This commit moves much of the platform-specific logic from the
reverse_http handler down into the payloads. This makes the handler
a bit more agnostic of what the payload is (which is a good thing).
There is more to do here though, and things can be improved.
Handling of datastore settings has been changed to make room for the
ability to override the datastore completely when generating the
payloads. If a datastore is given via the `opts` then this is used
instead otherwise it falls back to the settings specified in the usual
datatstore location.
Down the track, we'll have a payload that supports multiple stages, and
the datastore will be generated on the fly, along with the stage itself.
Without this work, there's no other nice way of getting datastore
settings to be contained per-stager.
Using the ruby methods for generating assembly blocks defined or
separated in prior commits, create a new payload from the existing
assembly blocks which performs a DNS lookup of the LHOST prior to
establishing a corresponding socket and downloading, and
decrypting the RC4 encrypted payload.
For anyone looking to learn how to build these payloads, these
three commits should provide a healthy primer. Small changes to
the payload structure can yield entropy enough to avoid signature
based detection by in-line or out-of-band static defenses. This
payload was completed in the time between this commit and the last.
Testing:
Win2k8r2
ToDo:
Update payload sizes when this branch is "complete"
Ensure UUIDs and adjacent black magic all work properly
Using the separation of block_recv and reverse_tcp, implement
reverse_tcp_dns using original shellcode as template with dynamic
injection of parameters. Concatenate the whole thing in the
generation call chain, and compile the resulting shellcode for
delivery.
Metasploit module pruned to bare minimum, with the LHOST OptString
moved into the library component.
Testing:
Win2k8r2
ToDo:
Update payload sizes when this branch is "complete"
Ensure UUIDs and adjacent black magic all work properly
Misc:
Clean up rc4.rb to use the rc4_keys method when generating a
stage. Makes the implementation far more readable and reduces
redundant code.
Convert reverse_tcp_rc4 and bind_tcp_rc4 from static shellcode
substitution payloads to metasm compiled assembly approach.
Splits up metasm methods for bind_tcp and reverse_tcp into socket
creation and block_recv to allow for reuse of the socket methods
with the RC4 payloads, while substituting the block_recv methods
for those carrying the appropriate decryptor stubs.
Creates a new rc4 module carrying the bulk of the decryptor and
adjacent convenince methods for standard payload generation.
Testing:
Tested against Win2k8r2, Win7x64, and WinXPx86
ToDo:
Ensure all the methods around payload sizing, UUIDs, and other
new functionality, the semantics of which i do not yet fully
understand, are appropriate and do not introduce breakage.
William Webb
OJ
Brent Cook
David Maloney
scriptjunkie
William Vu
Brendan Watters
RageLtMan
Rory McNamara
jvazquez-r7
HD Moore
benpturner