alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Trojan.Kwampirs Outbound GET request"; flow:to_server,established; urilen:>21; http.method; content:"GET"; http.uri; content:"?q=KT"; fast_pattern; pcre:"/\.(?:aspx?|php)\?q=(?=KT)(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$/"; http.user_agent; content:"Mozilla/"; depth:8; http.header_names; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|"; depth:20; content:!"Referer|0d 0a|"; content:!"Cookie|0d 0a|"; content:!"Accept"; reference:md5,1f1b5c16bbb62387fdf53e524a382006; reference:url,www.symantec.com/security_response/writeup.jsp?docid=2016-081923-2700-99&tabid=2; classtype:trojan-activity; sid:2023595; rev:6; metadata:attack_target Client_Endpoint, created_at 2016_12_09, deployment Perimeter, malware_family Trojan_Kwampirs, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_11_04;)