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dr5.py
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dr5.py
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#Very hackish code, but it seems to work for majority of DR5 binaries
#Written by JaGoTu
#https://github.com/jagotu/dr5_loader
import ida_entry
import ida_idaapi
import ida_idp
import ida_kernwin
import ida_bytes
import ida_name
import ida_segment
import ida_segregs
import ida_struct
import os
import struct
NE_HEADER_MAGIC = b"NE"
MZ_HEADER_MAGIC = b"MZ"
SEG_STRUCT_SIZE = 12
segtable = {}
segimportstable = {}
importedmodules = {}
enttable = {}
toexport = []
def DB(f):
return struct.unpack("<B", f.read(1))[0]
def DW(f):
return struct.unpack("<H", f.read(2))[0]
def DD(f):
return struct.unpack("<I", f.read(4))[0]
def nDB(ea, name):
ida_bytes.create_data(ea, ida_bytes.FF_BYTE, 1, ida_idaapi.BADADDR)
ida_name.set_name(ea, name, ida_name.SN_NOCHECK)
def nDW(ea, name):
ida_bytes.create_data(ea, ida_bytes.FF_WORD, 2, ida_idaapi.BADADDR)
ida_name.set_name(ea, name, ida_name.SN_NOCHECK)
def nDD(ea, name):
ida_bytes.create_data(ea, ida_bytes.FF_DWORD, 4, ida_idaapi.BADADDR)
ida_name.set_name(ea, name, ida_name.SN_NOCHECK)
def rnDB(f, name, off):
nDB(f.tell() - off, name)
return DB(f)
def rnDW(f, name, off):
nDW(f.tell() - off, name)
return DW(f)
def rnDD(f, name, off):
nDD(f.tell() - off, name)
return DD(f)
def defSEGENT():
sid = ida_struct.get_struc_id("SEGENT")
if sid != ida_idaapi.BADADDR:
struc = ida_struct.get_struc(sid)
ida_struct.del_struc(struc)
sid = ida_struct.add_struc(ida_idaapi.BADADDR, "SEGENT", 0)
struc = ida_struct.get_struc(sid)
ida_struct.add_struc_member(struc, "flags", ida_idaapi.BADADDR, ida_bytes.FF_WORD, None, 2)
ida_struct.add_struc_member(struc, "oSegment", ida_idaapi.BADADDR, ida_bytes.FF_WORD, None, 2)
ida_struct.add_struc_member(struc, "nParagraphs", ida_idaapi.BADADDR, ida_bytes.FF_WORD, None, 2)
ida_struct.add_struc_member(struc, "nReloc", ida_idaapi.BADADDR, ida_bytes.FF_WORD, None, 2)
ida_struct.add_struc_member(struc, "minAlloc", ida_idaapi.BADADDR, ida_bytes.FF_WORD, None, 2)
ida_struct.add_struc_member(struc, "unused", ida_idaapi.BADADDR, ida_bytes.FF_WORD, None, 2)
return sid
def defENTENT():
sid = ida_struct.get_struc_id("ENTENT")
if sid != ida_idaapi.BADADDR:
struc = ida_struct.get_struc(sid)
ida_struct.del_struc(struc)
sid = ida_struct.add_struc(ida_idaapi.BADADDR, "ENTENT", 0)
struc = ida_struct.get_struc(sid)
ida_struct.add_struc_member(struc, "flags", ida_idaapi.BADADDR, FF_BYTE, None, 1)
ida_struct.add_struc_member(struc, "addr", ida_idaapi.BADADDR, FF_WORD, None, 2)
return sid
def makePASSTR(ea):
length = ida_bytes.get_byte(ea)
ida_bytes.create_strlit(ea, length + 1, ida_bytes.STRTYPE_PASCAL)
return length
def readPASSTR(ea):
out = ""
length = ida_bytes.get_byte(ea)
ea += 1
for i in range(length):
out += chr(ida_bytes.get_byte(ea + i))
return out
def readPASSTRF(f):
length = f.read(1)[0]
if length == 0:
return ""
else:
return f.read(length).decode()
def make_entry(val, name):
if val != 0:
segNo = (val >> 16) - 1
segStart = segtable[segNo].start_ea
segOff = (val & 0xFFFF)
addr = segStart + segOff
ida_entry.add_entry(addr, addr, name, 1)
def loadExportsF(f):
f.seek(0)
magic = f.read(2)
if magic == MZ_HEADER_MAGIC:
f.seek(0x22)
MZlen = DW(f) * 16
f.seek(MZlen)
magic = f.read(2)
if magic != NE_HEADER_MAGIC:
return None
headerStart = f.tell() - 2
f.seek(headerStart + 0x34)
cbNam = DW(f)
pNam = DW(f)
f.seek(headerStart + 0x3C)
cbNRNam = DW(f)
pNRNam = DW(f)
table = {}
f.seek(headerStart + pNam)
while f.tell() < headerStart + pNam + cbNam:
name = readPASSTRF(f)
if len(name) == 0:
DW(f)
continue
ordinal = DW(f)
table[ordinal] = name
f.seek(headerStart + pNRNam)
while f.tell() < headerStart + pNRNam + cbNRNam:
name = readPASSTRF(f)
if len(name) == 0:
DW(f)
