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.
this method was absed around a char limit
for the desc column which no longer exists
trying to perform this operation generates an error
removing the method since it is not needed
This patch fixes two problems:
1. 6820 - If the HTTP server returns a relative path
(example: /test), there is no host to extract, therefore the HOST
header in the HTTP request ends up being empty. When the web
server sees this, it might return an HTTP 400 Bad Request, and
the redirection fails.
2. 6806 - If the HTTP server returns a relative path that begins
with a dot, send_request_cgi! will literally send that in the
GET request. Since that isn't a valid GET request path format,
the redirection fails.
Fix#6806Fix#6820
James Lee
Brendan Watters
Louis Sato
RageLtMan
Brent Cook
Adam Cammack
wchen-r7
Christian Mehlmauer
David Maloney
dmohanty-r7
Brian Patterson
thao doan
OJ
Rory McNamara
Spencer McIntyre