alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE APT28/FancyBear Related Activity (POST)"; flow:established,to_server; http.method; content:"POST"; http.host; content:"microsoftonline.com"; http.request_body; content:"client_id=62272a08-fe9d-4825-bc65-203842ff92bc"; startswith; fast_pattern; http.header_names; content:!"Referer"; reference:url,blog.cluster25.duskrise.com/2022/09/23/in-the-footsteps-of-the-fancy-bear-powerpoint-graphite/; reference:md5,2ff3e6c9244ef965295aa60879d1aa6b; classtype:trojan-activity; sid:2038958; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_09_23, deployment Perimeter, deployment SSLDecrypt, malware_family APT28, malware_family Fancy_Bear, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_09_23;)