alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Kimsuky Maldoc Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?filename=corona"; endswith; fast_pattern; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest|2e|5)"; bsize:57; http.header_names; content:!"Referer"; reference:md5,0821884168a644f3c27176a52763acc9; reference:url,twitter.com/ShadowChasing1/status/1382509560179531782; classtype:trojan-activity; sid:2032770; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_04_15, deployment Perimeter, malware_family Kimsuky, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_04_15;)