Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects the use of PowerShell or Windows Script Host to access files within common web browser cache directories combined with indicators of Base64 decoding and pixel data manipulation. This behavior is indicative of extracting malicious payloads hidden via steganography within browser-cached image files, a technique often used in phishing campaigns to evade detection.
This rule detects the 'ClickFix' social engineering technique where a user is manipulated into manually invoking the Windows Run dialog (Win+R) and pasting a malicious command. The rule monitors for instances where explorer.exe spawns command interpreters like cmd.exe, powershell.exe, or mshta.exe with suspicious command-line patterns indicative of encoded payloads, script execution, or remote downloads.
Detects anomalous remote access patterns on a single endpoint, specifically involving AnyDesk or TeamViewer sessions originating from multiple distinct geographical locations combined with usage by multiple distinct user accounts. This pattern is consistent with DPRK IT worker fraud (Wagemole) involving shared laptop farms.
Detects the execution of conhost.exe with the --headless flag, which is commonly observed in Kimsuky LNK-based malware campaigns to execute encoded cmd.exe payloads. This pattern involves the use of certutil or echo commands to deobfuscate and execute embedded scripts, often leveraging hidden windows or process hollowing techniques for persistence and evasion.
Detects the creation of a Windows scheduled task where the task name contains the string 'keyroll', often associated with credential rotation or suspicious persistence mechanisms.
Detects execution of 'rnpkeys.exe' and associated DLLs ('rnp.dll' or 'tdwp.dll') located within the '\ProgramData\keyroll\' directory, which is a common persistence or staging location for malicious activity.
Detects the execution of known remote access and support tools (Quick Assist, Microsoft Remote Assistance, or AnyDesk) on a host that has recently received a high volume of emails (over 50). This behavior often aligns with social engineering campaigns where a user is instructed to download or launch a remote support tool under false pretenses.
Detects the execution of attrib.exe spawned by known Sauron Loader process names (rnpkeys.exe, rnp.exe, or tdwp.exe). The rule flags instances where attrib.exe is executed without its typical command-line arguments (file attribute flags), suggesting it is being used as a surrogate process for injected C2-tasked shellcode.
Detects invisible/non-printing Unicode codepoints (zero-width chars, bidi overrides, variation selectors, Unicode tag characters, and Private Use Area icon-font codepoints) embedded in process command lines - covering both classic command/script obfuscation and the emerging use of hidden codepoints to smuggle AI prompt-injection payloads into content later processed by AI copilots/agents. Tightened to require 2+ high-confidence codepoint hits (or 1 from a known scripting host/LOLBin), and gates Private-Use-Area-only matches (a common legitimate icon-font false-positive source) to scripting hosts with 5+ hits, maps to T1027.018.
Detects AI agent tooling (e.g., Copilot, Cursor, Ollama) that makes outbound network calls to known AI model providers followed by the execution of suspicious shell commands within a short duration. The rule flags high-severity activities such as download-cradles, credential reconnaissance, LOLBin usage, and persistence mechanisms. Informational alerts are generated for standard CLI activity within the same timeframe.
Detects MayaBot's scheduled-task persistence chain by correlating two signals on the same device within a 60-minute window: (1) schtasks.exe creating a daily task referencing a hidden batch script (update.bat/backup.bat/firewall-update.bat) under AppData\Local, spawned from wscript.exe/cscript.exe/cmd.exe, and (2) cmd.exe launching a hidden-window PowerShell process referencing the same batch scripts under AppData\Local. Requiring both signals together, anchored to the AppData\Local path, sharply reduces false positives compared to alerting on either behavior alone.
Detects the execution of known NTLM Certificate Enrollment Service (CES) relay tools alongside subsequent outbound network connections to Active Directory Certificate Services (AD CS) CES enrollment endpoints. This behavioral pattern indicates an adversary attempting to relay NTLM authentication to an AD CS server to request a certificate, typically for privilege escalation or persistence.
Detects Kerberos TGT requests (AS-REQ, Event ID 4768) where authentication is performed using a certificate (PKINIT) instead of a password. This pattern is commonly associated with Pass-the-Certificate attacks, often utilized by tools like Certipy following certificate enrollment or relaying to obtain a TGT as part of a credential access chain.
This rule detects potential NTLM relay or authentication downgrade attempts by monitoring HTTP POST requests to the Certificate Enrollment Service (CES) endpoint. It specifically flags when an 'Authorization' header contains an NTLM-wrapped 'Negotiate' token, which is often indicative of an attacker attempting to coerce or relay authentication material to the service.
Detects Kerberos TGT requests (AS-REQ, Event ID 4768) where authentication is performed using a certificate (PKINIT) instead of a password. This pattern is commonly associated with Pass-the-Certificate attacks, often utilized by tools like Certipy following certificate enrollment or relaying to obtain a TGT as part of a credential access chain.
Detects the execution of known NTLM Certificate Enrollment Service (CES) relay tools alongside subsequent outbound network connections to Active Directory Certificate Services (AD CS) CES enrollment endpoints. This behavioral pattern indicates an adversary attempting to relay NTLM authentication to an AD CS server to request a certificate, typically for privilege escalation or persistence.
Detects instances where a browser or agentic-browser process initiates a file download and subsequently executes that same file within a five-minute window, without the intervention of a user-driven process like explorer.exe. This pattern is indicative of automated 'agentic' browser activity, potentially signifying hijacked web instructions or malicious automated tool execution flows.
Detects a two-stage pattern indicative of command-and-control (C2) communication. The rule identifies an initial request to a 'relays.json' endpoint (relay discovery) followed by a request to an 'api.php' endpoint (dispatcher decision) within a 5-second window, both using a 13-digit timestamp query string for cache-busting. It also captures single-stage 'api.php' requests as lower confidence alerts.
This rule monitors network, file, and process telemetry for matches against a predefined list of malicious IP addresses, domain names, and file hashes. It flags suspicious network connections to known C2 infrastructure and the presence or execution of known malicious files based on SHA256 and SHA1 indicators.
Detects instances where PowerShell scripts are executed via the Windows Task Scheduler from within potential staging directories (ProgramData with randomized folder names). The rule identifies execution that uses common PowerShell obfuscation flags (e.g., -EncodedCommand) and requires secondary hardening bypass flags (e.g., -WindowStyle hidden), followed by correlated network activity to a specific suspicious C2 domain.
This rule correlates multiple telemetry sources (File Events, Certificate Info, Network Events, and DNS Events) to detect known malicious indicators, including specific file hashes, IP addresses, domains, and URLs associated with malicious activity.
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