alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Astaroth User-Agent Observed"; flow:established,to_server; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|MSIE 7.0|3b 20|Windows NT 6.0|3b 20|SLCC1)"; depth:57; endswith; reference:md5,589d2d33825a0329f61406f0af709469; reference:url,www.cybereason.com/blog/information-stealing-malware-targeting-brazil-full-research; classtype:trojan-activity; sid:2026906; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_02_13, deployment Perimeter, former_category MALWARE, confidence Low, signature_severity Major, tag Astaroth, updated_at 2026_03_30;)