alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Suspicious Chmod Usage in URI (Outbound)"; flow:to_server,established; http.uri; content:"chmod"; fast_pattern; nocase; content:!"&launchmode="; content:!"/chmod/"; content:!"searchmod"; pcre:"/^(?:\+|\x2520|\x24IFS|\x252B|\s)+(?:x|[0-9]{3,4})/Ri"; classtype:attempted-admin; sid:2029216; rev:3; metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2019_12_31, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_27;)