ET MALWARE APT29 Implant8 - MAL_REFERER

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE APT29 Implant8 - MAL_REFERER";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.header;
    content:"&bvm=bv.81"; fast_pattern;
    content:"|2c|d."; distance:6; within:3;
    content:"|0d 0a|"; distance:3; within:2;
    content:"Referer|3a 20|https|3a|//www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=";
    pcre:"/^(?:[02-9]|1[01]?)&ved=0C[A-L]{2}QFjA[A-L]&url=/R";
    content:"&ei="; distance:0;
    pcre:"/^[A-Za-z0-9]{20,22}&usg=[A-Za-z0-9_]{34}&bvm=bv\.81[1-7]{6}\,d\.[A-Za-z0-9_]{3}\r\n/R";
    http.header_names;
    content:!"Cookie|0d 0a|";
    reference:url,www.us-cert.gov/security-publications/GRIZZLY-STEPPE-Russian-Malicious-Cyber-Activity;
    classtype:targeted-activity;
    sid:2024004; rev:4;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_02_17, deployment Perimeter, malware_family APT29_Implant8, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_11_12;
)