alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE LeakyStealer CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/api/beacon"; fast_pattern; http.user_agent; bsize:41; content:"Mozilla|2f|5|2e|0|20 28|Windows|20|NT|20|10|2e|0|3b 20|Win64|3b 20|x64|29|"; http.request_body; content:"|00 00 00|"; startswith; content:"LOAD"; distance:1; content:"Windows|20|"; distance:0; content:"|28|Build"; within:50; content:"|29 00 00|"; endswith; byte_jump:4,0, post_offset -1; isdataat:!2,relative; reference:url,hybrid-analysis.blogspot.com/2025/11/leakyinjector-and-leakystealer-duo.html; reference:md5,6acc510b440225207a4738fbc0d3b967; classtype:trojan-activity; sid:2065696; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_11_07, deployment Perimeter, malware_family LeakyStealer, performance_impact Low, confidence High, signature_severity Major, tag RAT, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_07, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1573, mitre_technique_name Encrypted_Channel; target:src_ip;)