alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Andromeda Download"; flow:established,to_client; flowbits:isset,ET.andromeda; http.stat_code; content:"200"; http.server; content:"nginx"; startswith; http.header; header_lowercase; content:"content-transfer-encoding|3a 20|binary|0d 0a|"; fast_pattern; content:"content-description|3a 20|File|20|Transfer|0d 0a|"; content:"content-disposition|3a 20|attachment|3b 20|filename|3d|"; pcre:"/filename=[a-f0-9]{32}v\.(?:docm|zip)\x0d\x0a/mi"; classtype:trojan-activity; sid:2022573; rev:5; metadata:created_at 2016_02_29, signature_severity Major, updated_at 2024_04_27;)