ET MALWARE Observed Suspicious SSL Cert (Acme Co)

alert tls $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Observed Suspicious SSL Cert (Acme Co)";
    flow:established,to_client;
    tls.cert_subject;
    content:"O=Acme Co"; bsize:9; fast_pattern;
    tls.cert_issuer;
    content:"O=Acme Co"; bsize:9;
    threshold:type limit, count 1, seconds 60, track by_src;
    reference:url,github.com/DeimosC2;
    classtype:domain-c2;
    sid:2037960; rev:8;
    metadata:attack_target Client_and_Server, created_at 2021_09_20, deployment Perimeter, former_category HUNTING, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_07_04, reviewed_at 2024_12_02, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
)