alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE WallStealer CnC Checkin - get_dll Request"; flow:established,to_server; flowbits:set,ET.WallStealer.Checkin; http.method; content:"POST"; http.uri; bsize:11; content:"/api/client"; http.user_agent; content:"systeminfo|20|client|2f|"; nocase; startswith; http.request_body; content:"|7b 22|type|22 3a 22|get_dll|22 2c 22|dll_name|22 3a 22|"; fast_pattern; startswith; reference:url,bazaar.abuse.ch/sample/903cdf6c4bef90c7bcdacd909cc7e9c2be528a4de785f0aa2c19c6a1e4166a53/; reference:md5,6dac8ea22fcefdb84142c0ffc62ffb18; classtype:trojan-activity; sid:2065825; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_11_19, deployment Perimeter, malware_family WallStealer, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_19, mitre_tactic_id TA0009, mitre_tactic_name Collection, mitre_technique_id T1005, mitre_technique_name Data_from_local_system; target:src_ip;)