alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspected Fancy Bear (APT28) Maldoc CnC"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.user_agent; content:"Windows|20|NT|20|6.1|3b 20|WOW64|3b|"; bsize:22; http.request_body; content:"IB="; startswith; fast_pattern; content:"&log="; distance:0; reference:url,twitter.com/RedDrip7/status/1362343352759250946?s=20; reference:md5,c9a43fd6623bf0bc287012b6ee10a98e; reference:md5,49696043b51acca6ced2ab213bd4abef; classtype:command-and-control; sid:2031628; rev:2; metadata:attack_target Client_Endpoint, created_at 2021_02_18, deployment Perimeter, malware_family APT28, malware_family Fancy_Bear, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_02_18;)