alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Darkness DDoS HTTP Target/EXE"; flow:from_server,established; file_data; content:"Z"; within:1; content:"PWh0dHA"; distance:2; within:9; pcre:"/^[a-z0-9\+\/]+={0,2}$/Rsi"; classtype:trojan-activity; sid:2017775; rev:7; metadata:created_at 2013_11_27, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)