alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Gamaredon APT Related Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".vac=?"; fast_pattern; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:url,blogs.blackberry.com/en/2023/01/gamaredon-abuses-telegram-to-target-ukrainian-organizations; classtype:trojan-activity; sid:2044007; rev:2; metadata:attack_target Client_Endpoint, created_at 2023_01_27, deployment Perimeter, malware_family Gamaredon, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_26; target:src_ip;)