alert tcp $HOME_NET any -> any any (msg:"ET ATTACK_RESPONSE Possible MS CMD Shell opened on local system"; flow:established; dsize:<110; content:"Microsoft Windows "; depth:20; content:"Copyright 1985-20"; distance:0; content:"Microsoft Corp"; distance:0; content:"|0a 0a|"; distance:0; classtype:successful-admin; sid:2008953; rev:9; metadata:created_at 2010_07_30, confidence Medium, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)