alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Arkei/Vidar/Mars Stealer Variant DLL GET Request"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/"; pcre:"/^(?:sqlite|mozglue|nss3|freebl3|softokn3)/R"; content:".dll"; endswith; http.user_agent; content:"RT/1.0"; fast_pattern; bsize:6; http.header_names; content:!"Referer"; reference:md5,844ab1b8a2db0242a20a6f3bbceedf6b; classtype:trojan-activity; sid:2038524; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_08_15, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_15, reviewed_at 2025_07_14;)