alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible APT29 Compressed Payload Download Request"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/eFax/"; depth:6; content:".ZIP"; distance:0; pcre:"/^\/eFax\/[^\x2e\x2f]+\.ZIP$/"; http.host; content:"efax."; fast_pattern; startswith; classtype:targeted-activity; sid:2044215; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_11_09, deployment Perimeter, malware_family APT29_Implant, performance_impact Low, confidence Medium, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2023_02_16, former_sid 2823197;)