alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE HTML/TrojanDropper.Agent.T Payload Inbound"; flow:established,to_client; http.stat_code; content:"200"; http.response_body; content:"|3c 21|DOCTYPE|20|html|3e|"; startswith; content:"|5b|17|2c|17|2c|17|2c|17|2c|17|2c|17|2c|17|2c|17|2c|17|2c|17|2c|17|2c|17|2c|17|2c|17|2c|17|2c|17|2c|17|2c|"; distance:148; within:60; fast_pattern; reference:url,unit42.paloaltonetworks.com/cloaked-ursa-online-storage-services-campaigns/; reference:md5,5f6d2af2392a37fae04c0f8c911ccc00; classtype:trojan-activity; sid:2037798; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_07_20, deployment Perimeter, deployment SSLDecrypt, malware_family Cloaked_Ursa, confidence High, signature_severity Major, tag APT29, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_10_16, reviewed_at 2023_10_16;)