alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE APT29 Duke Variant Malware CnC Checkin Observed"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/api/v1/users/me/subscriptions"; http.user_agent; content:"curl/"; http.host; content:"toyy.zulipchat.com"; fast_pattern; reference:url,blog.eclecticiq.com/german-embassy-lure-likely-part-of-campaign-against-nato-aligned-ministries-of-foreign-affairs; classtype:trojan-activity; sid:2047644; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2023_08_14, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, updated_at 2023_08_14; target:src_ip;)