![]() ![]() The default network SSID that the module creates is named “WiSnap-xxxx,” where xxxx is a unique identifier number. If RS-232 is not available, you can connect to the WiSnap’s ad-hoc network, and configure it wirelessly. Powering the WiSnap unit will print out a few boot messages to the terminal (if configured properly). Configure the port for 9600 baud, 8 data bits, 1 stop bit, no parity, and no flow control. Once connected, launch your Terminal program, such as JavaTerm, PuTTY, TeraTerm, or HyperTerminal. ![]() You can configure WiSnap settings with the RS-232 interface to an open serial port on your PC, or by using an USB-to-Serial adapter. NOTE: This should happen twice since two COM ports are being installed. ![]() Allow Windows to search and install the software drivers automatically. The screen is shown below and to the right asks if you would like to install shortcuts in the Start Menu and if you would like to add a default pair of COM ports during installation.Īfterward, Windows may bring up the “Found New Hardware Wizard.” This is because the virtual COM ports were detected. Click “Next >” through the dialog screens and agree to the license to complete the installation. Running the “setup.exe” begins installation as a standard wizard. All data sent from the “A” port will be mirrored on the “B” port of the same pair, and vice-versa. These names can be changed, but the default convention begins with “CNC,” followed by the A-B pairing, and the final digit at the end represents the number of the pair. The COM port pairs will be given names starting at CNCA0 and CNCB0. You can create as many pairs of virtual COM port as you like, and use any pair to connect one application to another. You can download the com0com installer HERE. The first step is to install the Null-modem emulator (com0com) application, which installs and works as a driver for a pair (or many pairs) of virtual COM ports. Here we run the “PortBender backdoor 443 3389 praetorian.antihacker” to instruct the backdoor service to redirect any connections to 443/TCP to 3389/TCP on the compromised host from any IP address that provides the specified “praetorian.antihacker” keyword.This page demonstrates how a COM-to-TCP connection can be made from a PC to the WiSnap RS232 adapter. In this example, we want to deploy the covert persistence mechanism on a compromised Internet-facing IIS webserver. In this example, we run the command “PortBender redirect 445 8445” to accomplish this. To facilitate this, we can instruct PortBender to redirect all traffic to 445/TCP to an alternative port 8445/TCP running an attacker SMB service. PortBender backdoor 443 3389 praetorian.antihackerįor example, we may wish to execute PortBender in redirector mode to perform an SMB relay attack from a compromised Windows system. Redirect Usage: PortBender redirect FakeDstPort RedirectedPortīackdoor Usage: PortBender backdoor FakeDstPort RedirectedPort Password The help menu for PortBender with the example usage is shown below: To execute PortBender we must first import the “PortBender.cna” script into Cobalt Strike and upload the WinDivert32.sys or WinDivert64.sys binary included in “PortBender.zip” to the target host depending on the operating system architecture. An operator can leverage this mechanism to emulate the persistence technique used by the Duqu 2.0 threat actor when compromising Kaspersky. PortBender then adds that client IP address to a list of backdoor clients and redirects all traffic to that target port to an alternative port (e.g., 3389/TCP). In “backdoor mode,” we only redirect traffic if an attacker sends a specially formatted TCP packet to a target port (e.g., 443/TCP). The first is “redirector mode,” and the second is “backdoor mode.” In “redirector mode,” any connection to a targeted destination port (e.g., 445/TCP) is redirected to an alternative port (e.g., 8445/TCP).
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