Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects artifacts related to the ValleyRAT malware family, specifically identifying markers such as 'Phantom Persistence Module', 'RegisterApplicationRestart', and specific 'RSL_' strings within process command lines, image paths, or module loads using Windows Event Logs and Sysmon data.
This rule detects modifications to Nginx configuration files (nginx.conf, or files within conf.d, sites-enabled, or sites-available directories) by processes other than authorized system management tools (e.g., nginx, apt, ansible). It further correlates these file modifications with subsequent Nginx configuration reloads, which is a common behavior when an adversary attempts to apply malicious configuration changes to a web server.
This rule monitors for signs of Atlas RAT activity on Linux systems, including the execution of processes matching known Atlas RAT naming conventions, unauthorized modifications to system persistence mechanisms (systemd or init.d directories) by non-package management utilities, and anomalous outbound network connections originating from sshd or PAM-related processes.
This rule detects potential persistence mechanisms on Linux systems by identifying the creation of new systemd service files, modifications to init.d scripts, or the use of systemctl to enable or start services. The rule specifically excludes standard package management activities (apt, yum, dnf, dpkg) and flags if the triggered service operation involves suspicious file paths.
This rule monitors for modifications to critical Name Service Switch (NSS) configuration files (/etc/nsswitch.conf) or the creation/loading of NSS shared library files (/lib/libnss_*.so). Adversaries may target these files to manipulate identity management, gain persistence, or escalate privileges by intercepting authentication requests.
Detects the deployment and execution of GS-Netcat (gsocket), a tool often used for creating persistent reverse shells or backdoors. The rule identifies processes associated with gsocket, instances where the 'uptime' command is masqueraded with suspicious command-line arguments, and unauthorized creation or modification of systemd service files designed for persistence.
Detects Linux processes running from non-standard directories that exhibit network beaconing behavior, correlated with the concurrent creation or modification of systemd unit files on the same host. This pattern is indicative of a remote access trojan (RAT) or backdoor establishing persistent command-and-control.
Detects the suspicious execution of fltMC.exe or the loading of FLTLIB.dll from temporary directories, which is a known behavior of JFMBackdoor malware. It also detects known SHA256 hashes associated with this threat.
Detects network connection attempts or successes from critical Windows processes (System, svchost.exe, lsass.exe) targeting the localhost interface (127.0.0.1 or ::1) on non-standard ports (above 1024, excluding SMB ports 445/139). This behavior is often indicative of local process injection, credential dumping activity, or unauthorized inter-process communication used by malware to bypass network security controls.
Detects JFMBackdoor activity where a sideloaded fltMC.exe executable located in a temporary directory initiates process enumeration using tasklist.exe or performs service lifecycle management operations (delete, start, stop, create, or query) using the sc.exe utility.
This rule detects scenarios where an application located in Program Files or Program Files (x86) loads an unsigned DLL from its own installation directory. It further correlates this activity by checking if the DLL was recently created (within 48 hours) to identify potentially suspicious new files, which may indicate DLL hijacking or side-loading attempts.
Detects attempts to modify or delete Conditional Access Policies in Microsoft Graph. Adversaries may attempt to alter or remove Conditional Access Policies to bypass security controls and gain unauthorized access or persistence.
Detects execution of fltMC.exe from a location other than the standard Windows System32 directory, correlated with recent file creation or modification events in sensitive directories like ProgramData or User Public folders. This behavior is indicative of an attacker attempting to load malicious kernel-mode drivers or perform system-level operations using a renamed or moved system utility.
Detects potential token manipulation attacks using SMB loopback connections. The rule identifies processes executing with privileges commonly associated with token impersonation (SeImpersonatePrivilege, SeAssignPrimaryTokenPrivilege) or running as SYSTEM that are not expected system processes, correlated with an SMB network connection to the local loopback address on port 445.
Detects the loading of an unsigned DLL by 'quick_share.exe', 'NearbyShare.exe', or 'nearby_sharing.exe' from suspicious directory paths such as User Temp, AppData, or Downloads folders. This behavior is highly indicative of DLL side-loading attempts where an adversary leverages a legitimate, known process to execute malicious code.
Detects the creation or modification of a registry run key that uses a name similar to '.NET Runtime Optimization Service' and points to a suspicious location within 'C:\ProgramData\'. This technique is often used by adversaries to establish persistence on a system by masquerading as legitimate software.
Detects HTTP response bodies containing common PE/Shellcode magic headers (MZ, PE, or NOP sleds) which are associated with the delivery of payloads designed to exploit or utilize the Windows KernelCallbackTable for process injection. The detection focuses on suspicious content delivered over HTTP connections.
Detects cross-process activity where an unsigned executable residing in common user-writable directories (AppData, Temp, ProgramData) attempts to interact with or inject into sensitive system processes (explorer.exe, svchost.exe, notepad.exe). This behavior is characteristic of malicious process injection attempts.
Detects the execution of the PsExec service (PSEXESVC) or command-line usage indicating remote service execution, including the standard PsExec '-accepteula' flag combined with network path indicators. Additionally detects the creation of the PSEXESVC service registry key, which is indicative of PsExec-based lateral movement or remote administration.
Detects Add-AppxPackage -Register against a manifest on a UNC path. Legitimate loose-file registration during development points at local paths; a UNC InstalledLocation is the core of UNCanny - it hands the SYSTEM Windows Store InstallService a LoadLibraryW on an attacker-controlled UNC via plugin resolution.
Detects post-exploitation activities on SD-WAN appliances, including unauthorized tenant list uploads related to CVE-2026-20245, creation of unauthorized 'troot' accounts in sensitive system files, staging of system files, unauthorized permission modifications via chmod/chown, and privilege escalation attempts using su.
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