Rule History

alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET SHELLCODE Possible Usage of Actionscript ByteArray writeByte Function to Build Shellcode"; flow:established,to_client; content:"writeByte(0x"; nocase; pcre:"/writeByte\x280x[a-z,0-9]{2}.+writeByte\x280x[a-z,0-9]{2}.+writeByte\x280x[a-z,0-9]{2}/smi"; reference:url,blog.fireeye.com/research/2009/07/actionscript_heap_spray.html; classtype:shellcode-detect; sid:2012120; rev:2; metadata:created_at 2010_12_30, confidence Medium, signature_severity Major, updated_at 2019_07_26;)