Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects Kerberoasting activity on endpoints via the execution of Impacket's GetUserSPNs with request flags or hashcat executing Kerberos TGS cracking modes (13100/19700).
Detects outbound IPv4 and IPv6 connections from endpoints to public addresses on ports other than DNS (53), HTTP (80), HTTPS (443), 8000.
Command-and-control tools and tunnels often use uncommon ports to avoid web-focused filtering. Private, loopback, link-local, multicast and documentation ranges are excluded, and repeated connections are grouped by endpoint, process, remote IP and port. Custom apps and admin tools also use these ports, so triage by process, destination reputation and how rare the destination is.
Command-and-control tools and tunnels often use uncommon ports to avoid web-focused filtering. Private, loopback, link-local, multicast and documentation ranges are excluded, and repeated connections are grouped by endpoint, process, remote IP and port. Custom apps and admin tools also use these ports, so triage by process, destination reputation and how rare the destination is.
Sweeps endpoint telemetry for known IOCs from the trojanized anthropic.claude-code (Open-VSX v2.1.313) SSH backdoor: C2 IP 134.209.82.225, beacon URL, extension.js and tunnel key SHA-256 hashes, and ifconfig.me lookups from VS Code-family/extension-host processes. Results are summarized per device and IOC.
The following analytic detects PHP command-line interpreters executing code supplied directly on the command line with the CLI -r / --run options, or code supplied to PHPDBG through standard input.
It covers common CLI executable names on Linux and Windows, including php.exe, php-win.exe, the legacy php-cli.exe name, versioned Linux php binaries, phpdbg, and FrankenPHP's php-cli subcommand.
PHP-CGI and PHP-FPM are excluded because they do not support the PHP CLI inline -r option.
This behavior can be used legitimately for administration and automation, but unexpected or obfuscated inline PHP execution may indicate an attacker using an installed interpreter to run commands without dropping a script file.
It covers common CLI executable names on Linux and Windows, including php.exe, php-win.exe, the legacy php-cli.exe name, versioned Linux php binaries, phpdbg, and FrankenPHP's php-cli subcommand.
PHP-CGI and PHP-FPM are excluded because they do not support the PHP CLI inline -r option.
This behavior can be used legitimately for administration and automation, but unexpected or obfuscated inline PHP execution may indicate an attacker using an installed interpreter to run commands without dropping a script file.
The following analytic detects instances where Java, or Tomcat processes spawn a Linux shell, which may indicate exploitation attempts, such as those related to CVE-2021-44228 (Log4Shell).
This detection leverages Endpoint Detection and Response (EDR) telemetry, focusing on process names and parent-child process relationships.
This activity is significant as it can signify a compromised Java application, potentially leading to unauthorized shell access.
If confirmed malicious, attackers could execute arbitrary commands, escalate privileges, or maintain persistent access, posing a severe threat to the environment.
This detection leverages Endpoint Detection and Response (EDR) telemetry, focusing on process names and parent-child process relationships.
This activity is significant as it can signify a compromised Java application, potentially leading to unauthorized shell access.
If confirmed malicious, attackers could execute arbitrary commands, escalate privileges, or maintain persistent access, posing a severe threat to the environment.
Detects any file write event in a user's Downloads folder on Windows endpoints, covering every CrowdStrike Falcon Written event type.
Downloads is a common landing spot for payloads from phishing links and drive-by downloads. This is the broad version of the PE file rule and includes it, so it is very noisy and suits threat hunting or investigation pivots more than alerting. To triage, review the event type, file name, writing process, hash and company name.
Downloads is a common landing spot for payloads from phishing links and drive-by downloads. This is the broad version of the PE file rule and includes it, so it is very noisy and suits threat hunting or investigation pivots more than alerting. To triage, review the event type, file name, writing process, hash and company name.
Detects a VS Code-family editor or extension host process running 'git config --global user.email' and, within one minute from the same parent process, a curl public-IP lookup (ifconfig.me / api.ipify.org), the host-profiling step of the trojanized anthropic.claude-code loader.
