alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Kimsuky APT Related Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?query=1"; fast_pattern; endswith; http.header_names; content:!"Referer"; content:"|0d 0a|Accept|0d 0a|Accept-Language|0d 0a|Accept-Encoding|0d 0a|"; startswith; reference:md5,52f79913a72c1afe1cd6b22445aab3e5; reference:url,twitter.com/ShadowChasing1/status/1493902034453479431; classtype:trojan-activity; sid:2035206; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_02_16, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_02_16;)