alert http $HOME_NET any -> $EXTERNAL_NET any (
msg:"ET MALWARE Mustang Panda APT Related Activity (GET)";
flow:established,to_server;
flowbits:set,ET.mustangpanda.numbymane;
urilen:1;
http.method;
content:"GET";
http.header_names;
content:"|0d 0a|User-Agent|0d 0a|Sec-Dest|0d 0a|Sec-Site|0d 0a|Host|0d 0a 0d 0a|"; endswith;
http.header;
content:"|0d 0a|Sec-Dest|3a 20|"; fast_pattern;
pcre:"/^[0-9A-Za-z]{8}\r\n/R";
content:"Sec-Site|3a 20|"; distance:0;
pcre:"/^[0-9A-F]{20}\r\n/R";
reference:url,twitter.com/StopMalvertisin/status/1635620870214352901;
reference:url,twitter.com/t3ft3lb/status/1635597523434762240;
reference:md5,15c74f8c597d2937abae779ee5ef95d7;
reference:md5,821ec39800471963a4ccef10b587b8d6;
classtype:trojan-activity;
sid:2044639; rev:1;
metadata:attack_target Client_Endpoint, created_at 2023_03_16, deployment Perimeter, deployment SSLDecrypt, malware_family MustangPanda, malware_family NUMBYMANE, performance_impact Low, confidence High, signature_severity Major, tag TA416, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_16;
)