alert tcp $EXTERNAL_NET 1024: -> $HOME_NET any (msg:"ET MALWARE [PTsecurity] DorkBot.Downloader CnC Response"; flow:established,to_client; dsize:517; content:"|45 36 27 18|"; depth:4; fast_pattern; content:"|00 00 00 00 00 00 00 00 00 00 00 00 00 00|"; distance:0; reference:url,www.freebuf.com/articles/terminal/153428.html; reference:url,research.checkpoint.com/dorkbot-an-investigation/; classtype:command-and-control; sid:2025152; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_12_15, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)