alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspected Lazarus APT Related Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; pcre:"/^\/(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/"; http.host; content:"www.onlinedocpage.org"; bsize:21; fast_pattern; http.header_names; content:!"Referer"; reference:md5,c44d866adf8c6845b7dda742c59c6b59; reference:url,twitter.com/ShadowChasing1/status/1448150917912559616; classtype:trojan-activity; sid:2034187; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_10_14, deployment Perimeter, deployment SSLDecrypt, malware_family Lazarus, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_10_14;)