alert udp $EXTERNAL_NET any -> $HOME_NET 5060 (msg:"ET VOIP Possible Modified Sipvicious OPTIONS Scan"; content:"OPTIONS "; depth:8; content:"ccxllrlflgig|22|<sip|3A|100"; nocase; distance:0; reference:url,code.google.com/p/sipvicious/; reference:url,blog.sipvicious.org/; classtype:attempted-recon; sid:2011422; rev:2; metadata:created_at 2010_09_28, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)