Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects suspicious user account creation activity or direct modification of the /etc/passwd file. The rule flags the use of 'useradd' or 'adduser' commands, as well as unauthorized attempts to inject root users into the passwd file, specifically looking for indicators like 'troot' (a common misconfiguration or backdoor username pattern).
Detects the use of the Windows certutil.exe utility for potentially suspicious file operations, including downloading files from remote URLs via 'urlcache' or 'split', or encoding/decoding files. This is a common Living-off-the-Land (LotL) technique used by attackers to stage malicious payloads or deobfuscate malicious content.
This rule detects malicious activity associated with Kimsuky JSE loaders, which leverage XML DOM manipulation (e.g., bin.base64) and ADODB.Stream components to decode and drop base64-encoded payloads into the ProgramData directory. It further monitors for subsequent decoding attempts using certutil and the presence of specific, suspicious file extensions (e.g., .a9oc, .lpXD, .lpxQ) often used by this threat actor.
Detects a suspicious sequence of events attributed to APT37, where a HWP or HWPX decoy file is written to user-accessible staging directories (Downloads, Temp, Desktop, Public) followed by the execution of a .lnk file using cmd.exe or explorer.exe within 30 seconds on the same device.
This rule detects the creation of files or directories associated with known suspicious or malicious browser extension IDs within the Microsoft Edge User Data folder. It monitors for the writing of new executables, scripts, or directory creation events that match specific, potentially malicious extension GUIDs.
Detects the silent activation of the 'Smart Window' feature in Mozilla Firefox. The rule monitors for a two-stage sequence where Firefox modifies its 'prefs.js' configuration file to enable the feature, followed shortly by a network connection to the local Smart Window AI API on localhost port 8765.
Detects attempts to perform a container escape using path traversal via the 'docker cp' command. This rule monitors for malicious directory traversal sequences, the creation of specific artifacts used in known PoC exploits for container escapes, and the subsequent execution of scripts or shell interpreters by container management processes.
Detects unauthorized modifications to SSH authorized_keys files and changes to SSH configuration (specifically PermitRootLogin) on Cisco SD-WAN controllers, which may indicate persistence or unauthorized remote access attempts.
Detects indicators of exploitation attempts for the libssh2 pre-auth heap RCE vulnerability (CVE-2026-55200). The rule monitors for the execution of known harness binaries, abnormal child processes spawned by sshd, unauthorized file creation in sensitive temporary directories, and the loading of libssh2 libraries from non-standard, writable locations.
This rule identifies suspicious command-line activity indicative of log manipulation, truncation, or deletion on Cisco SD-WAN controllers. It monitors for the execution of utilities like 'rm', 'shred', 'truncate', 'bash', 'cat', and 'echo' targeting critical system logs, including '/var/log/auth.log' and various 'vdebug' log files. By detecting these anti-forensic techniques, the rule flags potential attempts by adversaries to conceal post-exploitation activity or clear audit trails.
This rule detects attempts to install custom Certificate Authority (CA) certificates on Linux systems using common utilities. Adversaries may install root certificates to subvert trust controls, allowing them to intercept encrypted traffic or sign malicious code without triggering security warnings. The rule specifically looks for these utilities being used to interact with common CA certificate directories, while excluding a placeholder for legitimate custom CA installations depending on your environment.
Detects file creation or write operations involving file paths containing the string 'SysMain_5874288'. This pattern is often associated with adversary attempts to drop, stage, or modify files using names designed to masquerade as legitimate system components or services, potentially to maintain persistence or evade detection.
This rule monitors Cisco Unified Communications Manager (UCM) environments for multiple stages of an attack chain, including potential Server-Side Request Forgery (SSRF) attempts against administrative interfaces, suspicious file modifications by service accounts, indicators of privilege escalation, and anomalous outbound network connections from core Cisco processes.
Detects instances where the legitimate Windows utility 'Fondue.exe' (Features on Demand) loads the control panel library 'APPWIZ.cpl' from non-standard locations such as C:\Users\Public or AppData directories. It also identifies the staging phase where 'APPWIZ.cpl' is written to 'C:\Users\Public', which is indicative of a DLL side-loading attack sequence, often associated with the Elephant malware dropper.
This rule detects suspicious activity related to GitHub Actions workflows, including the creation or modification of workflow configuration files, the placement of suspicious JavaScript files in the repository's .github directory, the execution of the 'Bun' runtime within an Actions runner environment, and cloud-based events indicating workflow modification containing 'Run Copilot' strings. These patterns are often associated with CI/CD pipeline compromise, malicious automation, or unauthorized code execution within build environments.
Detects file creation or modification events within the Windows Credential Vault folder (AppData\Local\Microsoft\Vault), excluding legitimate activity by the 'vaultsvc.exe' process. This could indicate an attempt to access, modify, or exfiltrate stored credentials.
Detects execution of the 'fsutil' command with 'setZeroData' parameters in conjunction with a ping to 127.0.0.2. This pattern is commonly associated with malicious activities involving data manipulation or potential preparation for disk-level operations, as 'fsutil setZeroData' can be used to set a range of a file to zeros.
Detects attempts to perform a container escape using the 'docker cp' command, where a maliciously crafted source path with traversal sequences allows the container daemon to write files outside of the container boundary. The rule monitors for suspicious 'docker cp' command executions and the creation of artifacts associated with known path traversal escape techniques in the host filesystem by the Docker daemon.
This rule monitors for the presence of known exploit harness binaries associated with CVE-2026-55200 on disk or in command lines, and identifies post-exploitation activity where common network utilities (curl, git, php) execute unsigned or suspicious child processes, which often indicates lateral movement or payload staging.
Detects potentially unauthorized or suspicious usage of the RustDesk remote access tool. The rule monitors for connections from new peer IDs, the spawning of command shells (cmd.exe or powershell.exe) by the RustDesk process, and the writing of executable or sensitive file types by RustDesk to non-standard directories.
This rule detects various persistence mechanisms and configuration tampering techniques often associated with compromised development environments. Specifically, it monitors for the creation of LD_PRELOAD libraries in common directories, unauthorized modifications to shell profile scripts, suspicious cron job creation by Node/NPM processes, and the poisoning of configuration files for IDEs and AI coding assistants (e.g., Claude, Cursor, VSCode). It also detects the execution of suspicious Node.js scripts used as session hooks.
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