alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Geocon CnC Request"; flow:established,to_server; http.method; content:"GET"; http.user_agent; content:"Mozilla/5.0 (compatible|3b 20|MSIE 9.0|3b 20|Windows NT 6.0|3b 20|Trident/5.0|3b 20|BOIE9|3b|ENUS)"; fast_pattern; bsize:76; http.cookie; bsize:172; reference:url,blog.netlab.360.com/blackrota-an-obfuscated-backdoor-written-in-go-en/; reference:url,github.com/darkr4y/geacon/blob/5d9a9101c1f3b7dfb71484a58db5cc51ea279583/cmd/packet/http.go; reference:md5,6e020db51665614f4a2fd84fb0f83778; classtype:command-and-control; sid:2031237; rev:1; metadata:attack_target Client_Endpoint, created_at 2020_11_25, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_25;)