alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MSIL/Almashreq CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.user_agent; content:"MS|20|Web|20|Services|20|Client|20|Protocol"; fast_pattern; http.request_body; content:"<?xml"; startswith; content:"<PCName>"; distance:0; content:"<|2f|PCName>"; distance:0; content:!"<SiteID>"; http.header_names; to_lowercase; content:"|0d 0a|soapaction|0d 0a|"; content:!"|0d 0a|referer|0d 0a|"; classtype:command-and-control; sid:2027353; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_05_13, deployment Perimeter, malware_family MSIL_Almashreq, performance_impact Low, confidence High, signature_severity Major, tag Backdoor, updated_at 2024_05_01;)