alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Lurk Downloader Check-in"; flow:to_server,established; http.method; content:"GET"; http.uri; content:"/lolo/"; startswith; fast_pattern; content:".html"; endswith; pcre:"/^\/lolo\/[0-9]+\/[0-9]+\/[0-9]+\/[0-9]+\.html$/"; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|MSIE 8.0|3b 20|Windows NT 5.1|3b 20|Trident/4.0)"; reference:url,secureworks.com/cyber-threat-intelligence/threats/malware-analysis-of-the-lurk-downloader/; classtype:trojan-activity; sid:2018926; rev:4; metadata:created_at 2014_08_12, signature_severity Major, updated_at 2020_05_01;)