alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE EarthWorm/Termite IoT Agent CnC Response"; dsize:<500; flow:established,from_server; content:"|00 00 00 01|"; offset:1; depth:4; content:"|00 00 00 01 6b 00 00 00 01|"; distance:7; within:9; fast_pattern; content:"agent"; distance:4; within:5; pcre:"/^\x00+?[\x20-\x7f]+?\x00+?$/R"; reference:url,github.com/anhilo/xiaogongju/tree/422136c014ba6b95ad3a746662be88372eb11b09; reference:url,www.alienvault.com/blogs/labs-research/internet-of-termites; classtype:command-and-control; sid:2027065; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Linux, attack_target Client_Endpoint, created_at 2019_03_07, deployment Perimeter, deprecation_reason Age, malware_family Termite, malware_family EarthWorm, performance_impact Moderate, confidence Medium, signature_severity Major, updated_at 2024_05_06, reviewed_at 2024_05_06;)