Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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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.
Detects behavior where a Node.js process spawns a command shell or interpreter (such as sh, bash, cmd.exe, or powershell.exe) executing suspicious commands indicative of remote code execution (RCE), reverse shells, or payload downloading, consistent with vulnerabilities like the Node.js decompression flaw CVE-2026-111497.
Detects Node.js processes spawning shells, script hosts or download tools, which is how post exploitation of a Node.js server would look after CVE-2026-111497 (Brotli decoder out of bounds write, fixed in 22.23.4, 24.22.1 and 26.12.1). Devices that Defender Vulnerability Management lists as vulnerable are flagged and sorted first, and rows are still returned when the CVE is not listed. It excludes npm, npx, yarn and pnpm processes and GitHub Actions runner action processes, which start shells for build scripts. It does not detect the memory corruption itself. The query ran without errors in a live tenant.
Detects Windows web/PHP worker processes (php.exe, php-cgi.exe,
apache.exe, httpd.exe, lsphp.exe, nginx.exe) spawning unexpected command shells
or download utilities. Exploitation of CVE-2026-109618 / CVE-2026-109619 in core
PHP grants unauthenticated RCE; the child process is the observable artifact since
the memory corruption leaves no trace in the PHP logs. mod_php deployments are
the highest-risk configuration.
apache.exe, httpd.exe, lsphp.exe, nginx.exe) spawning unexpected command shells
or download utilities. Exploitation of CVE-2026-109618 / CVE-2026-109619 in core
PHP grants unauthenticated RCE; the child process is the observable artifact since
the memory corruption leaves no trace in the PHP logs. mod_php deployments are
the highest-risk configuration.
Detects a Node.js web server process initiating a child process that is a known command shell or download utility, which is indicative of post-exploitation activity such as remote code execution.
Identifies Node.js processes that spawn potentially suspicious child processes, including operating system shells, command interpreters, scripting runtimes, and download utilities. This behaviour may indicate exploitation of a Node.js application resulting in arbitrary command execution, followed by payload retrieval or additional post-exploitation activity.
Detects web server worker processes (php-fpm, apache2, httpd, nginx) or PHP interpreters spawning shell or reconnaissance utilities (sh, bash, curl, wget, id, whoami), consistent with post-exploitation activity such as PHP2Shell remote code execution.
Detects exploitation of the PHP2Shell RCE vulnerabilities in core PHP
(CVE-2026-109618 out-of-memory corruption and CVE-2026-109619 stale global state),
which allow unauthenticated remote code execution delivered through malicious
multipart uploads. Successful exploitation causes the PHP-FPM/Apache/httpd/lsphp
worker, typically running as www-data, to spawn a system shell (sh, bash, cmd,
powershell) or a download utility (curl, wget) to retrieve a second-stage payload.
A web server process spawning an interactive shell is a high-fidelity indicator of
web application compromise and should be investigated immediately.
(CVE-2026-109618 out-of-memory corruption and CVE-2026-109619 stale global state),
which allow unauthenticated remote code execution delivered through malicious
multipart uploads. Successful exploitation causes the PHP-FPM/Apache/httpd/lsphp
worker, typically running as www-data, to spawn a system shell (sh, bash, cmd,
powershell) or a download utility (curl, wget) to retrieve a second-stage payload.
A web server process spawning an interactive shell is a high-fidelity indicator of
web application compromise and should be investigated immediately.
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.
Detects web server worker processes or PHP interpreters spawning suspicious child processes associated with reverse shells, network sockets, or reconnaissance commands.
Detects the Tensorlake npm compromise (tensorlake@0.5.144, Shai-Hulud) through the two payload hashes, gh-token-monitor persistence, node or bun running lib/setup.mjs or Math_Symbol.js and node or bun connections to iseekaigogo.com or public Ethereum RPC hosts. It needs Defender for Endpoint events from developer machines and does not see lockfile or package cache contents. The query ran without errors in a live tenant
Detects the correlation of a file creation event in the user Temp folder (such as t.vbs) originating from browser cache or download patterns, followed shortly by the execution of the script via wscript.exe or cscript.exe.
Detects malicious file hashes, suspicious process executions involving Node.js/Bun running setup scripts, schtasks/powershell persistence monitoring tasks, and connections to known domains/RPC endpoints associated with threat activity. The query ran without errors in a live tenant.
Detects post-exploitation activity where a Node.js or Bun runtime process spawns a shell, interpreter, or network download utility, which could indicate exploitation such as CVE-2026-111497 (Node2Shell).
Detects post-exploitation behavior where a Node.js process spawns a shell, interpreter, or utility (such as sh, bash, nc, curl, python), which may indicate Remote Code Execution (RCE) via vulnerabilities like CVE-2026-111497 in the Node.js Brotli decoder.
Detects execution of a Python proof-of-concept script targeting CVE-2026-111497 that launches node child processes or runs related commands involving Brotli compression files and decompression functions.
Detects PHP SAPI processes accessing /proc/self/mem (or equivalent memory mapping) and subsequently spawning a Unix shell, which is characteristic of web shell activity or exploitation of PHP memory corruption/injection vulnerabilities like zif_system.
Detects post-exploitation activity following PHP2Shell RCE vulnerabilities on Linux, where a web server or PHP worker process or web server user creates cron persistence, modifies SSH authorized_keys, or launches reverse shell one-liners.
Detects instances where web server processes or PHP interpreters (apache2, httpd, php-fpm, php) spawn a shell process (sh, bash, dash). This behavior is often indicative of post-exploitation activity such as remote code execution (RCE) via PHP session upload progress or web shell activity.
Detects web server worker processes (such as PHP-FPM, Apache httpd, etc.) launching shells, interpreters, or download/network tools, which is a common post-exploitation pattern following remote code execution (RCE) vulnerabilities.
Detects a Node.js or Bun process spawning a shell or common download utility on Linux, indicating potential post-exploitation activity such as remote code execution (e.g., CVE-2026-111497).
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