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import struct
from collections import defaultdict
from elfesteem import pe
from elfesteem import cstruct
from elfesteem import *
from miasm2.jitter.csts import *
from utils import canon_libname_libfunc
import logging
log = logging.getLogger('loader_pe')
hnd = logging.StreamHandler()
hnd.setFormatter(logging.Formatter("[%(levelname)s]: %(message)s"))
log.addHandler(hnd)
log.setLevel(logging.CRITICAL)
def get_import_address_pe(e):
import2addr = defaultdict(set)
if e.DirImport.impdesc is None:
return import2addr
for s in e.DirImport.impdesc:
# fthunk = e.rva2virt(s.firstthunk)
# l = "%2d %-25s %s" % (i, repr(s.dlldescname), repr(s))
libname = s.dlldescname.name.lower()
for ii, imp in enumerate(s.impbynames):
if isinstance(imp, pe.ImportByName):
funcname = imp.name
else:
funcname = imp
# l = " %2d %-16s" % (ii, repr(funcname))
import2addr[(libname, funcname)].add(
e.rva2virt(s.firstthunk + e._wsize * ii / 8))
return import2addr
def preload_pe(vm, e, runtime_lib, patch_vm_imp=True):
fa = get_import_address_pe(e)
dyn_funcs = {}
# log.debug('imported funcs: %s' % fa)
for (libname, libfunc), ads in fa.items():
for ad in ads:
ad_base_lib = runtime_lib.lib_get_add_base(libname)
ad_libfunc = runtime_lib.lib_get_add_func(ad_base_lib, libfunc, ad)
libname_s = canon_libname_libfunc(libname, libfunc)
dyn_funcs[libname_s] = ad_libfunc
if patch_vm_imp:
vm.set_mem(
ad, struct.pack(cstruct.size2type[e._wsize], ad_libfunc))
return dyn_funcs
def is_redirected_export(e, ad):
# test is ad points to code or dll name
out = ''
for i in xrange(0x200):
c = e.virt(ad + i)
if c == "\x00":
break
out += c
if not (c.isalnum() or c in "_.-+*$@&#()[]={}"):
return False
if not "." in out:
return False
i = out.find('.')
return out[:i], out[i + 1:]
def get_export_name_addr_list(e):
out = []
# add func name
for i, n in enumerate(e.DirExport.f_names):
addr = e.DirExport.f_address[e.DirExport.f_nameordinals[i].ordinal]
f_name = n.name.name
# log.debug('%s %s' % (f_name, hex(e.rva2virt(addr.rva))))
out.append((f_name, e.rva2virt(addr.rva)))
# add func ordinal
for i, o in enumerate(e.DirExport.f_nameordinals):
addr = e.DirExport.f_address[o.ordinal]
# log.debug('%s %s %s' % (o.ordinal, e.DirExport.expdesc.base,
# hex(e.rva2virt(addr.rva))))
out.append(
(o.ordinal + e.DirExport.expdesc.base, e.rva2virt(addr.rva)))
return out
def vm_load_pe(vm, fname, align_s=True, load_hdr=True,
**kargs):
e = pe_init.PE(open(fname, 'rb').read(), **kargs)
aligned = True
for s in e.SHList:
if s.addr & 0xFFF:
aligned = False
break
if aligned:
if load_hdr:
hdr_len = max(0x200, e.NThdr.sizeofheaders)
min_len = min(e.SHList[0].addr, 0x1000)#e.NThdr.sizeofheaders)
pe_hdr = e.content[:hdr_len]
pe_hdr = pe_hdr + min_len * "\x00"
pe_hdr = pe_hdr[:min_len]
vm.add_memory_page(
e.NThdr.ImageBase, PAGE_READ | PAGE_WRITE, pe_hdr)
if align_s:
for i, s in enumerate(e.SHList[:-1]):
s.size = e.SHList[i + 1].addr - s.addr
s.rawsize = s.size
s.data = strpatchwork.StrPatchwork(s.data[:s.size])
s.offset = s.addr
s = e.SHList[-1]
s.size = (s.size + 0xfff) & 0xfffff000
for s in e.SHList:
data = str(s.data)
data += "\x00" * (s.size - len(data))
# log.debug('SECTION %s %s' % (hex(s.addr),
# hex(e.rva2virt(s.addr))))
vm.add_memory_page(
e.rva2virt(s.addr), PAGE_READ | PAGE_WRITE, data)
# s.offset = s.addr
return e
# not aligned
log.warning('pe is not aligned, creating big section')
min_addr = None
max_addr = None
data = ""
if load_hdr:
data = e.content[:0x400]
data += (e.SHList[0].addr - len(data)) * "\x00"
min_addr = 0
for i, s in enumerate(e.SHList):
if i < len(e.SHList) - 1:
s.size = e.SHList[i + 1].addr - s.addr
s.rawsize = s.size
s.offset = s.addr
if min_addr is None or s.addr < min_addr:
min_addr = s.addr
if max_addr is None or s.addr + s.size > max_addr:
max_addr = s.addr + max(s.size, len(s.data))
min_addr = e.rva2virt(min_addr)
max_addr = e.rva2virt(max_addr)
log.debug('%s %s %s' %
(hex(min_addr), hex(max_addr), hex(max_addr - min_addr)))
vm.add_memory_page(min_addr,
PAGE_READ | PAGE_WRITE,
(max_addr - min_addr) * "\x00")
for s in e.SHList:
log.debug('%s %s' % (hex(e.rva2virt(s.addr)), len(s.data)))
vm.set_mem(e.rva2virt(s.addr), str(s.data))
return e
def vm_load_pe_lib(fname_in, libs, lib_path_base, patch_vm_imp, **kargs):
fname = os.path.join(lib_path_base, fname_in)
e = vm_load_pe(fname, **kargs)
libs.add_export_lib(e, fname_in)
# preload_pe(e, libs, patch_vm_imp)
return e
def vm_load_pe_libs(libs_name, libs, lib_path_base="win_dll",
patch_vm_imp=True, **kargs):
lib_imgs = {}
for fname in libs_name:
e = vm_load_pe_lib(fname, libs, lib_path_base, patch_vm_imp)
lib_imgs[fname] = e
return lib_imgs
def vm_fix_imports_pe_libs(lib_imgs, libs, lib_path_base="win_dll",
patch_vm_imp=True, **kargs):
for e in lib_imgs.values():
preload_pe(e, libs, patch_vm_imp)
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