127 lines
4.2 KiB
YAML
127 lines
4.2 KiB
YAML
title: Antivirus Web Shell Detection
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author: Florian Roth, Arnim Rupp
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date: 2018/09/09
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description: Detects a highly relevant Antivirus alert that reports a web shell. It's
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highly recommended to tune this rule to the specific strings used by your anti
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virus solution by downloading a big webshell repo from e.g. github and checking
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the matches.
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detection:
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SELECTION_1:
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Signature: PHP/*
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SELECTION_10:
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Signature: IIS/BackDoor*
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SELECTION_11:
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Signature: JAVA/Backdoor*
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SELECTION_12:
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Signature: Troj/ASP*
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SELECTION_13:
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Signature: Troj/PHP*
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SELECTION_14:
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Signature: Troj/JSP*
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SELECTION_15:
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Signature: '*Webshell*'
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SELECTION_16:
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Signature: '*Chopper*'
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SELECTION_17:
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Signature: '*SinoChoper*'
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SELECTION_18:
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Signature: '*ASPXSpy*'
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SELECTION_19:
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Signature: '*Aspdoor*'
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SELECTION_2:
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Signature: JSP/*
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SELECTION_20:
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Signature: '*filebrowser*'
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SELECTION_21:
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Signature: '*PHP_*'
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SELECTION_22:
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Signature: '*JSP_*'
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SELECTION_23:
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Signature: '*ASP_*'
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SELECTION_24:
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Signature: '*PHP:*'
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SELECTION_25:
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Signature: '*JSP:*'
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SELECTION_26:
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Signature: '*ASP:*'
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SELECTION_27:
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Signature: '*Perl:*'
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SELECTION_28:
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Signature: '*PHPShell*'
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SELECTION_29:
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Signature: '*Trojan.PHP*'
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SELECTION_3:
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Signature: ASP/*
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SELECTION_30:
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Signature: '*Trojan.ASP*'
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SELECTION_31:
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Signature: '*Trojan.JSP*'
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SELECTION_32:
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Signature: '*Trojan.VBS*'
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SELECTION_33:
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Signature: '*PHP?Agent*'
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SELECTION_34:
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Signature: '*ASP?Agent*'
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SELECTION_35:
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Signature: '*JSP?Agent*'
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SELECTION_36:
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Signature: '*VBS?Agent*'
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SELECTION_37:
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Signature: '*Backdoor?PHP*'
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SELECTION_38:
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Signature: '*Backdoor?JSP*'
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SELECTION_39:
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Signature: '*Backdoor?ASP*'
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SELECTION_4:
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Signature: Perl/*
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SELECTION_40:
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Signature: '*Backdoor?VBS*'
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SELECTION_41:
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Signature: '*Backdoor?Java*'
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SELECTION_5:
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Signature: PHP.*
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SELECTION_6:
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Signature: JSP.*
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SELECTION_7:
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Signature: ASP.*
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SELECTION_8:
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Signature: Perl.*
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SELECTION_9:
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Signature: VBS/Uxor*
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condition: ((SELECTION_1 or SELECTION_2 or SELECTION_3 or SELECTION_4 or SELECTION_5
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or SELECTION_6 or SELECTION_7 or SELECTION_8 or SELECTION_9 or SELECTION_10
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or SELECTION_11 or SELECTION_12 or SELECTION_13 or SELECTION_14) or (SELECTION_15
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or SELECTION_16 or SELECTION_17 or SELECTION_18 or SELECTION_19 or SELECTION_20
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or SELECTION_21 or SELECTION_22 or SELECTION_23 or SELECTION_24 or SELECTION_25
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or SELECTION_26 or SELECTION_27 or SELECTION_28 or SELECTION_29 or SELECTION_30
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or SELECTION_31 or SELECTION_32 or SELECTION_33 or SELECTION_34 or SELECTION_35
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or SELECTION_36 or SELECTION_37 or SELECTION_38 or SELECTION_39 or SELECTION_40
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or SELECTION_41))
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falsepositives:
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- Unlikely
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fields:
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- FileName
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- User
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id: fdf135a2-9241-4f96-a114-bb404948f736
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level: critical
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logsource:
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product: antivirus
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modified: 2021/05/08
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references:
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- https://www.nextron-systems.com/2021/03/25/antivirus-event-analysis-cheat-sheet-v1-8/
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- https://github.com/tennc/webshell
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- https://www.virustotal.com/gui/file/bd1d52289203866645e556e2766a21d2275877fbafa056a76fe0cf884b7f8819/detection
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- https://www.virustotal.com/gui/file/308487ed28a3d9abc1fec7ebc812d4b5c07ab025037535421f64c60d3887a3e8/detection
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- https://www.virustotal.com/gui/file/7d3cb8a8ff28f82b07f382789247329ad2d7782a72dde9867941f13266310c80/detection
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- https://www.virustotal.com/gui/file/e841675a4b82250c75273ebf0861245f80c6a1c3d5803c2d995d9d3b18d5c4b5/detection
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- https://www.virustotal.com/gui/file/a80042c61a0372eaa0c2c1e831adf0d13ef09feaf71d1d20b216156269045801/detection
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- https://www.virustotal.com/gui/file/b219f7d3c26f8bad7e175934cd5eda4ddb5e3983503e94ff07d39c0666821b7e/detection
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- https://www.virustotal.com/gui/file/b8702acf32fd651af9f809ed42d15135f842788cd98d81a8e1b154ee2a2b76a2/detection
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tags:
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- attack.persistence
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- attack.t1100
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- attack.t1505.003
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yml_filename: av_webshell.yml
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yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/malware
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