alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Kaseya VSA Exploit Activity M1 (SET)"; flow:established,to_server; http.request_line; content:"POST|20|/dl.asp|20|"; fast_pattern; startswith; http.user_agent; content:"curl/"; startswith; flowbits:set,ET.kaseya1; flowbits:noalert; reference:url,www.huntress.com/blog/rapid-response-kaseya-vsa-mass-msp-ransomware-incident; classtype:trojan-activity; sid:2033248; rev:1; metadata:affected_product Kaseya_VSA, attack_target Web_Server, created_at 2021_07_06, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_06;)