Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects the staging of the Lucid Stealer hidden self-copy loader and the SQLite CLI helper binary in the Temp directory. This rule specifically looks for file creation events in the user's Temp directory with filenames matching patterns associated with Lucid Stealer's staging activities: 'winupd_*.exe' for its self-copy loader and '_sq3e_*.exe' for its SQLite helper.
Detects suspicious attempts to dump serialized GitHub Actions secrets (JSON) into a text file named 'format-results.txt' for subsequent artifact exfiltration, a technique used by IronWorm. The rule looks for shell commands that use 'echo' to write to 'format-results.txt' and contain references to 'VARIABLE_STORE' or 'secrets', indicating an attempt to exfiltrate sensitive CI/CD environment variables.
Detects PowerShell script execution utilizing WMI event subscription (Register-WmiEvent) explicitly targeting the creation of logical disks with DriveType 2 (USB drives). This technique is known to be used by the GammaSteel threat group to monitor and potentially steal data from physical media.
Detects the initiation of a FileSystemWatcher object in PowerShell configured to monitor the 'Changed' event. This technique is used by GammaSteel to actively monitor user operations in real time and steal documents the moment they are modified.
Detects the initiation of a FileSystemWatcher object in PowerShell configured to monitor the 'Changed' event. This technique is used by GammaSteel for real-time document surveillance to steal files the moment they are modified.
This rule detects large HTTP POST requests containing GZIP compressed data (identified by the magic bytes '|1F 8B|') with a size greater than 100,000 bytes. This behavior is indicative of possible data staging or exfiltration, where an attacker might compress and upload sensitive data from a compromised system.
Confluence Wiki Bulk Export
Suricata
This rule detects HTTP requests to the '/spaces/exportspace.action' URI, which is associated with bulk export functionality in Confluence Wiki. This activity could indicate an attempt to exfiltrate data from a Confluence instance.
This rule detects a high volume of document downloads from SharePoint, specifically looking for repeated access to the `/_layouts/download.aspx` URI. A threshold of 30 downloads within 60 seconds from a single source IP address triggers the alert. This behavior could indicate an attempt to exfiltrate a large amount of data from SharePoint.
This rule detects a high volume of IMAP/SSL connections to port 993 from a single source IP address within a short timeframe, which could indicate an attempt to collect emails in bulk, potentially associated with MITRE ATT&CK technique T1114 (Email Collection). The threshold is set to 30 connections within 60 seconds from the same source.
This rule detects the delivery of a payload containing the strings "SpAcceptCredentials" and "hook" within HTTP response body data. This pattern is indicative of an SSPI credential hooking attempt, where an attacker tries to intercept or steal credentials by injecting malicious code into the Security Support Provider Interface (SSPI) process. The detection is focused on traffic flowing from the server to the client.
This rule detects the presence of an API hooking payload within HTTP response data, specifically looking for the strings "SetWindowsHookEx" and "WH_KEYBOARD" (case-insensitive). This combination suggests an attempt to intercept keyboard input, which is a common technique used by malware for credential interception.
This rule detects potential keylogger data exfiltration over HTTP POST requests. It specifically looks for HTTP POST requests where the URI contains the string 'keys' (case-insensitive) and the data size is greater than 200 bytes. This combination suggests that a keylogger might be sending captured keystrokes or other sensitive data to a remote server.
This rule detects ARP cache poisoning attempts by identifying multiple ARP responses (opcode 2) for the same IP address within a short time frame (15 responses in 5 seconds from the same source). This behavior is indicative of an attacker attempting to redirect network traffic by sending forged ARP replies.
Detects access or creation of files within Google Drive that have credential-related names, indicating potential credential harvesting attempts or unauthorized access to sensitive data. The rule specifically looks for file events such as 'view', 'edit', 'create', or 'access_url' on files whose titles contain keywords commonly associated with credentials (e.g., password, secret, key, token, etc.).
Detects network requests associated with FallSpy, an Android spyware utilized by the Russia-nexus threat group GREYVIBE. FallSpy is deployed via fake persona lures and spoofed applications to harvest critical intelligence. While the original YARA rule targets file-based artifacts (e.g., class names like DataCollectorWork), this Sigma rule adapts the logic to focus on the highly reliable exfiltration URL parameters observable in proxy and web gateway logs.
An adversary may compress or encrypt data that is collected prior to exfiltration using 3rd party utilities
Detects PowerShell script execution utilizing WMI event subscription (Register-WmiEvent) explicitly targeting the creation of logical disks with DriveType 2 (USB drives), a technique GammaSteel uses to steal data from physical media.
Detects the creation, modification, or renaming of 'btasc.cfg', a configuration file specifically associated with the JFMBackdoor malware. This file is used to store encrypted configuration data necessary for the backdoor's operation.
Detects the creation or modification of Exchange inbox rules used by Kali365 designed to suppress security alerts by moving, deleting, or marking as read emails containing specific keywords. This technique is often used by adversaries to hide their activities or prevent detection.
Detects a hidden PowerShell process dynamically loading the Windows Forms assembly to inject base64-encoded keystrokes into foreground applications. This behavior is associated with the SStar Agent RAT's remote 'type' functionality.
Detects a hidden PowerShell process dynamically loading the Windows Forms assembly to inject base64-encoded keystrokes into foreground applications. This technique is used by the SStar Agent RAT for its remote 'type' functionality.
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