Query: detect Detects suspicious sub processes of web server processes in logs
Matching passage: Sigma rule: Detects suspicious sub processes of web server processes. Logsource: linux / process_creation. Rule: 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: 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
Near-miss passage: Sigma rule: Detects suspicious PowerShell invocation command parameters. Logsource: windows / ps_script. Rule: title: Suspicious PowerShell Invocations - Specific id: ae7fbf8e-f3cb-49fd-8db4-5f3bed522c71 related: - id: fce5f582-cc00-41e1-941a-c6fabf0fdb8c type: obsolete - id: 8ff28fdd-e2fa-4dfa-aeda-ef3d61c62090 type: similar - id: 536e2947-3729-478c-9903-745aaffe60d2 type: similar status: test description: Detects suspicious PowerShell invocation command parameters references: - Internal Research - https://github.com/HackTricks-wiki/hacktricks/blob/e4c7b21b8f36c97c35b7c622732b38a189ce18f7/src/windows-hardening/windows-local-privilege-escalation/privilege-escalation-with-autorun-binaries.md author: Florian Roth (Nextron Systems), Jonhnathan Ribeiro date: 2017-03-05 modified: 2025-02-17 tags: - attack.execution - attack.t1059.001 logsource: product: windows category: ps_script definition: 'Requirements: Script Block Logging must be enabled' detection: selection_convert_b64: ScriptBlockText|contains|all: - -nop - ' -w ' - hidden - ' -c ' - '[Convert]::FromBase64String' selection_iex_selection: ScriptBlockText|contains|all: - ' -w ' - hidden - -noni - -nop - ' -c ' - iex - New-Object selection_enc_selection: ScriptBlockText|contains|all: - ' -w ' - hidden - -ep - bypass - -Enc selection_reg_selection: ScriptBlockText|contains|all: - powershell - reg - add ScriptBlockText|contains: - \software\microsoft\windows\currentversion\run - \software\wow6432node\microsoft\windows\currentversion\run - \software\microsoft\windows\currentversion\policies\explorer\run selection_webclient_selection: ScriptBlockText|contains|all: - bypass - -noprofile - -windowstyle - hidden - new-object - system.net.webclient - .download selection_iex_webclient: ScriptBlockText|contains|all: - iex - New-Object - Net.WebClient - .Download filter_chocolatey: ScriptBlockText|contains: - (New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1 - (New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1') - Write-ChocolateyWarning condition: 1 of selection_* and not 1 of filter_* falsepositives: - Unknown level: high