alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Drovorub tunnel Module Server Response"; flow:established,to_client; file_data; content:"|7b 22|children|22|"; startswith; content:"|22|name|22|"; content:"|22|module|22|"; content:"|22|dHVubmVs|22|"; distance:0; fast_pattern; content:"|22|name|22|"; content:"|22|action|22|"; reference:url,media.defense.gov/2020/Aug/13/2002476465/-1/-1/0/CSA_DROVORUB_RUSSIAN_GRU_MALWARE_AUG_2020.PDF; classtype:targeted-activity; sid:2030687; rev:2; metadata:affected_product Linux, attack_target Client_Endpoint, created_at 2020_08_13, deployment Perimeter, confidence High, signature_severity Major, updated_at 2020_08_13;)