alert tcp $EXTERNAL_NET 20000: -> $HOME_NET 1024: (msg:"ET MALWARE Sourtoff Receiving Simda Payload"; flow:established,from_server; flowbits:isset,ET.TROJAN.Sourtoff; dsize:1300<>1500; content:"|0a c0|"; depth:2; reference:md5,5469af0daa10f8acbe552cd2f1f6a6bb; classtype:trojan-activity; sid:2019313; rev:3; metadata:created_at 2014_09_29, signature_severity Major, updated_at 2019_07_26;)