alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/AGENT.NXNX checkin"; flow:established,to_server; content:"|24 5d 3b 30 2e 29 23 28 30 34 3b 14 1e 14 13 02 0a 54 55 59|"; reference:url,ahnlabasec.tistory.com/1007; classtype:command-and-control; sid:2019964; rev:1; metadata:created_at 2014_12_18, confidence High, signature_severity Major, updated_at 2019_07_26;)