alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Gamaredon APT Related Activity (GET)"; flow:established,to_server; urilen:>20; http.method; content:"GET"; http.uri; content:".rcs"; endswith; fast_pattern; http.user_agent; content:"|3b 20|ms-office|3b 20|"; http.header_names; content:!"Referer"; reference:md5,99027f9e62dfd72ac41d47fd3ab151bd; reference:url,twitter.com/500mk500/status/1634158936608710663; classtype:trojan-activity; sid:2044556; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_03_10, deployment Perimeter, malware_family Gamaredon, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_10; target:src_ip;)