alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MICROPSIA CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:!"."; content:!"&"; http.user_agent; content:"Mozilla/5.0 (compatible|3b 20|Googlebot/2.1|3b 20|+http|3a 2f 2f|www.google|2e|com/bot.html)"; bsize:72; http.request_body; content:"="; depth:25; content:"&"; distance:0; content:"="; distance:0; within:25; content:"=V2luZG93cy"; distance:0; fast_pattern; http.header_names; content:!"Referer"; reference:url,unit42.paloaltonetworks.com/pymicropsia/; classtype:trojan-activity; sid:2031371; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_12_14, deployment Perimeter, confidence High, signature_severity Major, updated_at 2020_12_14;)