alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET WORM W32/Njw0rm CnC Beacon"; flow:established,to_server; content:"lv0njxq80"; depth:9; content:"njxq80"; distance:0; reference:url,www.fireeye.com/blog/technical/malware-research/2013/08/njw0rm-brother-from-the-same-mother.html; reference:md5,4c60493b14c666c56db163203e819272; reference:md5,b0e1d20accd9a2ed29cdacb803e4a89d; classtype:command-and-control; sid:2017404; rev:3; metadata:attack_target Client_Endpoint, created_at 2013_08_31, deployment Perimeter, signature_severity Major, tag c2, updated_at 2019_07_26, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)