alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TA402/Molerats Pierogi Backdoor Activity"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"cname="; depth:6; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})/R"; content:"&av="; within:40; content:"&osversion="; within:50; content:"&aname="; within:50; fast_pattern; content:"&ver="; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R"; http.header_names; content:!"Referer|0d 0a|"; content:!"User-Agent|0d 0a|"; reference:url,www.cybereason.com/blog/new-cyber-espionage-campaigns-targeting-palestinians-part-2-the-discovery-of-the-new-mysterious-pierogi-backdoor; classtype:targeted-activity; sid:2029431; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_02_13, deployment Perimeter, malware_family Molerats, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_29;)