alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Kimsuky APT Related Host Data Exfil M5"; flow:established,to_server; http.method; content:"POST"; http.uri; pcre:"/^\/\?m=[abcde]&p1=[a-f0-9-]{8,40}(?:&p2=[^&]+)?(?:&p3=[^&]+)?$/i"; http.uri.raw; content:"//?m="; startswith; fast_pattern; content:"&p1="; distance:1; within:4; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:md5,0684d80e91581730f814e831f703bf5b; reference:url,twitter.com/s1ckb017/status/1507316584079142915; classtype:trojan-activity; sid:2035611; rev:4; metadata:created_at 2022_03_25, malware_family Kimsuky, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_01;)