alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Trojan:Win32/WinLNK.APA!MTB Payload Request"; flow:established,to_server; http.method; content:"GET"; http.request_line; content:"|7e 7e 2f| HTTP|2f|1|2e|1"; endswith; bsize:99; fast_pattern; http.uri; pcre:"/^(?:\x2f[A-Za-z0-9]{10}\x2f[A-Za-z0-9_-]{34}\x7e\x7e\x2f[A-Za-z0-9_-]{34}\x7e\x7e\x2f$)$/"; bsize:86; http.host; pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/"; http.user_agent; content:"curl"; startswith; http.header_names; content:!"Referer"; reference:md5,4d5c65cb916244375eacde678148334b; reference:url,twitter.com/pr0xylife/status/1561737165255725057; classtype:trojan-activity; sid:2038597; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_08_23, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_23, reviewed_at 2025_10_24;)