Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win.Backdoor.Kolobko-9950676-0 Retrieving CnC Commands"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/bot/"; startswith; content:"?botid="; distance:3; within:9; fast_pattern; http.user_agent; content:"Mozilla|2f|5|2e|0|2028|Windows|20|NT|20|10|2e|0|3b20|Win64|3b20|x64|2920|AppleWebKit|2f|537|2e|36|2028|KHTML|2c20|like|20|Gecko|2920|Chrome|2f|99|2e|0|2e|4844|2e|51|20|Safari|2f|537|2e|36|20|Edg|2f|99|2e|0|2e|1150|2e|36|20|Trailer|2f|95|2e|3|2e|1132|2e|33"; reference:url,blog.talosintelligence.com/2022/08/recent-cyber-attack.html; classtype:command-and-control; sid:2038508; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_08_15, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_15;)