alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Grandoreiro TCP CnC Activity"; flow:established,to_server; stream_size:server,<,5; content:"/GET|20|"; startswith; fast_pattern; content:"|0d 0a|HOST|3a 20|"; distance:0; nocase; pcre:"/^\/GET\s[A-F0-9]{30,400}\sHTTP\/1\.1\r\nH[Oo][Ss][Tt]\x3a\x20[^\r\n]+[\r\n]+$/"; reference:md5,0f3f51ba3377fe7b270c92dd7ea26bd8; reference:url,app.any.run/tasks/333283ad-217d-4095-89b6-6d4810341882/; classtype:trojan-activity; sid:2044346; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_02_27, deployment Perimeter, malware_family Grandoreiro, performance_impact Low, confidence High, signature_severity Major, tag RAT, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_27; target:src_ip;)