alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Sofacy HTTP Request check-fix.com"; flow:established,to_server; http.host; bsize:13; content:"check-fix.com"; reference:url,fireeye.com/resources/pdfs/apt28.pdf; classtype:targeted-activity; sid:2019551; rev:3; metadata:created_at 2014_10_29, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_24;)