Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Goofy Guineapig CnC Activity (GET) M2"; flow:established,to_server; http.request_line; content:"GET / HTTP/1.1"; bsize:15; http.header_names; content:"Authorization|0d 0a|User-Agent|0d 0a|"; http.user_agent; content:"Mozilla|2f|5|2e|0|20 28|Windows|20|NT|20|6|2e|1|3b 20|WOW64|29 20|AppleWebKit|2f|537|2e|36|20 28|KHTML|2c 20|like|20|Gecko|29 20|Chrome|2f|54|2e|0|2e|2840|2e|71|20|Safari|2f|537|2e|36"; bsize:108; fast_pattern; http.header; content:!"Authorization|3a 20|Basic"; content:!"Authorization|3a 20|Digest"; pcre:"/Authorization\x3a\x20[a-zA-Z0-9\x2f\+=]{90,120}\x0d\x0a/"; reference:md5,a21dec89611368313e138480b3c94835; classtype:command-and-control; sid:2042946; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_12_15, deployment Perimeter, deployment SSLDecrypt, malware_family Win32_Goofy, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_12_15, reviewed_at 2025_10_24;)