alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Corebot Checkin"; flow:to_server,established; http.method; content:"POST"; http.user_agent; content:"Mozilla/5.0 (compatible|3b 20|MSIE 10.0|3b 20|Windows NT 6.1|3b 20|WOW64|3b 20|Trident/6.0)"; startswith; http.request_body; content:"AQAAA"; fast_pattern; depth:5; http.header_names; content:!"Accept"; content:!"Referer|0d 0a|"; content:!"Content-Type|0d 0a|"; reference:md5,0f6a9b15bd9fd719bb96491e16eb2f9c; reference:url,securityintelligence.com/watch-out-for-corebot-new-stealer-in-the-wild/; classtype:command-and-control; sid:2021739; rev:3; metadata:created_at 2015_08_31, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_01;)