ET EXPLOIT Microsoft Exchange - InboxRules.svc Access Observed Following Successful ProxyToken Attack

Query · suricata

flow:established,to_server;
http.uri;
content:"/ecp/"; nocase;
content:"RulesEditor/InboxRules.svc/"; fast_pattern;
content:"?msExchEcpCanary=";
xbits:isset,ET.proxytoken.500,track ip_src,expire 30;

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 EXPLOIT Microsoft Exchange - InboxRules.svc Access Observed Following Successful ProxyToken Attack · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET EXPLOIT Microsoft Exchange - InboxRules.svc Access Observed Following Successful ProxyToken Attack";
    flow:established,to_server;
    http.uri;
    content:"/ecp/"; nocase;
    content:"RulesEditor/InboxRules.svc/"; fast_pattern;
    content:"?msExchEcpCanary=";
    xbits:isset,ET.proxytoken.500,track ip_src,expire 30;
    classtype:attempted-admin;
    sid:2033836; rev:1;
    metadata:attack_target Server, created_at 2021_08_30, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Exploit, updated_at 2021_08_30, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
)

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