Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
508 detections
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Detects when a file is renamed to have the suffix ':payload' and the initiating process's file name is the same as the previous file name. This behavior can be indicative of Payload Ransomware to hide or modify files.
Detects coordinated activity characteristic of Akira ransomware, involving the inhibition of system recovery mechanisms (shadow copy deletion, backup catalog deletion, recovery policy modification) followed by high-volume file renaming (indicative of file encryption) across multiple host systems within a short timeframe.
Detects unauthorized or anomalous modifications to local vector database files by non-standard processes.
Detects the high-tempo Medusa ransomware encryption phase by identifying a large number of file renaming operations that append the '.medusa' extension within a short timeframe (1 minute). This rule specifically looks for more than 50 such rename events per device per minute.
Detects the creation or loading of specific DLL files identified as part of the Turla STOCKSTAY malware framework. The rule monitors both file system operations (creation, modification, renaming) and process image loads to identify indicators of this specific campaign.
Detects files or directories created beneath the PSEMHUB environment metadata transactions staging path, which could indicate data staging or server compromise. This rule specifically looks for file creation, modification, or renaming events within paths containing 'PSEMHUB.war' and '/envmetadata/transactions/' or '\envmetadata\transactions\'.
Detects high volumes of file operations (creation, rename, or modification) where files are given extensions typically associated with ransomware (e.g., .locked, .encrypted). The rule aggregates activity by process and endpoint and triggers an alert when the number of such operations exceeds a defined threshold, while excluding known legitimate backup and security software.
Detects file creation, copy, or rename operations within known VPN application directories (CyberGhost, ExpressVPN, NordVPN) when initiated by Chromium Embedded Framework (CEF) related processes (CefSharp.BrowsersSubprocess). This behavior is highly irregular as standard web browser components should not be modifying the local configuration or installation directories of VPN software.
Detects the opening of suspected APT28 (Fancy Bear) spearphishing lure documents by Microsoft Office or Outlook. The rule monitors for file access, creation, or renaming events where the filename matches known lure patterns associated with APT28 activities, such as naming conventions containing 'BULLETEN', 'OperInformativ', 'Courses', 'Consultation', 'Weapons', or 'Smuggling' in Word or Outlook processes.
Detects high-frequency file modifications or renames targeting file extensions commonly associated with ransomware. The rule monitors for a threshold of more than 20 file operations within a short timeframe by a specific process on an endpoint, indicating a potential mass encryption event.
Detects high-frequency file modifications or renames targeting file extensions commonly associated with ransomware. The rule monitors for a threshold of more than 20 file operations within a short timeframe by a specific process on an endpoint, indicating a potential mass encryption event.
Detects the creation of a web shell named 'help.php' within REDCap application directories, a known persistence mechanism used by UNC6508.
Detects a high number of office, PDF, text, and archive files created or renamed in the Downloads or AppData Roaming folders by a single process within a fifteen-minute window. The detection is triggered if either 25 or more files are created/renamed, or if the total size of these files exceeds 500 MB.
Detects rapid sequential file rename/write operations across multiple directories within a short window, which is a behavioral signature of active ransomware encryption activity. The rule specifically looks for more than 200 file operations (renamed or created) with a file extension matching a 4-8 character alphanumeric pattern, across more than 5 unique folders, all occurring within a 2-minute window and completing within 120 seconds.
Detects a shell script containing 'fanout' in its name, created or modified in common temporary directories like /tmp or /var/tmp, matching a reported propagation workflow. This activity is indicative of lateral movement attempts.
This rule detects the creation, modification, or renaming of the `authorized_keys` file within the `.ssh` directory by processes other than common SSH key management or shell utilities. This activity could indicate an adversary attempting to establish persistence or elevate privileges by adding their own public key for SSH access.
This rule detects a high volume of file rename events where the new file extension is not a commonly known good extension. This behavior is often associated with ransomware encrypting files and changing their extensions, or other forms of data destruction. The rule filters out common system directories to reduce false positives and aggregates events by process and device to identify the source of the suspicious activity.
This rule detects potential ransomware activity by monitoring for the creation, modification, or renaming of files with the '.prinzeugen' extension. This extension is commonly associated with specific ransomware families. The rule triggers if 10 or more such files are observed within a one-hour window on a single device, indicating a bulk encryption event.
This rule detects potential ransomware activity by monitoring for the creation, modification, or renaming of files with the '.prinzeugen' extension. This extension is commonly associated with specific ransomware families. The rule aggregates these file events by device and time, triggering an alert if 10 or more such files are observed within an hour on a single device, indicating a bulk encryption event.
Detects the creation, modification, or renaming of files with the '.prinzeugen' extension, which is commonly associated with ransomware activity. The rule aggregates these events by device and time, alerting if 10 or more such files are observed within an hour, indicating potential widespread encryption.
This rule detects potential ransomware activity by identifying rapid bulk file modifications or renames that result in files adopting extensions commonly associated with ransomware encryption. It looks for a high volume of file events (creation, modification, rename) within a short timeframe (1 hour) where the new file extensions match a predefined list of ransomware-specific extensions.
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