alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Darkgate Stealer CnC Checkin"; 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.request_body; content:"id="; startswith; content:"&data="; distance:32; within:6; content:"&act="; isdataat:!5,relative; reference:md5,23a45a5658dc1989c54f5bd9139c007a; reference:url,www.aon.com/cyber-solutions/aon_cyber_labs/darkgate-keylogger-analysis-masterofnone/; reference:md5,793c0217717b0a37794f7c3adbeda577; classtype:command-and-control; sid:2048089; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_05_28, deployment Perimeter, malware_family DarkGate, performance_impact Low, confidence High, signature_severity Major, updated_at 2023_09_14, reviewed_at 2023_09_14, former_sid 2842772; target:src_ip;)