alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TA430/Andariel APT BottomLoader Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".gif?index="; fast_pattern; pcre:"/^[0-9]{1}$/R"; http.user_agent; content:"powershell"; nocase; http.header_names; content:!"Referer"; reference:md5,f8f7eced1411d76e2a0319151ecf80b7; reference:url,blog.talosintelligence.com/lazarus_new_rats_dlang_and_telegram/; classtype:trojan-activity; sid:2049684; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_12_12, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_12; target:src_ip;)