alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Kimsuky Related Activity (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/?m="; fast_pattern; offset:4; pcre:"/^[a-z]{1}/R"; content:"&p1="; distance:0; content:"&p2="; distance:0; http.header_names; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|Content-Length|0d 0a|Cache-Control|0d 0a 0d 0a|"; bsize:53; http.content_len; byte_test:0,=,0,0,string,dec; reference:md5,739d14336826d078c40c9580e3396d15; reference:url,twitter.com/Timele9527/status/1407610627011403779; classtype:trojan-activity; sid:2033199; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_06_28, deployment Perimeter, malware_family Kimsuky, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_06_28;)