The other commands that inject into a remote process are: The post-exploitation job commands (previously mentioned) rely on process injection too.
COBALT STRIKE BEACON UPLOAD DOWNLOAD
Use the POWERSHELL_DOWNLOAD_CRADLE Aggressor Script hook to shape the download cradle used to download these scripts.
To get around this, these features host a script on a self-contained web server within your Beacon session. The jump winrm, jump winrm64, and powershell commands deal with PowerShell content that is too large to fit in a single command-line. Use the POWERSHELL_COMMAND Aggressor Script hook to change the format of the PowerShell command and its arguments. Use the ppid command to change the parent process powershell.exe is run under. The following commands launch powershell.exe to perform some task on your behalf.
COBALT STRIKE BEACON UPLOAD HOW TO
Read How to Pass-the-Hash with Mimikatz for instructions on how to do this manually. The command pattern to pass this token is an indicator some host-based security products look for. The pth command relies on cmd.exe to pass a token to Beacon via a named pipe. Use run to run a command and get output without cmd.exe
The ppid command does not affect runas or runu. The ppid command will change the parent process of commands run by execute. The recommendation is to inject into a process that can be safely terminated by you to cleanup in-memory artifacts. Cobalt Strike detects and acts on self-injection different from remote injection.Įxplicit injection will not cleanup any memory after the post-exploitation job has completed. For features that have an explicit injection option, consider injecting into your current Beacon process. Malleable C2's post-ex block has several OPSEC options for these post-ex DLLs themselves. Malleable C2's process-inject block gives a lot of control over the process injection process. The blockdlls command will stop userland hooking for some security products. Ppid command will change the parent process these jobs are run under as well. The default is rundll32.exe (you probably don’t want that). Use the spawnto command to change the process Beacon will launch for its post-exploitation jobs. Psinject Fork&Run or Target Explicit Process And (iv) this design decision keeps a lot of clutter (threads, suspicious content) generated by your post-ex action out of your Beacon process space. This allows the post-ex action to occur within different contexts without the need to migrate or spawn a payload in (iii) Some features can target a specific remote process. This was critical as Beacon didn't have an 圆4īuild until 2016. (ii) historically, this scheme makes it seamless for an x86 Beacon to launch 圆4 post-exploitation tasks. Protects the agent if the capability crashes. Beacon does this for a number of reasons: (i) this Many Beacon post-exploitation features spawn a process and inject a capability into that process. Set the startrwx/userwx hints in Malleable C2's process-inject block to change the initial or final memory permissions. OPSEC Adviceīeacon Object Files use RWX memory by default. The network interface resolution within both the portscan and covertvpn dialogs uses a Beacon Object File as well. The capability is cleaned up after it finishes running. A Beacon Object File is a compiled C program, written to a certain convention, that executes within a Beacon session. The following commands are implemented as internal Beacon Object Files. Some of these commands (e.g., clear,ĭownloads, help, mode, note) do not generate a task for Beacon to execute. The following commands are built into Beacon and exist to configure Beacon or perform house-keeping actions. The following commands are built into Beacon and rely on Win32 APIs to meet their objectives: This document surveys Beacon'sĬommands and provides background on which commands inject into remote processes, which commands spawn jobs, and which commands rely on cmd.exe or Beacon Command Behavior and OPSEC ConsiderationsĪ good operator knows their tools and has an idea of how the tool is accomplishing its objectives on their behalf.
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