alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE RedLine Stealer - CheckConnect Response"; flow:established,to_client; http.response_body; bsize:212; content:"|3c|s|3a|Envelope|20|xmlns|3a|s|3d 22|http|3a 2f 2f|schemas|2e|xmlsoap|2e|org|2f|soap|2f|envelope|2f 22 3e 3c|s|3a|Body|3e 3c|CheckConnectResponse|20|xmlns|3d 22|http|3a 2f 2f|tempuri|2e|org|2f 22 3e 3c|CheckConnectResult|3e|true|3c 2f|CheckConnectResult|3e 3c 2f|CheckConnectResponse|3e 3c 2f|s|3a|Body|3e 3c 2f|s|3a|Envelope|3e|"; fast_pattern; reference:url,fortinet.com/blog/threat-research/excel-document-delivers-multiple-malware-exploiting-cve-2017-11882-part-two; reference:url,witter.com/crep1x/status/1648063045808148481; reference:md5,43967615d9e0e19bc59d32fdb5afd7e4; classtype:command-and-control; sid:2045000; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_04_17, deployment Perimeter, malware_family Redline, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_13, reviewed_at 2024_01_26;)