alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Gamaredon APT Related Maldoc Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".maxc"; endswith; fast_pattern; http.user_agent; content:"|3b 20|ms-office|3b 20|"; content:!"Linux"; content:!"Android"; http.header_names; content:!"Referer"; reference:md5,8842acb150e1625ff20a84190073ece6; reference:url,twitter.com/500mk500/status/1498769941998223366; classtype:trojan-activity; sid:2035391; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_03_03, deployment Perimeter, malware_family Gamaredon, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_03;)