alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Unknown CN Related APT Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/update/v32/default"; startswith; fast_pattern; http.header_names; content:!"Referer"; http.user_agent; content:"Mozilla/5.0 (Windows NT 6.3|3b 20|Trident/7.0|3b 20|rv|3a|11.0) like Gecko"; bsize:61; reference:url,twitter.com/h2jazi/status/1537536029250490382; reference:md5,8cdd56b2b4e1e901f7e728a984221d10; classtype:trojan-activity; sid:2037035; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_06_17, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_06_17;)