alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Possible Injected JS Form Stealer Checking Page Contents M1"; flow:established,from_server; http.stat_code; content:"200"; file.data; content:"var|20|_0x"; content:"|27 5c|x61|5c|x57|5c|x35|5c|x75|5c|x5a|5c|x58|5c|x4a|5c|x49|5c|x5a"; within:150; fast_pattern; reference:url,www.symantec.com/content/dam/symantec/docs/security-center/white-papers/istr-formjacking-deep-dive-en.pdf; classtype:trojan-activity; sid:2027815; rev:3; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2019_08_07, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Medium, signature_severity Major, tag CardSkimmer, updated_at 2020_11_18;)