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:"/perceive.cfg"; endswith; fast_pattern; http.user_agent; content:"|3b 20|ms-office|3b 20|"; http.header_names; content:!"Referer"; reference:url,twitter.com/ShadowChasing1/status/1504444062425747456; reference:md5,ef5017d8e7724f73d370e1b77d276d3c; classtype:trojan-activity; sid:2035517; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_03_17, deployment Perimeter, malware_family Gamaredon, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_02;)