alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE r0 CnC Architecture POST 4"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/mipsel?ver="; startswith; fast_pattern; http.header; header_lowercase; content:"expect|3a 20|100-continue"; http.user_agent; content:"Mozilla/5.0 (Windows NT 6.3|3b 20|rv|3a|36.0) Gecko/20100101 Firefox/36.0"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:url,blog.cari.net/carisirt-defaulting-on-passwords-part-1-r0_bot/; classtype:command-and-control; sid:2021837; rev:7; metadata:created_at 2015_09_25, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_02;)