To round out the work done by mihi for x86 stages back in the day,
this PR provides x64 Windows stage encryption in RC4 via assembly
written/modified by max3raza during adjacent work on DNS tunneled
transport.
Stage encryption differs from encoding in that there is no decoder
stub or key materiel carried with the stage which can be used by
defensive systems to decode and identify the contents. Persistence
payloads, oob-delivered stage0, and other contexts benefit heavily
from this as their subsequent stage is difficult to detect/identify,
and the chance of accidental execution of the wrong payload/stage
is drastically reduced if separate keys are in play for individual
targets - acquiring the wrong stage will result in decryption
failure and prevent further execution.
For historical context, all of the RC4 stagers implement in-place
decryption via stage0 for the contents of stage1 using the provided
passphrase converted to a key and embedded in stage0 as part of the
payload.
Testing:
In-house testing with Max - we got sessions, loaded extensions.
Notes:
All credit for the work goes to Max3raza - big ups for getting
this knocked out.
If there is no :private_type, the create_credential method in
Metasploit::Credential::Creation will quietly skip the password,
which makes it look like a bug when the user is trying to view
the password from the creds command.
Fix#9513
Starting from MySQL 5.7 the password column was changed to authentication_string. I've added a check to determine the version. Tested on both MySQL 5.6 and 5.7.
If a command is not specified to CommandStream, request a "shell"
session rather than running exec. This allows targets that do not have a
true "shell" which supports exec to instead return a raw shell session.
Quentin Kaiser