Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects an unusually high number of downloads of files identified as 'octet-stream' or 'executable' from a single IP address within a one-hour window, based on W3CIISLog data. This behavior could indicate various malicious activities, including the distribution of malware, data exfiltration, or the use of a compromised web server for command and control.
This rule detects unusually large network uploads from devices. It identifies successful network connections where individual transfers exceed 100MB and aggregates these transfers by account name and hour. The rule then flags any account that has uploaded a total of 1TB or more within a single hour. This pattern could indicate data exfiltration, unauthorized data synchronization, or other malicious activities involving significant data transfer volumes.
Detects data exfiltration occurring over non-standard alternate network mediums
This rule detects potential command and control (C2) communication where data is hidden within image files using steganography. It specifically looks for HTTP responses (flow:to_client) containing JPEG image headers ('FF D8 FF') within the first 3 bytes, with a file size greater than 500,000 bytes. A threshold is applied to trigger an alert if 5 such events occur from the same destination within 60 seconds, indicating a potential high volume of large steganographic image transfers.
This rule detects when a file with the '.docm' extension is written to a network share via SMB. The presence of '.docm' suggests a macro-enabled Office document, which is often used in malicious campaigns. The rule specifically looks for the content '.docm' and a backslash character ('\') within the SMB traffic, indicating a file path or content related to a document.
This rule identifies potential data exfiltration or unusual data transfer activity by detecting a high volume of large data transfers (over 1MB per transfer) from or to an IIS web server. It aggregates these transfers hourly by client IP and alerts if 10 or more such transfers occur within that hour from a single IP.
Detects automated sustained outbound data transfers indicative of automated exfiltration
Detects large internal data transfers used for staging before exfiltration
Detects data exfiltration via generic web services or cloud platforms
This rule detects network traffic containing the strings "CreateProcessWithTokenW" and "MAXIMUM_ALLOWED" in HTTP client data. This combination of strings is indicative of a payload attempting a privilege escalation technique, specifically leveraging the Windows API function CreateProcessWithTokenW, often used in conjunction with token manipulation to achieve higher privileges. The `flow:to_client` indicates that the payload is being sent from the server to the client, suggesting a potential download or response containing the malicious code.
This rule detects HTTP POST requests to known paste sites (pastebin.com, paste.ee, hastebin.com) with a data size greater than 500 bytes. This behavior is often associated with adversaries using these sites to host malicious payloads or exfiltrate data.
Detects unusually large outbound network data transfers (over 1TB) from a single process account within an hour. This could indicate data exfiltration, unauthorized bulk data synchronization, or other malicious activity where large volumes of data are being moved out of the environment.
Detects unusually large outbound network data transfers (over 1TB) from a single process account within an hour. This could indicate data exfiltration, unauthorized bulk data synchronization, or other malicious activity where large volumes of data are being moved out of the environment.
This rule detects large encrypted data uploads (over 65KB) on TCP port 8443, which is an alternate port often used for TLS/HTTPS traffic. The rule triggers if 10 such uploads occur from the same source within 60 seconds, indicating a potential policy violation or data exfiltration attempt.
This rule detects potential data exfiltration over TLS to non-standard endpoints. It triggers when a large amount of data (greater than 65000 bytes) is sent from the home network to any destination IP on port 443 (HTTPS). A threshold is applied, triggering an alert if this occurs 20 times within 60 seconds from the same source IP, indicating a high volume of outbound encrypted traffic.
This rule detects potential data exfiltration attempts via Slack incoming webhooks. It triggers when an HTTP POST request is made to 'hooks.slack.com' with a URI containing '/services/' and a data size greater than 500 bytes. This pattern is indicative of an application or script sending data to a Slack channel using a webhook.
This rule detects obfuscated protocol data in non-standard command and control (C2) channels over TCP. It triggers when TCP traffic flows from the home network to any destination, is established, has a data size between 101 and 499 bytes, and occurs at a high frequency (30 times in 60 seconds from the same source). This pattern is indicative of trojan activity, specifically related to command and control communications.
This rule detects the exfiltration of a custom XOR-compressed archive over HTTP. It specifically looks for HTTP POST requests originating from the home network, containing file data, with a payload size greater than 10000 bytes, and a PCRE match for a sequence of at least 200 non-ASCII or control characters, which is indicative of XOR-compressed binary data.
This rule detects when a user downloads a large amount of Slack message history via the Slack API. It specifically looks for HTTP requests to 'slack.com' with the URI '/conversations.history' and triggers an alert if 20 such requests are observed from the same source IP within a 60-second window. This behavior could indicate an attempt to exfiltrate sensitive communication data.
This rule detects attempts to exfiltrate data to Google Drive cloud storage. It specifically looks for HTTP POST requests to 'www.googleapis.com' with the URI containing '/upload/drive/' and a data size greater than 10000 bytes. This pattern is indicative of a file upload operation to Google Drive.
This rule detects potential data exfiltration or unauthorized copying of data from USB drives via an SSH SCP session. It specifically looks for TCP traffic on port 22 (SSH) within the home network, where the data flow is from the client to the server (upload). The rule triggers if the content of the SCP session includes both "/media/" and "/usb" (case-insensitive), indicating paths commonly associated with mounted USB devices on Linux systems, and the data size is greater than 1000 bytes. This suggests that contents from a USB drive are being copied off the system over SSH.
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