alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Backdoor.Atharvan CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"id="; startswith; content:"&code="; distance:0; content:"&cid=H^"; fast_pattern; distance:3; content:"&time="; distance:12; reference:url,symantec-enterprise-blogs.security.com/blogs/threat-intelligence/clasiopa-materials-research; classtype:trojan-activity; sid:2044315; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_02_23, deployment Perimeter, malware_family Win32_Backdoor_Atharvan, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_23;)