alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"REMOTE [PTsecurity] XWorm"; flow:established, to_server; stream_size:client, =, 197; stream_size:server, <, 3; dsize:196; content:"192|00|"; depth:4; isdataat:191, relative; isdataat:!193, relative; content:!"|7c 27 7c|"; content:!"|7c|yes"; nocase; content:!"|7c|win"; nocase; content:!"|7c|no"; nocase; reference:url, rules.ptsecurity.com; classtype:trojan-activity; sid:10013662; rev:2;)