alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Bladabindi/njrat CnC Checkin"; flow:established,to_server; content:"lv"; depth:2; content:"[endof]"; isdataat:!2,relative; dsize:>0; reference:url,threatgeek.com/2013/07/njrat-detection-rules-using-yara-.html; classtype:command-and-control; sid:2017419; rev:3; metadata:created_at 2013_09_05, confidence Medium, signature_severity Major, updated_at 2024_03_06;)