alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/LockScreen.BW Checkin"; flow:established,to_server; http.method; content:"POST"; http.user_agent; content:"Mozilla/5.0 (Windows NT 6.1|3b 20|rv|3a|11.0)"; depth:37; http.request_body; content:"locker_ver="; fast_pattern; content:"&i_firstboot="; distance:0; content:"&harddiskserial="; distance:0; http.referer; content:"http|3a|//mysticnews.ru"; startswith; reference:md5,c74d4633e0593879d5e1321d9021e708; classtype:command-and-control; sid:2020829; rev:4; metadata:created_at 2015_04_02, malware_family Win32_LockScreen_BW, signature_severity Major, updated_at 2020_10_14;)