Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
12 detections
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Detects the specific TCP handshake pattern characteristic of the Fast Reverse Proxy (FRP) client (frpc) initiating a connection to a command-and-control server. The rule inspects established traffic for specific metadata strings ('privilege_key', 'run_id', 'pool_count') within the initial handshake payload.
Detects the specific TCP handshake pattern characteristic of the Fast Reverse Proxy (FRP) client (frpc) initiating a connection to a command-and-control server. The rule inspects established traffic for specific metadata strings ('privilege_key', 'run_id', 'pool_count') within the initial handshake payload.
Detects the specific TCP handshake pattern characteristic of the Fast Reverse Proxy (FRP) client (frpc) initiating a connection to a command-and-control server. The rule inspects established traffic for specific metadata strings ('privilege_key', 'run_id', 'pool_count') within the initial handshake payload.
Detects the specific TCP handshake pattern characteristic of the Fast Reverse Proxy (FRP) client (frpc) initiating a connection to a command-and-control server. The rule inspects established traffic for specific metadata strings ('privilege_key', 'run_id', 'pool_count') within the initial handshake payload.
Detects the specific TCP handshake pattern characteristic of the Fast Reverse Proxy (FRP) client (frpc) initiating a connection to a command-and-control server. The rule inspects established traffic for specific metadata strings ('privilege_key', 'run_id', 'pool_count') within the initial handshake payload.
Detects the execution and network activity of known reverse tunneling and proxy tools such as Chisel, Ngrok, and FRP. These tools are commonly abused by adversaries to establish persistence, bypass firewalls, and facilitate command and control (C2) communication. The rule monitors for specific process names, command-line arguments, and DNS requests related to these services.
Detects the execution and network activity of known reverse tunneling and proxy tools such as Chisel, Ngrok, and FRP. These tools are commonly abused by adversaries to establish persistence, bypass firewalls, and facilitate command and control (C2) communication. The rule monitors for specific process names, command-line arguments, and DNS requests related to these services.
Detects a custom frp process enabling both reverse proxy and SOCKS5 functionality from an endpoint not approved as a proxy server. This rule specifically looks for process creation events where the executable name matches common frp variants (wormfrp, frpc, ssh) and the command line arguments indicate the setup of a reverse proxy, SOCKS5 tunnel, or related server connection parameters.
Identifies potential network tunneling, proxying, and reverse shell activities by correlating process creation with outbound public network connections. This rule looks for known tunneling and proxy tool filenames and specific command-line arguments indicative of such activities, then correlates these process events with successful or attempted outbound network connections to public IP addresses.
This rule detects activities associated with the 'CTRL' Russian .Net access framework. It looks for a combination of a hidden PowerShell stager, UAC bypass attempts via registry modification (ms-settings), and the launch of fodhelper.exe. Additionally, it requires the presence of at least one of the following: disguised registry payload storage, FRP configuration file staging, keylogger artifact creation, named pipe creation ('ctrlPipe'), RDP tampering artifacts, or PowerShell commands related to Windows Defender exclusion changes.
KQL Query
This rule detects specific file paths, command-line arguments, and PowerShell commands associated with the Greenbug espionage group's May 2020 campaign, as reported by Symantec. It looks for suspicious executables in ProgramData directories, the use of 'revshell.exe' and 'ncat.exe' (especially with '-e cmd.exe'), and various PowerShell command patterns indicative of malicious activity, including base64 encoded strings.
