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proc_creation_lnx_webshell_detection.yml
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/
proc_creation_lnx_webshell_detection.yml
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title: Linux Webshell Indicators
id: 818f7b24-0fba-4c49-a073-8b755573b9c7
status: test
description: Detects suspicious sub processes of web server processes
references:
- https://www.acunetix.com/blog/articles/web-shells-101-using-php-introduction-web-shells-part-2/
- https://media.defense.gov/2020/Jun/09/2002313081/-1/-1/0/CSI-DETECT-AND-PREVENT-WEB-SHELL-MALWARE-20200422.PDF
author: Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
date: 2021/10/15
modified: 2022/12/28
tags:
- attack.persistence
- attack.t1505.003
logsource:
product: linux
category: process_creation
detection:
selection_general:
ParentImage|endswith:
- '/httpd'
- '/lighttpd'
- '/nginx'
- '/apache2'
- '/node'
- '/caddy'
selection_tomcat:
ParentCommandLine|contains|all:
- '/bin/java'
- 'tomcat'
selection_websphere: # ? just guessing
ParentCommandLine|contains|all:
- '/bin/java'
- 'websphere'
sub_processes:
Image|endswith:
- '/whoami'
- '/ifconfig'
- '/ip'
- '/bin/uname'
- '/bin/cat'
- '/bin/crontab'
- '/hostname'
- '/iptables'
- '/netstat'
- '/pwd'
- '/route'
condition: 1 of selection_* and sub_processes
falsepositives:
- Web applications that invoke Linux command line tools
level: high