alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Kaseya VSA Exploit Activity M2 (SET)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/cgi-bin/KUpload.asp"; fast_pattern; endswith; http.user_agent; content:"curl/"; startswith; flowbits:set,ET.kaseya2; flowbits:noalert; reference:url,www.huntress.com/blog/rapid-response-kaseya-vsa-mass-msp-ransomware-incident; classtype:trojan-activity; sid:2033249; rev:2; 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 2023_03_10, reviewed_at 2024_03_06;)