Created
May 27, 2016 16:42
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Unpack last stage of h1n1 loader
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import sys | |
import pefile | |
from unicorn import * | |
from unicorn.x86_const import * | |
pe = pefile.PE(sys.argv[1]) | |
for s in pe.sections: | |
if s.Name.strip("\x00") == '.rsrc': | |
code_section = s | |
if s.Name.strip("\x00") == '.Upack': | |
data_section = s | |
base = pe.OPTIONAL_HEADER.ImageBase | |
ep = pe.OPTIONAL_HEADER.AddressOfEntryPoint + base | |
STACK = 0x90000 | |
mu = Uc(UC_ARCH_X86, UC_MODE_32) | |
#mmap_binary(mu,pe) | |
## map binary | |
mu.mem_map(base, 0x1000) | |
mu.mem_map(base + code_section.VirtualAddress,code_section.Misc_VirtualSize) | |
mu.mem_map(base + data_section.VirtualAddress,data_section.Misc_VirtualSize) | |
#map stack - two pages | |
mu.mem_map(STACK,4096*2) | |
mu.mem_write(base, pe.get_data()[:pe.OPTIONAL_HEADER.SizeOfHeaders]) | |
mu.mem_write(base + code_section.VirtualAddress,code_section.get_data()) | |
mu.reg_write(UC_X86_REG_ESP,STACK+4096) | |
### add some hooks | |
#mu.hook_add(UC_HOOK_WRITE_UNMAPPED,unmaped_hook) | |
#mu.hook_add(UC_HOOK_MEM_READ_UNMAPPED | UC_HOOK_MEM_WRITE_UNMAPPED, hook_mem_invalid) | |
#mu.hook_add(UC_HOOK_CODE, hook_code) | |
try: | |
mu.emu_start(ep,16) | |
except UcError as e: | |
print("ERROR: %s" % e) | |
data = mu.mem_read(base+data_section.VirtualAddress,data_section.Misc_VirtualSize) | |
data_section.SizeOfRawData = len(data) | |
data_section.PointerToRawData = code_section.PointerToRawData | |
data_section.Name = ".code".ljust(8,"\x00") | |
pe.set_bytes_at_rva(data_section.VirtualAddress,str(data)) | |
code_section.PointerToRawData = 0 | |
code_section.SizeOfRawData = 0 | |
pe.write('/tmp/h1n1_unpacked.exe') | |
#raise UcError('done') |
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