alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Pterodo CnC Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".html"; endswith; http.user_agent; content:"|3a 3a|"; content:"_"; distance:0; content:"|3a 3a|/."; distance:0; fast_pattern; http.header_names; content:!"Referer"; reference:md5,dddd77f42bfb365f36762ad4db4a741e; reference:md5,f4e7c05fde022ec76f8c2f0a4cf2e1b3; reference:url,twitter.com/h2jazi/status/1498017819539116033; classtype:trojan-activity; sid:2035309; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_02_28, deployment Perimeter, malware_family Gamaredon, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_02_28;)