alert tcp $HOME_NET any -> $EXTERNAL_NET 5100 (msg:"GPL RETIRED Yahoo IM conference request"; flow:established,to_server; content:"<R"; depth:2; pcre:"/^\x3c(REQIMG|RVWCFG)\x3e/ism"; classtype:policy-violation; sid:2102460; rev:7; metadata:created_at 2010_09_23, former_category CHAT, confidence Medium, signature_severity Informational, updated_at 2026_08_28;)