alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Sednit/AZZY Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/"; offset:1; http.user_agent; content:"MSIE|20|"; startswith; fast_pattern; pcre:"/^MSIE \d+\.\d+$/i"; http.header_names; to_lowercase; content:!"|0d 0a|content-type|0d 0a|"; content:!"|0d 0a|referer|0d 0a|"; content:!"|0d 0a|accept"; reference:md5,7c373c607c8724f8be461d61016ed272; reference:url,www.fireeye.com/resources/pdfs/apt28.pdf; reference:url,securelist.com/blog/research/72924/sofacy-apt-hits-high-profile-targets-with-updated-toolset/; classtype:targeted-activity; sid:2019534; rev:7; metadata:created_at 2014_10_28, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_28;)