ET MALWARE Possible DarkRats Tor Traffic

Query · suricata

flow:established,from_server;
tls.cert_issuer;
content:"CN=www"; startswith;
content:".com"; endswith;
pcre:"/^CN=www\.[0-9a-z]{8,20}\.com$/";
tls.cert_subject;
content:"CN=www"; startswith;
content:".net"; endswith;
pcre:"/^CN=www\.[0-9a-z]{8,20}\.net$/";
xbits:isset,ET.ipcheck,track ip_dst;
xbits:isset,ET.dropsite,track ip_dst;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET MALWARE Possible DarkRats Tor Traffic · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tls $EXTERNAL_NET any -> any any (
    msg:"ET MALWARE Possible DarkRats Tor Traffic";
    flow:established,from_server;
    tls.cert_issuer;
    content:"CN=www"; startswith;
    content:".com"; endswith;
    pcre:"/^CN=www\.[0-9a-z]{8,20}\.com$/";
    tls.cert_subject;
    content:"CN=www"; startswith;
    content:".net"; endswith;
    pcre:"/^CN=www\.[0-9a-z]{8,20}\.net$/";
    xbits:isset,ET.ipcheck,track ip_dst;
    xbits:isset,ET.dropsite,track ip_dst;
    classtype:trojan-activity;
    sid:2033387; rev:2;
    metadata:attack_target Client_Endpoint, created_at 2021_07_22, deployment Perimeter, performance_impact Significant, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_22, reviewed_at 2024_05_07;
)

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