Webshell Tool Reconnaissance Activity
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About the rule
Rule Type
Standard
Rule Description
Detects processes spawned from web servers (PHP, Tomcat, IIS, etc.) that perform reconnaissance looking for the existence of popular scripting tools (perl, python, wget) on the system via the help commands
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Process started" AND (PARENTPROCESSNAME endswith "\caddy.exe,\httpd.exe,\nginx.exe,\php-cgi.exe,\w3wp.exe,\ws_tomcatservice.exe" OR (PARENTPROCESSNAME endswith "\java.exe,\javaw.exe" AND PARENTPROCESSNAME contains "-tomcat-,\tomcat") OR (PARENTPROCESSNAME endswith "\java.exe,\javaw.exe" AND COMMANDLINE contains "CATALINA_HOME,catalina.jar")) AND COMMANDLINE contains "perl --help,perl -h,python --help,python -h,python3 --help,python3 -h,wget --help" select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Cian Heasley, Florian Roth (Nextron Systems)
