alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Trojan.Karagany C&C Response"; flow:from_server,established; file_data; content:"work|3a|"; depth:5; content:"|7c|downexec|20|"; within:20; content:".jpg|3b 0d 0a|"; distance:0; reference:url,www.symantec.com/content/en/us/enterprise/media/security_response/whitepapers/Dragonfly_Threat_Against_Western_Energy_Suppliers.pdf; classtype:command-and-control; sid:2018629; rev:3; metadata:created_at 2014_07_02, signature_severity Major, updated_at 2020_08_19;)