alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"REMOTE [PTsecurity] Slam v.2.0 ping-pong"; flow:established, to_server; dsize:8<>17; content:"PONG#"; startswith; content:"#"; endswith; flowbits:isset, slam_ping; flowbits:unset, slam_ping; threshold:type limit, track by_dst, count 2, seconds 240; reference:url, https://tria.ge/240915-bxx6asydpm/behavioral1; reference:url, rules.ptsecurity.com; classtype:trojan-activity; sid:10012077; rev:1;)