Darshan Thummar
@MightyCompletionist
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This rule detects large data transfers (over 65KB) to a remote host via SSH SCP (port 22) within the home network. It uses a thresholding mechanism to alert if 30 such transfers occur within a 60-second window from the same source.
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.
This rule detects direct SSH connections to cloud virtual machines (VMs) via a serial console interface. It specifically looks for HTTP traffic where the host header contains 'compute.googleapis.com' or 'cloudshell.googleapis.com' and the URI contains 'serialPort'. This indicates an attempt to establish an SSH session through the cloud provider's serial console service, which can be used for administrative access or lateral movement within a cloud environment.
This rule detects when a client makes repeated HTTP requests to the SharePoint download.aspx page, specifically looking for the URI pattern "/_layouts/download.aspx". This behavior, when occurring frequently from a single source, could indicate an attempt to enumerate and potentially exfiltrate content from a SharePoint site. The rule uses a threshold of 20 requests within 60 seconds from the same source IP to trigger an alert, suggesting a bulk download or enumeration activity.
This rule detects potential bulk email collection activity over IMAP. It triggers when a client makes 30 or more IMAP 'FETCH' commands containing 'BODY[]' (indicating a request for the full email body) to a server on port 143 within a 60-second window. This behavior can be indicative of an attacker or malicious insider exfiltrating a large number of emails from an IMAP server.
This rule detects attempts to copy the running configuration from a network device via SSH. It specifically looks for the string "show running-config" within TCP traffic destined for port 22 (SSH) on the home network. This activity is often associated with reconnaissance or data exfiltration by attackers or malicious insiders.
This rule detects attempts to establish a VNC (Virtual Network Computing) remote desktop session to a host on the protected network. It specifically looks for TCP traffic destined for port 5900 (the default VNC port) and the presence of the 'RFB 00' string within the initial bytes of the connection, which is characteristic of the VNC RFB (Remote Framebuffer) protocol handshake.
This rule detects attempts to exfiltrate wireless network lists (SSIDs) over HTTP POST requests. It specifically looks for HTTP POST requests with a body size greater than 200 bytes that contain the string "SSID" (case-insensitive). This activity is indicative of a trojan attempting to steal network information.
Docker Image Enumeration via API
Suricata
This rule detects attempts to enumerate Docker images via the Docker API. Specifically, it looks for HTTP requests to the '/images/json' endpoint on TCP port 2375, which is commonly used for unauthenticated Docker API access. This activity can indicate an adversary performing reconnaissance on a system to understand its Docker environment.
This rule detects the exfiltration of peripheral device information over HTTP POST requests. It specifically looks for HTTP POST requests with a body size greater than 200 bytes that contain the string "DeviceID" (case-insensitive). This pattern is indicative of malware or malicious scripts attempting to send device identifiers or other system information to a remote server.
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