alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE APT28 Zebrocy/Zekapab CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; isdataat:2,relative; http.user_agent; content:"browser"; depth:7; endswith; fast_pattern; http.request_body; content:"|0d 0a|Host|20|Name|3a|"; depth:300; content:"OS|20|Configuration|3a|"; distance:0; content:"|0d 0a|Registered|20|Organization|3a|"; distance:0; content:"Original|20|Install|20|Date|3a|"; distance:0; reference:md5,d09b5ae50e7ce1eb2db2e5d72292e907; classtype:targeted-activity; sid:2044218; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_04_25, deployment Perimeter, malware_family Zebrocy, performance_impact Low, confidence High, signature_severity Major, tag APT, updated_at 2023_02_16, former_sid 2836072;)