alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE NewBot Loader CnC Checkin"; flow:established,to_server; pcre:"/^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{2}/"; content:"|04 00 00 00|"; offset:24; content:"|00 00 02 00 00 00 24|"; fast_pattern; distance:2; within:9; pcre:"/^[a-f0-9]{8}-([a-f0-9]{4}-){3}[a-f0-9]{12}/R"; content:"|18|Microsoft|20|Windows|20|"; within:150; byte_jump:2,28,little,from_beginning,post_offset 31; isdataat:!2,relative; reference:url,medium.com/walmartglobaltech/newbot-loader-81e2ba11c793; reference:md5,c3197c9638728736a0d0247a9cdc14c5; classtype:trojan-activity; sid:2051665; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_03_14, deployment Perimeter, malware_family NewBot_Loader, performance_impact Moderate, confidence High, signature_severity Major, tag NewBot_Loader, updated_at 2024_03_14; target:src_ip;)