alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED BlueShtorm Infostealer Data Exfiltration"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/upload.php"; endswith; http.header_names; content:"|0d 0a|Content-Type|0d 0a|Host|0d 0a|Content-Length|0d 0a|Expect|0d 0a|Connection|0d 0a 0d 0a|"; bsize:60; http.request_body; content:"filename|3d 22|Log.zip|22 0d 0a|"; fast_pattern; content:"PK|03 04|"; distance:0; byte_test:1,<=,20,0,relative; content:"System Info.txt"; distance:0; reference:md5,1b02c34f6a49e9ba0c9b9a834a052c13; reference:url,twitter.com/3xp0rtblog/status/1526603444898959362; classtype:trojan-activity; sid:2036610; rev:4; metadata:attack_target Client_Endpoint, created_at 2022_05_17, deployment Perimeter, former_category MALWARE, malware_family BlueShtorm_Stealer, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_09_12, reviewed_at 2024_09_12;)