alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Downeks Checkin"; flow:established,to_server; urilen:7; http.method; content:"GET"; http.uri; content:"/dw/gtk"; fast_pattern; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; content:!"|0d 0a|User-Agent|0d 0a|"; content:"|0d 0a|Host|0d 0a|"; startswith; reference:url,pwc.blogs.com/cyber_security_updates/2015/04/attacks-against-israeli-palestinian-interests.html; classtype:command-and-control; sid:2021028; rev:6; metadata:created_at 2015_04_28, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_07;)