alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE ICEFOG-P Variant CnC Checkin M2"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".jpg"; pcre:"/_[A-F0-9]{12}&filename=\w{1,20}\.jpg$/i"; http.request_body; content:"|00 3a 00 7c 00|d|00|i|00|s|00|k|00|"; depth:15; fast_pattern; reference:url,speakerdeck.com/ashley920/into-the-fog-the-return-of-icefog-apt; classtype:command-and-control; sid:2027432; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, created_at 2019_06_04, deployment Perimeter, malware_family ICEFOG_P, performance_impact Low, confidence High, signature_severity Major, tag APT, tag IceFog, updated_at 2020_08_31;)