ET MALWARE MirrorBlast CnC Activity M2

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"=bmFtZT"; fast_pattern;
pcre:"/(?:JmJ1aWxkP|YnVpbGQ9|ZidWlsZD)/R";
http.user_agent;
content:"REBOL"; startswith;
Raw source ET MALWARE MirrorBlast CnC Activity M2 · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE MirrorBlast CnC Activity M2";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"=bmFtZT"; fast_pattern;
    pcre:"/(?:JmJ1aWxkP|YnVpbGQ9|ZidWlsZD)/R";
    http.user_agent;
    content:"REBOL"; startswith;
    reference:url,twitter.com/ffforward/status/1441137165329649664;
    reference:md5,6b59a4657eb90d92590f5a183d9d1e77;
    classtype:command-and-control;
    sid:2034022; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_09_24, deployment Perimeter, malware_family MirrorBlast, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_24;
)

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