Tim Peck
@timpeckTrusted contributorCompletionist
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919 detections
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Detects the execution of the 'bun' JavaScript runtime invoking 'index.js' in the context of an npm package installation. This pattern is characteristic of the Shai-Hulud worm, which leverages the npm preinstall lifecycle hook to execute malicious code. The rule identifies suspicious process lineage where 'npm' spawns 'bun' for immediate payload execution, allowing for detection of the technique rather than specific artifacts.
Detects anomalous HTTP CONNECT proxy handshake requests and responses associated with Tengu malware. The rule monitors for 'HTTP/1.1 200 Connection Established' and 'HTTP/1.1 407 Proxy Auth Required' responses initiated from internal hosts, as well as outgoing HTTP CONNECT requests containing a 'Proxy-Authorization' header that match established Tengu bot proxy patterns.
Detects unauthorized attempts to disable or stop critical Windows Update services (wuauserv, UsoSvc, uhssvc, WaaSMedicSvc) via command line tools or service configuration changes. This behavior is indicative of defense evasion by malware such as Silver Fox/Gh0st RAT, aimed at preventing security updates or disabling security-related service monitoring.
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.
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