alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Upatre.Downloader Encoded Binary Download Request"; flow:established,to_server; http.uri; content:"/mandoc/"; fast_pattern; startswith; content:".pdf"; distance:0; http.header; strip_pseudo_headers; header_lowercase; content:"accept|3a 20|text|2f 2a 2c 20|application|2f 2a 0d 0a|user-agent|3a 20|"; startswith; reference:url,phishme.com/evolution-upatre-dyre/; classtype:trojan-activity; sid:2020294; rev:5; metadata:created_at 2015_01_23, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_30;)