alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Chthonic Check-in"; flow:established,to_server; http.method; content:"POST"; http.uri; pcre:"/^\\x2f(?:[a-z]+\\x2f)?$/"; http.user_agent; content:"|20|MSIE|20|"; fast_pattern; pcre:"/^Mozilla\\x2f\d+\.\d+\x20\x28compatible\x3b\x20MSIE\x20\d+\.\d+\x3b\x20Windows\x20NT\x20\d+\.\d+\x3b\x20SV1\x29$/"; http.accept; content:"*/*"; startswith; endswith; http.header_names; strip_pseudo_headers; content:"|0d 0a|Accept|0d 0a|User-Agent|0d 0a|Host|0d 0a|Content-Length|0d 0a|Connection|0d 0a|"; startswith; content:!"Content-Type|0d 0a|"; content:!"Accept-|0d 0a|"; content:!"Referer|0d 0a|"; classtype:trojan-activity; sid:2019881; rev:10; metadata:created_at 2014_12_06, deprecation_reason Performance, performance_impact Significant, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_11_25;)