Timelapse
Gaining Access
Nmap scan reveals the default AD ports that are open.
Null Session
As usual, I always check the shares that I can access with no credentials, and found one here.
Within this share, we can find a winrm_backup.zip file that has a password on its files.
This is easily crackable with zip2john and john.
After unzipping the file, we can get a pfx file out. PFX files contains SSL certificates and private keys that could be useful for this machine.
I tried to import the certificate or extract the keys but this file is also password protected.
pfx2john and john again.
With this, we can extract the private key.
We also need to extract the .crt file using openssl pkcs12 -in legacyy_dev_auth.pfx -clcerts -nokeys -out legacyy_dev_auth.crt.
Certificate Abuse
When we extracted the private key and certificate, we can use evil-winrm to get into the machine.
We are then the legacyy user on the machine.
Privilege Escalation
PS History
Running a WinPEAS, we can find that our current user has a Powershell HIstory present:
The PS History has commands used for remote Powershell-ing as another user called svc_deploy.
We can use this to gain a reverse shell as the svc_deploy user using whatever method. nc.exe is the easiest.
LAPS_Readers
When checking this user's privileges, we can see that we are part of the LAPS_Readers group within the domain:
This means we can dump out the credentials for the DC:
Then, we can just evil-winrm in as the administrator using these credentials. Either that or execute scriptblocks with more remote Powershell.
