alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Generic HeapSpray Construct"; flow:established,to_client; file_data; content:"CollectGarbage"; nocase; fast_pattern; content:"var"; pcre:"/^\s+?(?P<vname>[^\s\x3d]+)\s*?=\s*?(?:0x(?:(6[4-9a-f]|[7-9a-f])|\d{3,})|\d{3,}).+?[\s\x3b]for\s*?\([^\x3b\)]*?\x3b[^\x3b\)]+?<=?\s*?(?P=vname)[^\)]+?\)\s*?(?:\{[^}]*?|[^\r\n]*?)document\s*\.\s*createElement/Rsi"; classtype:bad-unknown; sid:2018145; rev:5; metadata:created_at 2014_02_15, confidence Medium, signature_severity Informational, updated_at 2019_10_08;)