You can use whatever you want here, so long as it’s two characters.
#INSTALL COBALT STRIKE 3.5 CODE#
We’ve also added set magic_pe which changes the PE header magic bytes (and code that depends on these bytes) to something else.
The same idea applies for set magic_mz_圆4 too. They undo the effect of the MZ instructions. The R and E bytes decode to push edx, inc ebp. This is why the default magic_mz_x86 value is MZRE. You don’t want to begin execution with unexpected state, so it’s also recommended to undo any state changes made by your instructions. For example, MZ in x86 are the instructions dec ebp, pop edx. The catch is that valid x86 instructions are required for magic_mz_x86. This updates the other parts of the loading process that depend on the value. Set magic_mz_x86 to change the x86 Reflective DLL MZ header in Beacon. These items are easy “it has to be there” content to find a Reflective DLL. A common in-memory detection trick is to scan executable memory regions for MZ and PE content that looks like a PE/COFF file.
#INSTALL COBALT STRIKE 3.5 PATCH#
We patch the beginning of the DLL (the part with that MZ header) with instructions to call the Reflective Loader with a few arguments. Beacon’s Reflective DLL follows Metasploit’s conventions to make itself self-bootstrapping. We’ve also added new options for content flexibility. This is in addition to VirtualAlloc (the default) and 3.11’s module stomping, which is our way of putting Beacon into image memory. Set stage -> allocator to MapViewOfFile to stick Beacon in mapped memory. Set stage -> allocator to HeapAlloc to use RWX heap memory for the Beacon payload.
But, it’s also important to challenge security teams that rely on these tactics, to force thinking beyond that “one easy trick” that’s working right now.Ĭobalt Strike 4.2 continues to build Beacon’s in-memory flexibility.īeacon’s Reflective Loader now has two added options for allocating memory for the Beacon payload in memory. I love in-memory detections, because I think these tactics put real pressure on post-exploitation survival. More In-memory FlexibilityĬobalt Strike has long had an interest in in-memory detection and evasion. And, we’ve added a post-ex -> keylogger Malleable C2 option to change the keystroke logger between GetAsyncKeyState and SetWindowsHookEx methods. This command was inspired by the creative and awesome Advanced Post-Exploitation Workshop given by and at 2017’s DEF CON 25. The printscreen command forces a PrintScr keypress and grabs the screenshot from the clipboard. The screenwatch command (which can fork&run or inject into a specific process) takes screenshots continuously until it’s stopped with the jobkill command.Īs believers in offense in depth, we’ve added new options to acquire screenshots and log keystrokes too. The screenshot command takes a single screenshot.
We also split screenshot into two commands: screenshot and screenwatch. And, save the keystroke buffer or screenshot to a local file as well. You can now remove a keystroke buffer or screenshot from the interface. The right-click menu in the screenshot and keystroke has updates too. It’s a subtle change, but a big enhancement: This context helps our GUI, logs, and reports display where this information came from. But, with good UX, these features are also powerful capabilities to collect information that aids moving closer to an objective in a network.Ĭobalt Strike’s screenshot tool and keystroke logger now report active window, username, and desktop session with each of their results. These capabilities are great for risk demonstration and story telling. User Exploitation ReduxĬobalt Strike’s screenshot tool and keystroke logger are examples of user exploitation tools. This release overhauls our user exploitation features, adds more memory flexibility options to Beacon, adds more behavior flexibility to our post-exploitation features, and makes some nice changes to Malleable C2 too.
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