alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspected Kimsuky Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"list.php?query=1"; endswith; fast_pattern; http.user_agent; content:"Mozilla/4.0|20 28|compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5|29|"; bsize:57; http.header_names; content:!"Referer"; reference:md5,04a0505cc45d2dac4be9387768efcb7c; reference:md5,d8e817abd5ad765bf7acec5d672cbb8d; classtype:trojan-activity; sid:2033012; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_05_21, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_21;)