alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Suspected Stealth Soldier Backdoor Related Activity M4 (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/sensaxcv/"; startswith; fast_pattern; pcre:"/\.(?:pdf|txt|dll|exe)$/"; http.header_names; to_lowercase; content:"|0d 0a|ua-cpu|0d 0a|"; content:!"|0d 0a|referer|0d 0a|"; reference:md5,c9152cb6d094d7a8739c56c91a437fe2; reference:md5,f722013acb21448189cbae852e4a287e; reference:md5,1791cc958b2d00a884167d8e4c41fe75; reference:url,research.checkpoint.com/2023/stealth-soldier-backdoor-used-in-targeted-espionage-attacks-in-north-africa/; classtype:trojan-activity; sid:2046203; rev:2; metadata:attack_target Client_Endpoint, created_at 2023_06_12, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_27; target:src_ip;)