alert tcp $EXTERNAL_NET 1024: -> $HOME_NET any (msg:"ET MALWARE Lethic Spambot CnC Initial Connect"; flow:established,from_server; flowbits:isnotset,ET.lethic.init; flowbits:set,ET.lethic.init; flowbits:noalert; dsize:5; content:"|00 00 00 00 06|"; reference:url,www.m86security.com/trace/spambotitem.asp?article=1205; classtype:command-and-control; sid:2010646; rev:3; metadata:created_at 2010_07_30, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)