Tim Peck
@timpeckTrusted contributorCompletionist
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916 detections
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This rule detects potential attempts to tamper with Microsoft Defender security settings by creating or managing scheduled tasks that modify Defender exclusion paths. It correlates process execution (specifically schtasks.exe or PowerShell commands used for setting exclusions) with Windows Registry events that modify the Microsoft Defender exclusion path registry keys, flagging suspicious activity within a 15-minute window.
Detects anomalous child process execution originating from PaperCut application processes (pc-app.exe) or associated Java processes. This is indicative of post-exploitation activity following an RCE vulnerability where the application server is leveraged to spawn command interpreters, discovery utilities, or ingress tools.
Detects unauthenticated HTTP POST requests to the PaperCut web management interface that attempt to modify server configuration settings. This behavior is consistent with exploitation attempts targeting vulnerabilities like CVE-2026-81578, which may allow for unauthorized pre-authentication remote code execution.
Detects node.js or bun runtime processes accessing known sensitive cloud, CI, and package manager credential files on disk. This behavior is indicative of malicious npm supply chain attacks (e.g., Mini Shai-Hulud) attempting to exfiltrate secrets stored in standard configuration paths.
Detects exploitation attempts against the WordPress LiteSpeed Cache plugin (CVE-2024-28000), including suspicious web requests involving ESI/crawler cookie hash manipulation, execution of known exploit binaries (wp28000, wp28000_cp), and subsequent unauthorized creation of administrator accounts via the WordPress REST API.
Detects suspicious PowerShell execution spawned by common development tools or shell environments like node, npm, or WSL. The rule evaluates the process lineage and scores the command line arguments for characteristics commonly used by malicious payloads, such as hidden execution, bypass flags, network download activity, or temporary file access, which are indicative of software supply chain attacks or automated malicious script execution.
Detects successful authentication to Microsoft Teams or Slack where MFA was successfully completed, but the device is reported as unmanaged or non-compliant and is accompanied by sign-in risk signals. This behavior is consistent with Adversary-in-the-Middle (AitM) proxy attacks where an attacker captures credentials and session tokens, bypassing MFA, and using the hijacked session from an unrecognized device or location.
Detects the use of the sc.exe utility to disable critical system, security, and database services, a technique commonly associated with Everest ransomware to prevent service restart during encryption activities.
Detects Microsoft Edge being launched in a headless state with remote debugging enabled, hidden window dimensions, and a specific temporary user data directory naming convention. This pattern is characteristic of the TWINLOOT technique, where an adversary controls a headless browser via the Chrome DevTools Protocol (CDP) to conduct C2 communications and data exfiltration through legitimate Microsoft Graph API endpoints, effectively blending malicious traffic with normal browser activity.
This rule identifies Windows Server devices, specifically potential Domain Controllers, that are flagged as vulnerable to CVE-2026-27912 (ResetNightmare) and CVE-2026-25177 (KerberLoss). It checks for the absence of the March/April 2026 cumulative updates that address critical Kerberos Change Password and Service Principal Name (SPN) logic flaws.
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