Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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IDS Classtypes
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Detects when a shell process (such as sh, bash, dash, cmd.exe, or powershell.exe) is spawned by a metrics, logging, or authentication management service shortly after the service accepts an inbound network connection, potentially approximating exploitation of an internal management service.
Detects the Tensorlake npm 0.5.144 compromise (Shai-Hulud worm via preinstall). Includes a baseline query to identify the affected package/version across Defender inventory, file, network, device and process events, plus preinstall download/obfuscated-exec behaviour. Results are summarized per device/account.
Detects the execution of fsquirt.exe spawned by INISAFECrossWebEXSvc.exe where fsquirt.exe subsequently loads an unsigned or untrusted DLL, indicative of a potential TechHub DLL side-loading technique.
Detects the execution of known Remote Monitoring and Management (RMM) tools within a 30-minute window following Microsoft Teams network activity on the same device, which can be an indicator of unauthorized remote access or interactive command and control setup via remote support applications.
Detects the execution of PaperCut reverse SOCKS5 bridge kit operator-side scripts (such as admin_bridge.py, live_reverse_socks5.py, start_socks.sh) or the creation of related Java bridge class artifacts.
Detects malicious behaviors involving the Chisel tunneling tool, including reverse SOCKS proxy connections with TLS verification skipped, cron-based persistence referencing watchdog scripts in hidden /var/tmp directories, and associated tool staging activities.
Correlates Microsoft Teams process activity with the subsequent launch of a remote monitoring and management (RMM) tool on the same device within 30 minutes, potentially indicating social engineering or hands-on-keyboard access following external communications.
MSI-backed loader execution chain
Cortex XDR
This query uses the process ID of each child to match the parent process's PID, then reconstructs the chain back to explorer.exe. It also checks for the encoded PowerShell, silent MSI installation, and embedded MSI execution behaviours described in the source article.
Important caveats
- Causality scope: This finds matching process events within a shared causality ID; it does not establish that each process directly launched the next.
- Explorer root: The root process may not share the same causality ID in every telemetry scenario. If this join removes otherwise valid results, investigate the root separately.
- Strict matching: Requiring every stage will miss partial chains and variants with different command-line arguments. Consider separate alerts for the encoded PowerShell and silent MSI behaviours.
- Validation: Confirm the field names, join syntax, and causality-ID population against your tenant before deploying this as a production detection.
Important caveats
- Causality scope: This finds matching process events within a shared causality ID; it does not establish that each process directly launched the next.
- Explorer root: The root process may not share the same causality ID in every telemetry scenario. If this join removes otherwise valid results, investigate the root separately.
- Strict matching: Requiring every stage will miss partial chains and variants with different command-line arguments. Consider separate alerts for the encoded PowerShell and silent MSI behaviours.
- Validation: Confirm the field names, join syntax, and causality-ID population against your tenant before deploying this as a production detection.
Detects browser cache smuggling (ClickFix/FileFix delivery mechanisms) where a non-browser script interpreter or LOLBin accesses a browser HTTP-cache directory and writes an executable or script payload outside the cache, followed shortly by the execution of a payload from a user staging directory.
Detects web server processes (apache2, httpd) spawning a Unix shell (sh, dash, bash) which subsequently executes curl, wget, or php to perform an external HTTP fetch or download. This behavior is commonly associated with PHP or web application post-exploitation callbacks (webshells).
Detects when AI coding agent processes (such as Claude, Cursor, Copilot, Windsurf, Codeium, or Aider) spawn command shells or download utilities with command lines indicative of downloading and executing external payloads.
Detects command execution patterns on NetScaler appliances involving the extraction of system details (id, uname, hostname, nsrelease) and writing or echoing them into HTML files within NetScaler web directories, indicative of web shell installation or staging.
Detects ABNotify.exe, running from the standard AOMEI Backupper installation path,
spawning any executable located in the html\ rendering hierarchy. This directory is
intended for rendering assets, not executables; a child process launched from here
indicates a hijacked upgrade workflow triggered through the AOMEI notification agent
with no user interaction.
spawning any executable located in the html\ rendering hierarchy. This directory is
intended for rendering assets, not executables; a child process launched from here
indicates a hijacked upgrade workflow triggered through the AOMEI notification agent
with no user interaction.
Detects cmd.exe launched from the Windows Run dialog (explorer.exe
parent) downloading a payload with a living-off-the-land transfer utility such as
certutil, bitsadmin or curl. ClickFix pasted commands frequently chain cmd.exe with
these built-in binaries to fetch the secondary malware stage.
parent) downloading a payload with a living-off-the-land transfer utility such as
certutil, bitsadmin or curl. ClickFix pasted commands frequently chain cmd.exe with
these built-in binaries to fetch the secondary malware stage.
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.
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.
Detects the setting of the TS_SERVE_ALLOW_ALL_INTERFACES environment variable or registry key combined with the execution of Tailscale serve or funnel commands on the same device within a 24-hour window, potentially indicating unauthorized exposure of local services.
Detects Trays.exe started with the -tray argument from a Trays subfolder or a batch script, as observed in the RareWolf BAT dropper ahead of a silent AnyDesk installation.
Detects the archiving of the ProgramData AnyDesk directory using WinRAR/RAR with header encryption or the PowerShell Compress-Archive function, which indicates configuration staging for potential exfiltration.
Detects potential C2Agent parent-spoofing behavior characterized by short-lived scheduled tasks (created and deleted within a 10-minute window with names matching c2a_<n>) or process relaunches carrying specific -fork2 command-line markers.
Detects credential harvesting tooling and activity targeting PaperCut configuration and log files by identifying specific parser script executions, searches for PaperCut credential key patterns in process command lines, and the creation of related harvest artifacts.
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