alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Darkme Trojan Checkin M1"; flow:established,to_server; content:"92|a9 a9 a9|"; startswith; fast_pattern; pcre:"/^[A-Z]{2}/R"; content:"|a9|"; distance:0; reference:url,blog.nsfocus.net/darkcasino-apt-evilnum; classtype:trojan-activity; sid:2036835; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2022_06_03, deployment Perimeter, malware_family Darkme, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_06_03;)