alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/DarkWatchman Checkin Activity (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.header_names; content:"X-Client-Id|0d 0a|"; content:"X-Client-Controller|0d 0a|"; fast_pattern; content:"X-Client-Ut|0d 0a|"; http.request_body; content:"os="; startswith; content:"&cn="; distance:0; content:"&un="; distance:0; content:"&b="; distance:0; content:"&l="; distance:0; content:"av="; distance:0; reference:url,prevailion.com/darkwatchman-new-fileness-techniques/; reference:md5,2ccc9637823753de9cdcdf76a1d22725; classtype:trojan-activity; sid:2034745; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_12_16, deployment Perimeter, malware_family Win32_DarkWatchman, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_02_14, reviewed_at 2024_06_26;)