alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Irafau Backdoor CnC Activity (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:>44; content:"/search?q="; startswith; content:"02X"; distance:3; within:3; content:"02X&cvid="; distance:15; within:21; fast_pattern; content:"llu"; endswith; reference:url,bitdefender.com/files/News/CaseStudies/study/426/Bitdefender-PR-Whitepaper-BackdoorDiplomacy-creat6507-en-EN.pdf; classtype:trojan-activity; sid:2042163; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_12_07, deployment Perimeter, malware_family Win32_Irafau, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_12_07;)