Arnold Chan
@slazTrusted contributorCompletionist
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7,555 detections
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Detects successful VPN logins following a burst of failed attempts from multiple IP addresses, where the successful login originates from a known malicious IP or an IP associated with the preceding failed attempts. This rule specifically identifies potential credential stuffing or password spraying activity targeting VPN services, often associated with the BlackSuit ransomware group.
Detects the creation of PHP files within the 'wp-content/uploads/elementor/forms/' directory of a WordPress installation. This behavior is highly suspicious as it often indicates an attempt by an attacker to deploy a web shell or other malicious script following successful exploitation of the Elementor plugin, which allows for arbitrary file uploads.
Detects anomalous, high-volume unauthenticated POST requests to the Elementor Pro 'admin-ajax.php' endpoint with the 'elementor_pro_forms_send_form' action. This behavior is indicative of potential exploitation attempts or reconnaissance associated with the Elementor Pro file upload vulnerability (CVE-2026-32475).
Detects the presence of the 'Mushr00w' PHP web shell, typically associated with exploitation of vulnerabilities in WordPress plugins such as Super Forms or Elementor Pro. The rule looks for identifying strings within the file, including specific filenames, HTML title tags, and common PHP file upload function signatures used by this shell.
This rule detects attempts to exploit a vulnerability in the WordPress Super Forms plugin (CVE-2026-14894). The rule monitors for malicious file upload requests containing embedded PHP code or attempts to bypass filename extensions for PHP files via the super_submit_form AJAX action.
Detects incoming HTTP POST requests targeting the 'admin-ajax.php' endpoint with parameters associated with a malicious file upload exploit against Elementor Pro (CVE-2026-32475). The rule specifically looks for the 'elementor_pro_forms_send_form' action and the presence of PHP file extensions within form fields, indicating an attempt to upload a web shell.
Detects inbound network traffic originating from IP addresses known to be associated with an exploit campaign targeting the Super Forms plugin (CVE-2026-14894). The rule acts as an indicator of compromise (IoC) match for potential exploitation attempts directed at internal network infrastructure.
Detects Direct Send spearphishing impersonating internal roles (IT/Finance/Procurement) with business-themed lures targeting leadership/finance titles. Rewritten: removed a non-functional sender/recipient substring check and a broken EmailPostDeliveryEvents join that made the rule rarely fire; anchored detection to the actual Direct Send signature (null envelope + domain match) and a direct IdentityInfo join; standardized auth-failure parsing to match the other rules in this set.
Detects the RejectDirectSend bypass (null SMTP envelope sender + internal-domain spoof). Tightened to require Microsoft's composite auth verdict OR all of SPF/DKIM/DMARC failing (vs. any one), excludes known-approved Direct Send relay IPs, and excludes likely-legitimate bulk/newsletter traffic via BulkComplaintLevel.
Detects anomalous, non-interactive sign-in activity in Microsoft 365 that suggests session cookie replay (Pass-the-Cookie). The rule correlates successful, MFA-validated interactive sign-ins against subsequent, non-interactive sign-ins that lack MFA, occur from a different device and IP address within a short time window, and bypass standard interactive re-authentication.
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