alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Java/QRat Receiving Command 1"; flow:established,from_server; dsize:16; content:"|00 0d|giveClientMac"; offset:1; fast_pattern; classtype:trojan-activity; sid:2021504; rev:1; metadata:created_at 2015_07_22, malware_family QRat, signature_severity Major, updated_at 2019_07_26;)