Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects network communication from 'rnpkeys.exe' to external IP addresses. This behavior is indicative of the Sauron Loader malware, which utilizes a side-loaded 'rnpkeys.exe' binary to establish beaconing and C2 communication as part of its registration process.
Detects a potential vishing or technical support scam scenario by identifying a burst of email traffic to a user (email bombing) followed within one hour by the execution of a remote assistance tool (Quick Assist, Microsoft Remote Assistance, or AnyDesk) on the same user's endpoint.
This rule detects the loading of known-vulnerable or malicious kernel drivers (BYOVD) followed by the termination of major EDR or security-related processes on the same host within a 10-minute window. This behavior is indicative of an adversary attempting to disable security controls to evade detection after achieving kernel-level privileges.
Detects instances where a process named 'updater.exe' launches another process also named 'updater.exe'. This behavior is often associated with malware or malicious loaders (such as LegionLoader) that use secondary instances to facilitate malicious code execution or persistence while masquerading as legitimate update utilities.
Detects anomalous behavioral patterns where an AI agent process (e.g., Claude Code, Cursor, Aider) performs multi-category discovery of its own runtime environment, plugins, and host configuration. The rule identifies agents that trigger processes spanning at least three distinct discovery categories (Network, File/Plugin, Software, or System) within a short timeframe, indicating potential reconnaissance of agent-authorized capabilities and tools rather than standard host exploration. Covers T1082, T1518, T1083, T1016
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.
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 the execution of the Windows Workspaces Broker process (wkspbroker.exe) when it loads a library (DLL) from a path within the RemoteApp Gateway directory under LOCALAPPDATA. This behavior is associated with DLL side-loading techniques used to execute malicious payloads such as the Xray-core implant.
Detects a suspicious pattern where a single process loads high-risk cryptography and system-level modules (e.g., sqlite3, win32crypt, win32api) followed within 30 minutes by credential harvesting actions such as dumping Wi-Fi keys using 'netsh' or establishing persistence via 'schtasks'. This behavior is indicative of a 'lazy-import' stealer or malicious loader attempting to evade simple signature-based detection.
TokenGrabber Builder: Nuitka/PyInstaller AV-Evasion Compilation - detects Python builder scripts compiling an embedded stealer.py payload into a native executable via Nuitka or PyInstaller with AV-evasion flags
This rule monitors for a variety of indicators associated with malicious activity, including connections to known malicious IP addresses, the presence of specific malicious file hashes or filenames, modifications to Windows system policies (specifically Legal Notice configuration), and changes to Active Directory Group Policy Objects using specified GUIDs.
Detects modifications to the creation time of web-accessible script files (.aspx, .php, .asp, .jsp) located in common web directories (wwwroot, inetpub). Adversaries often use timestomping to hide the creation of backdoored web shells, making them appear older and potentially bypassing forensic or integrity-checking mechanisms.
Detects the execution of a malicious Electron-based installer masquerading as Anthropic's Claude AI (ClaudeOpus5-desktop.exe). The rule monitors for the specific filename or known malicious hashes, as well as the spawning of an embedded malicious loader process associated with the RevStealer infection chain.
Detects the use of native Windows utilities (vssadmin, wmic, wbadmin, bcdedit) to delete volume shadow copies, clear backup catalogs, or disable system recovery features, which is a common behavior of ransomware before encrypting files.
Detects persistence mechanisms used by The Gentlemen ransomware, specifically the creation of malicious scheduled tasks (UpdateUser, UpdateSystem, or gentlemen_system) and modification of registry Run keys (GupdateS or GupdateU). The rule also monitors for the presence of the operator password string 'G7Vz9eyG' within command line arguments.
Detects the creation of hidden administrative shares (ending in $) mapped to local directories (e.g., C:\Temp) with unrestricted 'Everyone' or 'ANONYMOUS LOGON' permissions. This technique is used by the Gentlemen ransomware to stage malicious binaries for lateral movement and subsequent encryption across the network. The rule monitors for 'net share' commands with specific permission grants, 'icacls' operations modifying access for anonymous users, and registry changes to 'NullSessionShares' configurations.
Detects the execution of Nova ransomware (formerly RALord) by monitoring for its specific modular command-line interface arguments, which include file encryption commands, ransom note deployment, and specific ransom note filenames. The rule monitors process creation events for strings like 'encrypt-all', 'encrypt-path', 'readme-add', '--workers', and the presence of the 'README_NOVA.me' ransom note or unique file extensions associated with its encryption activity.
Detects potential malicious activity where a process associated with a Claude agent (or a downloader utility) references a 'SKILL.md' configuration file. This behavior is indicative of a poisoned skill file being used to trigger unauthorized payload downloads or re-establish persistence.
Detects persistence establishment for the NetSupport Manager remote access tool (client32.exe) via common Windows techniques including registry run keys, Winlogon configuration, service creation, and scheduled tasks. This activity is often associated with the abuse of legitimate RMM software as a covert remote access implant, frequently following initial access via PowerShell or script-based loaders.
Detects anomalous behavioral patterns where an AI agent process (e.g., Claude Code, Cursor, Aider) performs multi-category discovery of its own runtime environment, plugins, and host configuration. The rule identifies agents that trigger processes spanning at least three distinct discovery categories (Network, File/Plugin, Software, or System) within a short timeframe, indicating potential reconnaissance of agent-authorized capabilities and tools rather than standard host exploration. Covers T1082, T1518, T1083, T1016
Detects rapid, multi-category system and network enumeration performed by AI-assisted development tools (e.g., Cursor, Claude, ChatGPT). The rule triggers when an AI agent process performs a comprehensive scan of the host environment, specifically covering machine/OS identity, network configuration, process listings, installed software, and access to sensitive credential files within a 10-minute window. It requires at least 5 distinct discovery categories and 6 total events to reduce noise from routine debugging. Covers T1082, T1016, T1057, T1518
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