Detects the presence of the compromised anthropic.claude-code VS Code extension version 2.1.313 or its associated bad hash on disk, reverse SSH tunneling spawned by code editors or extension hosts, and network connections to known malicious C2 IP address 134.209.82.225.
This analytic detects HTTP POST requests with a body of at least one megabyte that receive an HTTP 500 response.
Large failed uploads can indicate attempts to trigger resource exhaustion or exploit vulnerable request handling, including behavior associated with PHP2Shell, but require investigation with related web and application logs.
Large failed uploads can indicate attempts to trigger resource exhaustion or exploit vulnerable request handling, including behavior associated with PHP2Shell, but require investigation with related web and application logs.
Detects an Active Directory password spray attack originating from a single source IP, followed closely by a user account creation event (Event ID 4720) associated with a logon from that same source IP.
The following analytic identifies the execution of suspicious processes typically associated with WebShell activity on web servers.
It detects when processes like `cmd.exe`, `powershell.exe`, or `bash.exe` are spawned by web server processes such as `w3wp.exe` or `nginx.exe`.
This behavior is significant as it may indicate an adversary exploiting a web application vulnerability to install a WebShell, providing persistent access and command execution capabilities.
If confirmed malicious, this activity could allow attackers to maintain control over the compromised server, execute arbitrary commands, and potentially escalate privileges or exfiltrate sensitive data.
It detects when processes like `cmd.exe`, `powershell.exe`, or `bash.exe` are spawned by web server processes such as `w3wp.exe` or `nginx.exe`.
This behavior is significant as it may indicate an adversary exploiting a web application vulnerability to install a WebShell, providing persistent access and command execution capabilities.
If confirmed malicious, this activity could allow attackers to maintain control over the compromised server, execute arbitrary commands, and potentially escalate privileges or exfiltrate sensitive data.
Detects potential DLL sideloading where the legitimate Avira antivirus binary (avscan.exe) loads a custom DLL (avscan.dll) from user-writable directories such as AppData, Public, or ProgramData, potentially accompanied by a configuration file.
Detects Tor client execution on Windows endpoints, including the tor.exe binary and the Tor client bundled with Brave Browser (Private Window with Tor). Tor can hide command-and-control or exfiltration traffic, and some malware ships or drops a Tor client. To triage, check the parent process, image path, command line and SHA-256 hash, and confirm whether the user is authorized to use Tor.
Detects potential remote code execution, web shell activity, and post-exploitation behaviors originating from PHP worker processes on internet-facing hosts, referencing patterns associated with php2shell vulnerabilities. PHP-UP-2026
Detects persistence mechanisms installed by the trojanized Claude Code extension on Cursor or Node-based applications. On macOS, it detects the creation of LaunchAgent property list files. On Windows, it detects scheduled tasks created via schtasks.exe or event logs, and modifications to the Startup folder.
Detects executable files saved to user-writable profile folders (Desktop, Downloads, Documents and similar) on Windows endpoints when the file has no company name in its PE version information. Commercial software almost always carries this field, while malware, masqueraded tools and quick custom builds often do not. Detection relies on file signature rather than extension. Portable utilities and internal tools also match, so triage by hash, writing process, file path and download source.
Detects the execution of unauthorized Remote Monitoring and Management (RMM) tools shortly after either Microsoft Teams activity or a surge of inbound emails (email bombing) targeting the same user, a common precursor pattern used by threat actors for social engineering and initial access.
Detects potential web server remote code execution through suspicious child processes launched by PHP, FastCGI, Apache, and IIS workers. Identifies reverse shells, encoded commands, payload retrieval, reconnaissance, and temporary PHP execution.
Identifies devices running PHP versions affected by CVE-2026-109618 or CVE-2026-109619. The detection returns affected hosts, operating system platform, installed PHP version, and associated IPv4 addresses to support vulnerability assessment and remediation.
Detects and correlates installed PHP software packages and active PHP process execution across endpoints using device inventory, configuration data, and system logs to provide exposure visibility for PHP environments.
Detects inbound exploitation sources and outbound callback destinations associated with PHP2Shell infrastructure (CVE-2026-109618), correlating both directions per device while filtering out standard browser traffic.
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