alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Maldoc Checkin Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/Apple/script.php?a="; fast_pattern; startswith; http.user_agent; bsize:38; content:"Mozilla/3.0|20 28|compatible|3b 20|Indy|20|Library|29|"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:url,twitter.com/Timele9527/status/1435495701329317895; reference:md5,28ffba0b074218b0c9ff0360d8791bfd; classtype:trojan-activity; sid:2033915; rev:3; metadata:created_at 2021_09_08, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_20;)