alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Hangover Campaign Keylogger 2 checkin"; flow:established,to_server; http.uri; content:"/access.php"; fast_pattern; http.user_agent; content:"sendfile"; depth:8; nocase; reference:md5,0b38f87841ed347cc2a5ffa510a1c8f6; reference:url,enterprise.norman.com/resources/files/unveiling_an_indian_cyberattack_infrastructure_appendixes.pdf; classtype:command-and-control; sid:2016862; rev:5; metadata:created_at 2013_05_21, signature_severity Major, updated_at 2020_04_29;)