alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Downbot/Shady Rat Remote Shell Connection"; flow:established,from_server; dsize:<90; content:"|2F 2A 0A 40 2A 2A 2A 40 2A 40 40 40 40 40 40 40 40 40 40 40|"; depth:20; flowbits:set,et.shadyratinit; reference:url,www.symantec.com/connect/blogs/truth-behind-shady-rat; classtype:trojan-activity; sid:2013379; rev:3; metadata:created_at 2011_08_09, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)