Cobalt Strike Free Download
Vickiana Sconyers
Cobalt Strike is a commercial penetration testing tool used by security professionals to test the security of networks and systems. It is a versatile tool that includes a range of features and capabilities, including:
The main use of Cobalt Strike is to assess the security of networks and systems. It is a commercial penetration testing tool that is commonly used by security professionals to test the security of networks and systems, and to identify and exploit potential vulnerabilities and weaknesses.
While Cobalt Strike is primarily used by security professionals to assess the security of networks and systems, it is also used by cybercriminals for malicious purposes. For several reasons, cobalt Strike has also become a favorite tool of black hackers. Some of the key reasons include its power and versatility and its ability to remotely control and monitor attacks and generate detailed reports on their activities.
While Cobalt Strike can be used for malicious purposes, it is not banned because it is also a valuable tool for security professionals and because banning it would not necessarily prevent its use by black hackers.
There is no simple way to block Cobalt Strike on your network. Implementing advanced tools like SentinelOne Singularity XDR would keep your endpoint and other assets safe from this risk. To improve your risk from malicious activity done using Cobalt Strike, you can follow these steps:
Overall, blocking Cobalt Strike on your network requires a combination of technical controls, security assessments, and security awareness training to identify and prevent potential threats and vulnerabilities.
Cobalt Strike and Metasploit are commercial penetration testing tools commonly used by security professionals to assess the security of networks and systems. However, there are some key differences between the two tools that are worth noting:
While Cobalt Strike and Metasploit are both powerful and useful tools for penetration testing, they have different capabilities and features and may be more suitable for different security assessments and scenarios.
Empire is a free and open-source post-exploitation tool commonly used by security professionals to assess the security of networks and systems. Empire is based on the popular PowerShell scripting language and allows users to create, manage, and execute various types of payloads, such as backdoors, remote shells, and keyloggers, on infected systems.
Empire is known for its ability to stealthily infiltrate networks, evade detection, and steal sensitive information, such as login credentials, passwords, and financial data. It is also highly modular, allowing users to easily extend their capabilities and adapt to different environments and scenarios.
Cobalt Strike and PowerShell Empire are commercial penetration testing tools commonly used by security professionals to assess the security of networks and systems. However, there are some key differences between the two tools that are worth noting:
While Cobalt Strike and PowerShell Empire are both powerful and useful tools for penetration testing, they have different capabilities and features and may be more suitable for different security assessments and scenarios.
BruteRatel C4 is a commercial penetration testing tool commonly used by security professionals to assess the security of networks and systems. BruteRatel C4 is known for its ability to rapidly generate and try different combinations of passwords to gain unauthorized access to systems and networks.
BruteRatel C4 is highly customizable, allowing users to specify the type of passwords to generate, the length and complexity of the passwords, and the number of passwords to try. It can also run multiple instances in parallel to increase the speed and efficiency of the password-cracking process.
While Cobalt Strike and BruteRatel C4 are both powerful and useful tools for penetration testing, they have different capabilities and features and may be more suitable for different security assessments and scenarios. Here are some key differences between the two tools that are worth noting:
Cobalt Strike is a commercial adversary simulation software that is marketed to red teams but is also stolen and actively used by a wide range of threat actors from ransomware operators to espionage-focused Advanced Persistent Threats (APTs). Many network defenders have seen Cobalt Strike payloads used in intrusions, but for those who have not had the opportunity to use Cobalt Strike as an operator, it can be challenging to understand the many components and features included in this framework.
In this blog post, we will walk through important definitions and concepts to help defenders understand Cobalt Strike and, hopefully, identify new ways to hunt for, respond to, and attribute malicious actors using this tool.
Cobalt Strike is the command and control (C2) application itself. This has two primary components: the team server and the client. These are both contained in the same Java executable (JAR file) and the only difference is what arguments an operator uses to execute it.
Loaders are not BEACON. BEACON is the backdoor itself and is typically executed with some other loader, whether it is the staged or full backdoor. Cobalt Strike does come with default loaders, but operators can also create their own using PowerShell, .NET, C++, GoLang, or really anything capable of running shellcode.
