alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Datoploader Activity M2 (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; pcre:"/^\/[a-zA-Z0-9]{9,12}\/x\.html$/"; http.request_line; content:"/x.html HTTP/1.1"; endswith; fast_pattern; http.header_names; content:"|0d 0a|Accept|0d 0a|Accept-Encoding|0d 0a|User-Agent|0d 0a|"; startswith; content:!"Referer"; reference:md5,d868b389f2f824a32367767a17b397b8; reference:url,www.trendmicro.com/en_us/research/21/k/Squirrelwaffle-Exploits-ProxyShell-and-ProxyLogon-to-Hijack-Email-Chains.html; classtype:trojan-activity; sid:2034546; rev:2; metadata:attack_target Client_Endpoint, created_at 2021_11_24, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_11_24;)