
detection:
|
|
selection:
|
|
- Signature|startswith:
|
|
- 'PHP.'
|
|
- 'JSP.'
|
|
- 'ASP.'
|
|
- 'Perl.'
|
|
- 'VBS/Uxor' # looking for 'VBS/' would also find downloaders and droppers meant for desktops
|
|
- 'IIS/BackDoor'
|
|
- 'JAVA/Backdoor'
|
|
- 'Troj/ASP'
|
|
- 'Troj/PHP'
|
|
- 'Troj/JSP'
|
|
- Signature|contains:
|
|
- 'Webshell'
|
|
- 'Chopper'
|
|
- 'SinoChoper'
|
|
- 'ASPXSpy'
|
|
- 'Aspdoor'
|
|
- 'filebrowser'
|
|
- 'PHP_'
|
|
- 'JSP_'
|
|
- 'ASP_' # looking for 'VBS_' would also find downloaders and droppers meant for desktops
|
|
- 'PHP:'
|
|
- 'JSP:'
|
|
- 'ASP:'
|
|
- 'Perl:'
|
|
- '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'
|
|
- 'PHP.Agent'
|
|
- 'ASP.Agent'
|
|
- 'JSP.Agent'
|
|
- 'VBS.Agent'
|
|
- 'Backdoor.PHP'
|
|
- 'Backdoor.JSP'
|
|
- 'Backdoor.ASP'
|
|
- 'Backdoor.VBS'
|
|
- 'Backdoor.Java'
|
|
- 'PShlSpy'
|
|
- 'C99shell'
|
|
condition: selection
|
|
fields:
|
|
- FileName
|
|
- User
|
|
falsepositives:
|
|
- Unlikely
|
|
level: high
|