Found this when looking through the code of MyDoom/Bloodred, has also been used in many of the MSN spreading techniques.
zip_store( "C:\file.exe", "lawl.exe", "lawl.zip" );
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdio.h>
#pragma pack(push, 1)
struct zip_header_t {
DWORD signature;
WORD ver_needed;
WORD flags;
WORD method;
WORD lastmod_time;
WORD lastmod_date;
DWORD crc;
DWORD compressed_size;
DWORD uncompressed_size;
WORD filename_length;
WORD extra_length;
};
struct zip_eod_t {
DWORD signature;
WORD disk_no;
WORD disk_dirst;
WORD disk_dir_entries;
WORD dir_entries;
DWORD dir_size;
DWORD dir_offs;
WORD comment_len;
};
struct zip_dir_t {
DWORD signature;
WORD made_by;
WORD ver_needed;
WORD flags;
WORD method;
WORD lastmod_time;
WORD lastmod_date;
DWORD crc;
DWORD compressed_size;
DWORD uncompressed_size;
WORD filename_length;
WORD extra_length;
WORD comment_length;
WORD disk_no;
WORD internal_attr;
DWORD external_attr;
DWORD local_offs;
};
#pragma pack(pop)
unsigned long crc32(unsigned long crc, const unsigned char *buf, int len)
{
#define CRC32_POLYNOMIAL 0xEDB88320
unsigned long crc_table[256];
unsigned long crc32;
int i, j;
for (i = 0; i < 256; i++) {
crc32 = i;
for (j = 8; j > 0; j--) {
if (crc32 & 1)
crc32 = (crc32 >> 1) ^ CRC32_POLYNOMIAL;
else
crc32 >>= 1;
}
crc_table[i] = crc32;
}
if (buf == NULL) return 0L;
#define CRC32(c, b) (crc_table[((int)(c) ^ (b)) & 0xff] ^ ((c) >>)
#define DO1(buf) crc = CRC32(crc, *buf++)
#define DO2(buf) DO1(buf); DO1(buf)
#define DO4(buf) DO2(buf); DO2(buf)
#define DO8(buf) DO4(buf); DO4(buf)
crc = crc ^ 0xffffffffL;
#ifndef NO_UNROLLED_LOOPS
while (len >= {
DO8(buf);
len -= 8;
}
#endif
if (len) do {
DO1(buf);
} while (--len);
return crc ^ 0xffffffffL;
}
static void zip_putcurtime(WORD *f_time, WORD *f_date)
{
SYSTEMTIME systime;
GetSystemTime(&systime);
if ((systime.wYear < 1999) || (systime.wYear > 2010))
systime.wYear = 2004;
if (systime.wMonth < 1 || systime.wMonth > 12) systime.wMonth = 1;
if (systime.wDay < 1 || systime.wDay > 31) systime.wDay = 10;
*f_date =
((systime.wYear-1980) << 9) |
(systime.wMonth << 5) |
systime.wDay;
*f_time =
(systime.wHour << 11) |
(systime.wMinute << 5) |
(systime.wSecond / 2);
}
static unsigned long zip_calc_crc32(HANDLE hFileIn)
{
unsigned long reg, i;
unsigned char buf[1024];
SetFilePointer(hFileIn, 0, NULL, FILE_BEGIN);
for (reg=0; {
i = 0;
if (ReadFile(hFileIn, buf, sizeof(buf), &i, NULL) == 0) break;
if (i == 0) break;
reg = crc32(reg, buf, i);
}
SetFilePointer(hFileIn, 0, NULL, FILE_BEGIN);
return reg;
}
int zip_store(char *in, char *out, char *store_as)
{
HANDLE hFileIn, hFileOut;
struct zip_header_t hdr1;
struct zip_eod_t eod1;
struct zip_dir_t dir1;
char buf[1024];
unsigned long i, j, offs;
hFileIn = CreateFile(in, GENERIC_READ, FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFileIn == INVALID_HANDLE_VALUE || hFileIn == NULL)
return 1;
hFileOut = CreateFile(out, GENERIC_WRITE, FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if (hFileOut == INVALID_HANDLE_VALUE || hFileOut == NULL) {
CloseHandle(hFileIn);
return 2;
}
memset(&hdr1, '\0', sizeof(hdr1));
memset(&dir1, '\0', sizeof(dir1));
memset(&eod1, '\0', sizeof(eod1));
offs = 0;
hdr1.signature = 0x04034b50;
dir1.ver_needed = hdr1.ver_needed = 10;
dir1.flags = hdr1.flags = 0;
dir1.method = hdr1.method = 0;
zip_putcurtime(&hdr1.lastmod_time, &hdr1.lastmod_date);
dir1.lastmod_time = hdr1.lastmod_time;
dir1.lastmod_date = hdr1.lastmod_date;
hdr1.crc = zip_calc_crc32(hFileIn);
dir1.crc = hdr1.crc;
hdr1.compressed_size = GetFileSize(hFileIn, NULL);
dir1.compressed_size = hdr1.compressed_size;
hdr1.uncompressed_size = GetFileSize(hFileIn, NULL);
dir1.uncompressed_size = hdr1.uncompressed_size;
hdr1.filename_length = lstrlen(store_as);
dir1.filename_length = hdr1.filename_length;
dir1.extra_length = hdr1.extra_length = 0;
dir1.local_offs = offs;
WriteFile(hFileOut, &hdr1, sizeof(hdr1), &i, NULL);
offs += sizeof(hdr1);
WriteFile(hFileOut, store_as, lstrlen(store_as), &i, NULL);
offs += lstrlen(store_as);
SetFilePointer(hFileIn, 0, NULL, FILE_BEGIN);
for (; {
i = 0;
if (ReadFile(hFileIn, buf, sizeof(buf), &i, NULL) == 0) break;
if (i == 0) break;
WriteFile(hFileOut, buf, i, &j, NULL);
offs += i;
}
eod1.dir_offs = offs;
dir1.signature = 0x02014b50;
dir1.made_by = 20;
dir1.internal_attr = 0;
dir1.external_attr = 0x20;
WriteFile(hFileOut, &dir1, sizeof(dir1), &i, NULL);
offs += sizeof(dir1);
WriteFile(hFileOut, store_as, lstrlen(store_as), &i, NULL);
offs += lstrlen(store_as);
eod1.signature = 0x06054b50;
eod1.disk_no = 0;
eod1.disk_dirst = 0;
eod1.disk_dir_entries = 1;
eod1.dir_entries = eod1.disk_dir_entries;
eod1.dir_size = offs - eod1.dir_offs;
eod1.comment_len = 0;
WriteFile(hFileOut, &eod1, sizeof(eod1), &i, NULL);
CloseHandle(hFileOut);
CloseHandle(hFileIn);
return 0;}
