alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Maldoc Sending Windows System Information (POST)"; flow:established,to_server; http.method; content:"POST"; http.user_agent; content:"Mozilla/5.0 (Windows NT 6.1|3b 20|WOW64|3b 20|Trident/7.0|3b 20|rv|3a|11.0) like Gecko"; bsize:68; http.request_body; pcre:"/^\x26(?:(id|token))\x3d/"; content:"&session="; within:20; content:"|35 33 37 39 37 33 37 34 36 35 36 64 32 30 34 39 36 34 36 63 36 35 32 30 35 30 37 32 36 66 36 33 36 35 37 33 37 33 30 64 30 61|"; fast_pattern; within:200; http.uri; content:!"|2e|"; http.header_names; content:!"Referer"; reference:md5,7195d7e4926a0a85fbe81e40ab7c0ca4; classtype:trojan-activity; sid:2048318; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_08_30, deployment Perimeter, malware_family AtlasCross, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_09_29, reviewed_at 2023_08_30, former_sid 2855191; target:src_ip;)