alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Renos.Downloader User Agent zeroup"; flow:established,to_server; http.header; content:"User-Agent|3A 20|zeroup"; reference:url,www.f-secure.com/v-descs/trojan_w32_renos_h.shtml; reference:md5,35ba53f6aeb6b38c1107018f271189af; classtype:trojan-activity; sid:2014817; rev:3; metadata:created_at 2012_05_25, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_21;)