alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Darkgate Stealer CnC Checkin (POST) M2"; flow:established,to_server; http.start; content:"POST / HTTP/1.0|0d 0a|Host|3a 20|"; startswith; fast_pattern; http.user_agent; bsize:33; content:"Mozilla/4.0 (compatible|3b 20|Synapse)"; http.header; content:"|0d 0a|Keep-Alive|3a 20|300|0d 0a|"; http.header_names; content:"|0d 0a|Host|0d 0a|Keep-Alive|0d 0a|Connection|0d 0a|User-Agent|0d 0a|"; startswith; content:!"Referer"; content:!"Accept"; http.connection; bsize:10; content:"keep-alive"; reference:url,malware-traffic-analysis.net/2023/11/30/index.html; classtype:trojan-activity; sid:2049433; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_12_01, deployment Perimeter, malware_family DarkGate, confidence Medium, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_03;)