Arnold Chan
@slazTrusted contributorCompletionist
2 followers2,100 downloads4,384 copies51 likes26,169 views
7,555 detections
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This rule detects potentially malicious command-line activity involving powershell.exe or mshta.exe that is initiated by a web browser process (chrome.exe, msedge.exe, firefox.exe, or iexplore.exe). It monitors for indicators such as encoded commands, usage of Invoke-Expression, download cradles, hidden window flags, and specific known IOCs, correlating these events with recent browser activity to identify potential drive-by download or browser-based exploitation attempts.
KQL Query from file: clickfix-mshtapowershell-run-dialog-exec-with-download-cradle-after-captcha-lu.kql
This rule detects network connections or DNS queries to known phishing domains (typosquatted Microsoft login domains), DeadDrop Resolver domains, and suspicious HTML payloads served from common CDN/package hosting sites (e.g., unpkg.com, npmmirror.com, cdn.jsdelivr.net, yarnpkg.com). These patterns are indicative of initial access attempts via phishing or the secondary stage of malware C2 communication.
Detects instances where common web server processes (e.g., PHP, Apache, Nginx) spawn child processes associated with command-line utilities (e.g., curl, bash, python). The rule specifically monitors for command-line arguments referencing log files or traces, which is indicative of potential exploitation attempts or post-exploitation activities such as log poisoning or remote code execution.
Detects the presence of the 'X_TRACE_' marker within Magento report files or system logs, which is characteristic of the StyleSmuggler threat actor's method of poisoning log files to facilitate subsequent code execution.
Detects invocations of the 'grafana_api_request' tool that lack a preceding valid bearer-token authentication event for the same session. This indicates a potential scenario where a server or service account token is being used on behalf of an unauthenticated caller, bypassing normal authentication requirements for the Grafana API.
Detects anomalous outbound network connections from the Grafana MCP (Model Context Protocol) server process to internal private IP address ranges. The rule compares current network activity against a 14-day baseline to filter out known data sources, identifying potentially unauthorized lateral movement or internal network probing via server-side request forgery (SSRF) vulnerabilities.
KQL Query from file: grafana-mcp-server-mediated-probing-of-internal-ip-ranges-lateral-movement.kql
This rule detects the use of the LockAppHost process to execute suspicious commands associated with tampering with security configurations, including Windows Defender settings, service management (sc.exe), and task scheduling. Adversaries may abuse this process to bypass security controls, disable real-time monitoring, or maintain persistence.
This rule detects instances where LockAppHost.exe or a variation of it (likely used as a proxy) initiates processes or command-line arguments that interact with Windows services, scheduled tasks, or Windows Defender configurations. This behavior is indicative of an adversary attempting to disable security features, suppress Windows updates, or manipulate system services to evade detection.
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