Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Manjusaka C2 Client Heartbeat"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/global/favicon.png"; bsize:19; fast_pattern; http.content_len; content:"2"; bsize:1; http.user_agent; content:"Mozilla|2f|5|2e|0|20 28|Windows|20|NT|20|8|2e|0|3b 20|WOW64|3b 20|rv|3a|"; startswith; http.request_body; content:"|19 1a|"; bsize:2; threshold:type limit, seconds 360, count 1, track by_src; reference:url,corelight.com/blog/detecting-manjusaka-c2-framework; classtype:command-and-control; sid:2039601; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_10_31, deployment Perimeter, deployment SSLDecrypt, malware_family Manjusaka, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_10_31, reviewed_at 2025_10_24;)