alert http $EXTERNAL_NET any -> $HTTP_SERVERS any (msg:"ET HUNTING Suspicious Chmod Usage in URI (Inbound)"; flow:to_server,established; http.uri; content:"chmod"; fast_pattern; nocase; pcre:"/^(?:\+|\x2520|\x24IFS|\x252B|\s)+(?:x|[0-9]{3,4})/Ri"; content:!"&launchmode="; content:!"/chmod/"; content:!"searchmod"; classtype:attempted-admin; sid:2009363; rev:10; metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2010_07_30, deployment Perimeter, confidence Medium, signature_severity Minor, updated_at 2020_10_27;)