Listeners are the Cobalt Strike component that payloads, such as BEACON, use to connect to a team server. Cobalt Strike supports several protocols and supports a wide range of modifications within each listener type. Some changes to a listener require a "listener restart" and generating a new payload. Some changes require a full team server restart.
Arsenal Kits are available for download, with a valid license, and for use with licensed (or cracked) installations only. Arsenal kits are sometimes distributed with cracked copies of Cobalt Strike. The full list of kits (as of October 2021) is:
Malleable Profile is the final part of Arsenal Kit, and it allows operators to extensively modify how their Cobalt Strike installation works. It is the most common way operators customize Cobalt Strike and has thus been heavily documented.
Aggressor Scripts are macros that operators can write and load in their client to streamline their workflow. These are loaded and executed within the client context and don't create new BEACON functionality, so much as automate existing commands. They are written in a Perl-based language called "Sleep" which Raphael Mudge (the creator of Cobalt Strike) wrote. For an example, check out the "An Operator's View" section.
Beacon Object Files (BOFs) are a fairly recent Cobalt Strike feature that allows operators to extend BEACON post-exploitation functionality. BOFs are compiled C programs that are executed in memory on a targeted host. In contrast to Aggressor Scripts, BOFs are loaded within a BEACON session and can create new BEACON capabilities. Additionally, compared to other BEACON post-exploitation commands like execute-assembly, BOFs are relatively stealthy as they run within a BEACON session and do not require a process creation or injection.
An operator accessing a team server through the Cobalt Strike client would see a view like the following. The top pane shows a list of active beacon sessions with basic metadata including the current user, process ID, internal and external IP addresses, and the last time the host checked in with the team server. The bottom pane includes a tab for each session where operators can send commands to the victim hosts and see a log of past commands and output. The client interface also allows operators to build payloads, execute plugins, and generate reports.
Within the client, operators can import Aggressor Scripts to customize their commands, menu options, and interface. Aggressor Scripts vary in complexity, from adding a new menu shortcut to chaining multiple attack steps. The following is an excerpt from credpocalypse.cna, an Aggressor Script that checks active beacon sessions on a schedule and runs Mimikatz, an open-source credential dumper, if a new user logs in.
Beacon Object Files are single file C programs that are run within a BEACON session. BOFs are expected to be small and run for a short time. Since BEACON sessions are single threaded, BOFs will block any other BEACON commands while they are executing. The following is an example from the Cobalt Strike documentation that uses Dynamic Function Resolution to look up the current domain.
Earlier, I mentioned there are "two types of BEACON", one of them being a stager. Operators can have stagers for multiple listener types (e.g. a DNS stager, an SMB stager, an HTTPS stager). In those cases, when the stager shellcode is executed, it will pull the final BEACON payload over the relevant protocol and execute it, establishing a connection using the defined listener method.
An important note for defenders is that, by default, defenders can download a Cobalt Strike HTTP/S stager payload from a team server even if the operator is not using staged payloads in their operations. This will allow defenders to 1. confirm something is hosting a team server with a listener on that port and 2. extract additional configuration artifacts from the payload.
This works because Cobalt Strike was designed to be compatible with Metasploit's Meterpreter payload. Metasploit (and thus Cobalt Strike) will serve an HTTPS stager when a valid URL request is received. A valid URL is any 4-character alphanumeric value with a valid 8 bit checksum calculated by adding the ASCII values of the 4 characters.
Operators can prevent defenders from retrieving stagers by setting the host_stage Malleable Profile value to "false". More commonly, they may use reverse proxies to filter out unwanted traffic like stager requests. As a protection feature, Cobalt Strike will ignore web requests with blacklisted User-Agents, such as curl or wget. Starting in Cobalt Strike 4.4, operators can also whitelist user agents with the .http-config.allow_useragents Malleable Profile option. These caveats are important to remember, since a team server may not always function as expected by scanners that automate stager requests.
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