Suspicious IIS URL GlobalRules Rewrite Via AppCmd
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About the rule
Rule Type
Standard
Rule Description
Detects usage of "appcmd" to create new global URL rewrite rules. This behaviour has been observed being used by threat actors to add new rules so they can access their webshells.
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "Process started" AND (PROCESSNAME endswith "\appcmd.exe" OR ORIGINALFILENAME = "appcmd.exe") AND (COMMANDLINE contains "set" AND COMMANDLINE contains "config" AND COMMANDLINE contains "section:system.webServer/rewrite/globalRules" AND COMMANDLINE contains "commit:") select Action1.HOSTNAME,Action1.MESSAGE,Action1.COMMANDLINE,Action1.FILE_NAME,Action1.PROCESSNAME,Action1.USERNAME,Action1.PARENTPROCESSNAME
Detection
Execution Mode
realtime
Log Sources
Windows
Author
Nasreddine Bencherchali (Nextron Systems)
