alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE AlphaCrypt Connectivity Check 1"; flow:established,to_server; urilen:4; http.uri; content:"/raw"; fast_pattern; http.user_agent; content:"Mozilla/5.0 (Windows NT 6.1|3b 20|rv|3a|31.0) Gecko/20100101 Firefox/31.0"; endswith; http.header_names; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; startswith; reference:md5,d0e3471f4963496cefd73744e98340aa; classtype:trojan-activity; sid:2021775; rev:5; metadata:created_at 2015_09_15, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_06;)