alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Possible Injected JS Form Stealer Checking Page Contents M2"; flow:established,from_server; http.stat_code; content:"200"; file.data; content:"location.href.search|28|atob|28 27|Y"; pcre:"/^[2'][2h'+][2hl'+][2hlY'+][2hlY2'+][2hlY2t'+][2hlY2tv'+][2hlY2tvd'+][2hlY2tvdX'+][2hlY2tvdXQ'+](?:[2hlY2tvdXQ='+]){1,10}/R"; content:"|20|=|20|atob|28 27|aHR0cHM6L"; within:300; 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:2027816; 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;)