alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TA450 Nagual/STARWHALE Beacon Activity (POST)"; flow:established,to_server; urilen:>15; http.method; content:"POST"; http.uri; content:!".asp"; content:!".php"; content:!".htm"; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5)"; bsize:57; http.header_names; content:"|0d 0a|CharSet|0d 0a|Content-Length|0d 0a|Host|0d 0a 0d 0a|"; fast_pattern; content:!"Referer"; http.request_body; content:"vl="; startswith; reference:url,www.mandiant.com/resources/telegram-malware-iranian-espionage; classtype:trojan-activity; sid:2035407; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_03_08, deployment Perimeter, malware_family TA450, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_02;)