alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Red Leaves magic packet response detected (APT10 implant)"; flowbits:isset,ncc.apt10.beacon_send; flow:established,to_client; dsize:12; content:"|7a 8d 9b dc|"; offset:4; depth:4; threshold:type limit, track by_dst, count 1, seconds 600; reference:url,github.com/nccgroup/Cyber-Defence/blob/master/Technical%20Notes/Red%20Leaves/Red%20Leaves%20technical%20note%20v1.0.pdf; reference:url,blog.jpcert.or.jp/2017/04/redleaves---malware-based-on-open-source-rat.html; classtype:targeted-activity; sid:2024174; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_04_04, deployment Perimeter, malware_family RedLeaves, malware_family Red_Leaves, performance_impact Low, confidence High, signature_severity Major, tag APT, tag APT10, tag RedLeaves, updated_at 2019_07_26;)