alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE DangerousPassword APT Style Request (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; pcre:"/^\x2f(?:[A-Za-z0-9+\x2f]{4})*(?:[A-Za-z0-9+\x2f]{2}==|[A-Za-z0-9+\x2f]{3}=|[A-Za-z0-9+\x2f]{4})$/R"; content:"=.msi"; fast_pattern; endswith; http.user_agent; bsize:17; content:"Windows Installer"; http.header_names; content:"|0d 0a|Connection|0d 0a|Accept|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; startswith; reference:md5,42e5cebc15f181647e79bcc19784d08d; reference:url,twitter.com/h2jazi/status/1602314600753598465; classtype:trojan-activity; sid:2042655; rev:3; metadata:attack_target Client_Endpoint, created_at 2022_12_12, deployment Perimeter, deployment SSLDecrypt, malware_family DangerousPassword, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_07_30; target:src_ip;)