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Explore public detection logic contributed by the community across SIEM and rule languages.
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This detection flags a parent and child process pair on internet-facing Windows servers, where the parent is a web server process and the child is the process it launched. The web server processes covered are w3wp, httpd, nginx and Tomcat, including versioned Tomcat service executables such as tomcat9.exe and Tomcat running under java.exe, which is identified by the Catalina bootstrap class in its command line. A server is treated as internet-facing based on the most recent status recorded for it.
Instead of matching known web shell names, the query builds a baseline from the previous 30 days of process activity on each device and alerts when a pair appears in the latest window that has never been seen on that device before, so it can catch web shell activity it has never seen before. Because the baseline is held per device, a pair that is normal on one server does not hide the same pair appearing on another.
The rule runs every 24 hours, as this is the only Defender custom detection frequency with a 30-day lookback, and the alert window covers the last 25 hours so that a slightly delayed run does not leave a gap.
The baseline and alert windows are separated by ingestion time rather than event time, so events that arrive late are still evaluated.
Instead of matching known web shell names, the query builds a baseline from the previous 30 days of process activity on each device and alerts when a pair appears in the latest window that has never been seen on that device before, so it can catch web shell activity it has never seen before. Because the baseline is held per device, a pair that is normal on one server does not hide the same pair appearing on another.
The rule runs every 24 hours, as this is the only Defender custom detection frequency with a 30-day lookback, and the alert window covers the last 25 hours so that a slightly delayed run does not leave a gap.
The baseline and alert windows are separated by ingestion time rather than event time, so events that arrive late are still evaluated.
Detects script execution (such as wscript, cscript, mshta) spawned from a shell parent process (like explorer.exe or cmd.exe) referencing browser cache files (matching f_* in browser profile directories) or copying scripts to the local Temp directory as t.vbs.
Detects shell or interpreter processes spawned as children of the
PAN-OS management web service. Exploitation of CVE-2026-0322 (authenticated RCE,
CWE-94) in the management interface results in the web server process forking
unexpected /bin/sh, curl, wget or scripting interpreter children to run
post-exploitation commands on the management plane.
PAN-OS management web service. Exploitation of CVE-2026-0322 (authenticated RCE,
CWE-94) in the management interface results in the web server process forking
unexpected /bin/sh, curl, wget or scripting interpreter children to run
post-exploitation commands on the management plane.
Detects potential defense evasion activity where Windows Defender configurations are modified or disabled, followed closely within 20 minutes by a silent, quiet, or unattended software uninstallation initiated by a script interpreter or command processor on the same device.
Detects Tailscale serve commands setting up a TCP forward to a Unix socket (such as tailscaled.sock), correlated with recent file creation, modification, or renaming events involving the socket file by a non-standard process within a 1-hour window.
Detects the execution of Wireshark or tshark with command-line arguments indicating TLS key logging or packet capture file handling, followed shortly by a crash handler process (WerFault.exe or WerFaultSecure.exe) for the same process.
Detects the execution of tools and commands commonly used to enumerate Group Policy Objects (GPOs) within an environment, such as gpresult.exe with specific flags, PowerShell scripts querying GPO modules, or ldifde.exe checking group policy containers.
Detects potential bootkit activity or unauthorized modifications to the EFI system partition by correlating non-standard .efi file writes with subsequent execution of boot configuration utilities like bcdedit or mountvol within a 30-minute window.
Detects web server processes (such as nginx, apache2, httpd, uwsgi, gunicorn, php-fpm) spawning command-line utilities typically used for system and user discovery (such as id, whoami, groups, hostname, uname, netstat, ps, etc.), which often indicates web application exploitation and remote code execution.
Detects a sequence where a FortiSIEM-related process writes or modifies a shell script in a cron or phoenix directory, followed closely within 2 minutes by a child process spawned by cron executing that same written script file.
Detects web servers (httpd, apache2, nginx, php-fpm) or Request Tracker (RT) Perl worker processes spawning suspicious child processes such as shells, downloaders, netcat, or Python interpreters, indicative of post-exploitation or web application compromise.
Detects Python interpreter activity accessing multiple credential store categories (such as password managers, Discord, SSH keys, or Steam) in a short window on a single device, or specific stealer scripts associated with known file paths.
Detects potential Linux privilege escalation and persistence activities by monitoring for the creation of persistence scripts in post_boot.d, modifications to the sudoers.template file appending NOPASSWD, or system configuration rebuilds shortly after sudoers template changes.
Detects PowerShell processes spawned via shortcut files (lnk) using suspicious command-line parameters that subsequently create both a text file and a Discord-named executable on the same device within a 10-minute window.
Detects execution of Node.js and NPM related commands involving potential supply chain indicators, script execution, or download utilities (such as curl, wget, powershell, or eval) within command lines.
Detects msiexec.exe spawning scripting or programming engines (such as PowerShell or Python) that perform LDAP directory searches and establish outbound external network connections within a specific time window.
Detects msiexec.exe spawning scripting or programming engines (such as PowerShell or Python) that perform LDAP directory searches and establish outbound external network connections within a specific time window.
IOC sweep (SHA256, domains, URLs, IPs, sender emails) for the RedFlick-style VHDX/LNK/WebDAV campaign against Moldovan and Ukrainian civil society, with false-positive controls.
Detects hosts with the trojanized version 3.0.123 of the Rank Math PRO WordPress plugin distributed in October 2026. It correlates software inventory, file events, command-line process events, and network connections to identify affected packages, installation activity, and C2 communications.
Detects PowerShell launched hidden and non-interactive with an insecure execution policy and Base64 decode-and-execute, or a script combining Base64 decode-and-execute with browser history collection and WMI shadow copy enumeration, as seen in the Midnight Blizzard (GTG-20006) stager.
Detects potential Linux privilege escalation and persistence activities by monitoring for the creation of persistence scripts in post_boot.d, modifications to the sudoers.template file appending NOPASSWD, or system configuration rebuilds shortly after sudoers template changes.
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