mirror of
https://github.com/Offensive-Panda/ProcessInjectionTechniques
synced 2026-06-06 16:24:33 +00:00
Offensive-Panda
122 lines
3.8 KiB
C
122 lines
3.8 KiB
C
#include "syscalls.h"
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SW2_SYSCALL_LIST SW2_SyscallList;
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DWORD SW2_HashSyscall(PCSTR FunctionName)
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{
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DWORD i = 0;
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DWORD Hash = SW2_SEED;
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while (FunctionName[i])
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{
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WORD PartialName = *(WORD*)((ULONG64)FunctionName + i++);
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Hash ^= PartialName + SW2_ROR8(Hash);
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}
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return Hash;
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}
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BOOL SW2_PopulateSyscallList(void)
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{
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// Return early if the list is already populated.
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if (SW2_SyscallList.Count) return TRUE;
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#ifdef _WIN64
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PSW2_PEB Peb = (PSW2_PEB)__readgsqword(0x60);
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#else
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PSW2_PEB Peb = (PSW2_PEB)__readfsdword(0x30);
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#endif
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PSW2_PEB_LDR_DATA Ldr = Peb->Ldr;
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PIMAGE_EXPORT_DIRECTORY ExportDirectory = NULL;
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PVOID DllBase = NULL;
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// Get the DllBase address of NTDLL.dll. NTDLL is not guaranteed to be the second
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// in the list, so it's safer to loop through the full list and find it.
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PSW2_LDR_DATA_TABLE_ENTRY LdrEntry;
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for (LdrEntry = (PSW2_LDR_DATA_TABLE_ENTRY)Ldr->Reserved2[1]; LdrEntry->DllBase != NULL; LdrEntry = (PSW2_LDR_DATA_TABLE_ENTRY)LdrEntry->Reserved1[0])
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{
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DllBase = LdrEntry->DllBase;
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PIMAGE_DOS_HEADER DosHeader = (PIMAGE_DOS_HEADER)DllBase;
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PIMAGE_NT_HEADERS NtHeaders = SW2_RVA2VA(PIMAGE_NT_HEADERS, DllBase, DosHeader->e_lfanew);
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PIMAGE_DATA_DIRECTORY DataDirectory = (PIMAGE_DATA_DIRECTORY)NtHeaders->OptionalHeader.DataDirectory;
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DWORD VirtualAddress = DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress;
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if (VirtualAddress == 0) continue;
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ExportDirectory = (PIMAGE_EXPORT_DIRECTORY)SW2_RVA2VA(ULONG_PTR, DllBase, VirtualAddress);
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// If this is NTDLL.dll, exit loop.
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PCHAR DllName = SW2_RVA2VA(PCHAR, DllBase, ExportDirectory->Name);
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if ((*(ULONG*)DllName | 0x20202020) != 'ldtn') continue;
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if ((*(ULONG*)(DllName + 4) | 0x20202020) == 'ld.l') break;
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}
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if (!ExportDirectory) return FALSE;
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DWORD NumberOfNames = ExportDirectory->NumberOfNames;
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PDWORD Functions = SW2_RVA2VA(PDWORD, DllBase, ExportDirectory->AddressOfFunctions);
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PDWORD Names = SW2_RVA2VA(PDWORD, DllBase, ExportDirectory->AddressOfNames);
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PWORD Ordinals = SW2_RVA2VA(PWORD, DllBase, ExportDirectory->AddressOfNameOrdinals);
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DWORD i = 0;
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PSW2_SYSCALL_ENTRY Entries = SW2_SyscallList.Entries;
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do
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{
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PCHAR FunctionName = SW2_RVA2VA(PCHAR, DllBase, Names[NumberOfNames - 1]);
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// Is this a system call?
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if (*(USHORT*)FunctionName == 'wZ')
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{
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Entries[i].Hash = SW2_HashSyscall(FunctionName);
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Entries[i].Address = Functions[Ordinals[NumberOfNames - 1]];
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i++;
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if (i == SW2_MAX_ENTRIES) break;
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}
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} while (--NumberOfNames);
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// Save total number of system calls found.
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SW2_SyscallList.Count = i;
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// Sort the list by address in ascending order.
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for (i = 0; i < SW2_SyscallList.Count - 1; i++)
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{
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for (DWORD j = 0; j < SW2_SyscallList.Count - i - 1; j++)
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{
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if (Entries[j].Address > Entries[j + 1].Address)
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{
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// Swap entries.
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SW2_SYSCALL_ENTRY TempEntry;
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TempEntry.Hash = Entries[j].Hash;
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TempEntry.Address = Entries[j].Address;
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Entries[j].Hash = Entries[j + 1].Hash;
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Entries[j].Address = Entries[j + 1].Address;
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Entries[j + 1].Hash = TempEntry.Hash;
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Entries[j + 1].Address = TempEntry.Address;
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}
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}
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}
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return TRUE;
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}
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EXTERN_C DWORD SW2_GetSyscallNumber(DWORD FunctionHash)
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{
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// Ensure SW2_SyscallList is populated.
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if (!SW2_PopulateSyscallList()) return -1;
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for (DWORD i = 0; i < SW2_SyscallList.Count; i++)
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{
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if (FunctionHash == SW2_SyscallList.Entries[i].Hash)
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{
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return i;
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}
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}
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return -1;
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}
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