Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule monitors build agent processes (e.g., Jenkins, Bamboo, Gradle, MSBuild) for suspicious DNS activity. It alerts when these processes resolve a high volume (3 or more) of unique external domains that are not associated with typical development, build, or dependency management platforms (e.g., Microsoft, Azure, GitHub, NPM, PyPI, Maven, Sonatype). This behavior may indicate an attempt by an adversary to reach command-and-control servers or exfiltrate data from a compromised build environment.
Detects instances where package managers like npm, pip, or python execute shells or scripting interpreters with command-line arguments indicative of software installation or build processes. This pattern is common in supply chain attacks where malicious packages run code during their installation phase.
Detects high frequency administrative modifications, such as user creation/deletion, password resets, or group membership changes, performed by service accounts associated with Azure AD Connect or Microsoft Entra Connect. This behavior may indicate account compromise where a service principal is being abused to perform bulk identity management operations.
Detects anomalous process spawning where VS Code or Amazon Q language server processes (e.g., node, amazonq-lsp) execute shell utilities (e.g., bash, curl) with arguments related to .amazonq/mcp.json or specific credential/exfiltration commands. This behavior is associated with the exploitation of the MCP server auto-execution vulnerability (CVE-2026-12957).
Detects unauthorized access and command execution associated with MSP service accounts. The rule triggers on successful SSH authentication using specific service account names (e.g., egnyteservice) followed by the execution of interactive shells under those same service account contexts, which is indicative of potential lateral movement or compromise in downstream environments.
Detects signs of the VerdantBamboo threat actor's BRICKSTORM/PLENET campaign, specifically targeting Linux-based edge appliances like pfSense and Synology NAS. The rule monitors for sudo abuse by specific service accounts (e.g., egnyteservice, www-data) attempting to leverage NOPASSWD sudo privileges for the 'tee' utility to write malicious content into sensitive system files (e.g., /usr/sbin/, /etc/cron.d/, /etc/sudoers). Additionally, it identifies unauthorized sudo enumeration commands that may indicate early-stage reconnaissance or persistence efforts.
Detects successful Microsoft 365 user authentications where Conditional Access (CA) policies were bypassed, resulting in single-factor authentication. This pattern is indicative of attackers using compromised edge network appliances—which are often configured as trusted network locations—to proxy authentication requests and circumvent security controls.
Detects SSH, SFTP, or SCP connections originating from internal edge appliances such as pfSense firewalls or Synology NAS devices directed at internal network hosts. This activity is consistent with VerdantBamboo BRICKSTORM lateral movement, where compromised edge infrastructure is leveraged as a pivot point to gain access to the internal network.
Detects suspicious child processes (such as PowerShell, CMD, or WScript) being spawned by Microsoft Office applications or email clients, which is indicative of exploitation activity consistent with Gamaredon spear-phishing campaigns. This specifically monitors for execution patterns attempting to deploy 'Ptero' family implants potentially following exploitation of vulnerabilities such as CVE-2025-8088.
This rule detects the execution of Quick Assist (quickassist.exe) or Microsoft Remote Assistance (msra.exe) in scenarios where the parent process, causality chain, or command line includes references to Microsoft Teams. This behavior is indicative of social engineering attempts where attackers impersonate IT support via Teams to induce users to launch remote access tools, a tactic observed in campaigns like BlackBasta.
Detects a sequence of events within a 30-minute window for a single user, specifically capturing MFA configuration changes (reset/enrollment), authentication, and device registration, occurring outside of typical business hours (20:00 - 06:00). This behavioral pattern is often indicative of an adversary establishing persistence or account takeover after gaining access to a valid account.
Detects unauthorized execution of native binaries initiated by npm during the package installation process. This rule targets the IronWorm supply-chain campaign, where compromised npm packages utilize preinstall hooks or node-gyp build processes to execute malicious binaries (often Rust-based) from unconventional paths within the package directory.
Detects unexpected child process creation spawned by npm or node.exe that is characteristic of the IronWorm Rust-based infostealer. This rule monitors for malicious npm preinstall or postinstall hooks executing common living-off-the-land binaries (like curl, powershell, or regsvr32) from within a node_modules directory structure, common in supply chain compromise scenarios.
Detects the use of the 'git commit --date' flag to manually set commit timestamps, a technique utilized by the IronWorm campaign to backdate malicious commits and manipulate repository history to appear benign or legacy-originating.
Detects suspicious git commit activity associated with the IronWorm campaign. The rule monitors for git operations involving backdated commits or force-pushes, particularly those using a specific noreply email address or common maintenance commit messages, which are indicative of supply-chain compromise and timestomping techniques within npm repositories.
Device Code Phishing Attempt
Cortex XDR
Detects attempts to abuse the device code flow targeting Microsoft Office and Authentication Broker applications from unmanaged, non-compliant devices with unbound tokens. This activity is indicative of a phishing attack where an adversary is trying to steal application access tokens.
Detects the execution of wscript.exe, msiexec.exe, or cmd.exe initiated with command lines pointing to script files (.js, .vbs) or shortcut files (.lnk) located on removable drives (d-z drive letters). This behavior is characteristic of the Raspberry Robin worm spreading via infected USB media.
Detects exploitation attempts against Langflow targeting unauthenticated API endpoints (/api/v1/build_public_tmp or /run) for remote code execution, as well as downstream process spawning activity on Linux hosts where Python processes execute shell commands (e.g., curl/wget piping to sh) to download known malicious dropper payloads.
This rule detects potential brute force attacks against Microsoft Exchange Outlook Web App (OWA) by monitoring for a high volume of 401 Unauthorized status codes from non-internal IP addresses. It also correlates these authentication events with subsequent post-authentication actions, specifically identifying mailbox logins followed by mailbox searching or export requests, which may indicate account compromise and unauthorized data collection or exfiltration.
Detects when a web browser (Chrome, Edge, Firefox, Brave, Opera) initiates a process that is not another instance of itself. This could indicate a drive-by download, execution of malicious code, or other suspicious activity originating from a browser.
This rule detects inbound emails that appear to be Microsoft Teams invitations but contain suspicious keywords in the subject line related to financial transactions (invoice, billing, payment, renewal, charge). This could indicate a phishing attempt where adversaries leverage legitimate-looking Microsoft invitation emails to deliver financially themed lures.
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