alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE JS/Comm100 Trojan Backdoor Inbound"; flow:established,to_client; http.stat_code; content:"200"; http.content_type; content:"application/javascript"; http.response_body; content:"|28 28 29 3d 3e 7b|var"; startswith; fast_pattern; content:"|3d 5b 22 22 2c 22|split|22 2c 22|"; distance:0; content:"indexOf|22 2c 22 22 2c 22 22 2c 22 2e 22 2c 22|pow|22 2c 22|reduce|22 2c 22|reverse|22 2c 22|0|22 5d|"; distance:0; reference:url,crowdstrike.com/blog/new-supply-chain-attack-leverages-comm100-chat-installer; classtype:trojan-activity; sid:2039089; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_10_04, deployment Perimeter, malware_family JS_Comm100, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_04_19, reviewed_at 2024_01_26;)