continue
ordinal = DW(f)
table[ordinal] = name
return table
def loadExports(filename):
with open(filename, "rb") as f:
return loadExportsF(f)
def accept_file(f, filename):
if filename == 0 or type(filename) == str:
f.seek(0)
magic = f.read(2)
if magic == NE_HEADER_MAGIC:
return "Plain New Executable (NE) DR5"
if magic == MZ_HEADER_MAGIC:
f.seek(0x22)
MZlen = DW(f) * 16
f.seek(MZlen)
magic = f.read(2)
if magic == NE_HEADER_MAGIC:
return "New Executable (NE) DR5"
return 0
def load_file(f, neflags, fileformatname):
f.seek(0)
ida_idp.set_processor_type("metapc", ida_idp.SETPROC_LOADER)
MGROUPStart = 0
magic = f.read(2)
if magic == MZ_HEADER_MAGIC:
f.seek(0x22)
MGROUPStart = DW(f) * 16
f.seek(MGROUPStart)
magic = f.read(2)
headerSize = DW(f)
segmentDataAlignment = DW(f)
nextExeOff = DD(f)
SegDataOff = DD(f)
f.file2base(MGROUPStart, 0, SegDataOff, True)
ida_segment.add_segm(0, 0, 0x50, "HEADER", "MODULE")
ida_segment.set_segm_addressing(ida_segment.getseg(0), 0)
f.seek(MGROUPStart)
magic = rnDW(f, "magic", MGROUPStart)
headerSize = rnDW(f, "headerSize", MGROUPStart)
segmentDataAlignment = rnDW(f, "segmentDataAlignment", MGROUPStart)
nextExeOff = rnDD(f, "nextExeOff", MGROUPStart)
SegDataOff = rnDD(f, "SegDataOff", MGROUPStart)
ResDataOff = rnDD(f,"ResDataOff", MGROUPStart)
flags = rnDW(f,"flags", MGROUPStart)
version = rnDB(f,"version", MGROUPStart)
revision = rnDB(f,"revision", MGROUPStart)
AutoDataSegNo = rnDW(f,"AutoDataSegNo", MGROUPStart)
HeapSize = rnDW(f,"HeapSize", MGROUPStart)
StackSize = rnDW(f,"StackSize", MGROUPStart)
StartProc = rnDD(f,"StartProc", MGROUPStart)
LoadProc = rnDD(f,"LoadProc", MGROUPStart)
FreeProc = rnDD(f,"FreeProc", MGROUPStart)
nSegments = rnDW(f,"nSegments", MGROUPStart)
pSegTable = rnDW(f,"pSegTable", MGROUPStart)
cbResTab = rnDW(f,"cbResTab", MGROUPStart)
pResTab = rnDW(f,"pResTab", MGROUPStart)
cbEntTab = rnDW(f,"cbEntTab", MGROUPStart)
pEntTab = rnDW(f,"pEntTab", MGROUPStart)
cbNamTab = rnDW(f,"cbNamTab", MGROUPStart)
pNamTab = rnDW(f,"pNamTab", MGROUPStart)
cbStrTab = rnDW(f,"cbStrTab", MGROUPStart)
pStrTab = rnDW(f,"pStrTab", MGROUPStart)
cbNRNamTab = rnDW(f,"cbNRNamTab", MGROUPStart)
pNRNamTab = rnDW(f,"pNRNamTab", MGROUPStart)
ida_segment.add_segm(0, pSegTable, pSegTable + (nSegments * SEG_STRUCT_SIZE), "SEGTABLE", "MODULE")
ida_segment.set_segm_addressing(ida_segment.getseg(pSegTable), 0)
ida_segment.add_segm(0, pResTab, pResTab + cbResTab, "RESOURCES", "MODULE")
ida_segment.set_segm_addressing(ida_segment.getseg(pResTab), 0)
ida_segment.add_segm(0, pEntTab, pEntTab + cbEntTab, "ENTTABLE", "MODULE")
ida_segment.set_segm_addressing(ida_segment.getseg(pEntTab), 0)
ida_segment.add_segm(0, pNamTab, pNamTab + cbNamTab, "ENTNAME", "MODULE")
ida_segment.set_segm_addressing(ida_segment.getseg(pNamTab), 0)
ida_segment.add_segm(0, pStrTab, pStrTab + cbStrTab, "IMPORTS", "MODULE")
ida_segment.set_segm_addressing(ida_segment.getseg(pStrTab), 0)
ida_segment.add_segm(0, pNRNamTab, pNRNamTab + cbNRNamTab, "NRENTNAME", "MODULE")
ida_segment.set_segm_addressing(ida_segment.getseg(pNRNamTab), 0)
#parse segtable
segentsid = defSEGENT()
base = SegDataOff // 16
importCount = 0
for i in range(nSegments):
segEntStart = pSegTable + i * SEG_STRUCT_SIZE
ida_bytes.create_struct(segEntStart, SEG_STRUCT_SIZE, segentsid)
segStart = ida_bytes.get_word(segEntStart + 2)
segLen = ida_bytes.get_word(segEntStart + 4)
segImports = ida_bytes.get_word(segEntStart + 6)
importCount += segImports
f.file2base(MGROUPStart + SegDataOff+segStart * 16, SegDataOff + segStart * 16, SegDataOff + (segStart + segLen) * 16, True)
segBase = (base + segStart) * 16
#segmentDef = ida_segment.segment_t()
#segmentDef.start_ea = segBase
#segmentDef.end_ea = (base + segStart + segLen) * 16
#ida_segment.set_selector()
print(base + segStart)
ida_segment.add_segm(base + segStart, segBase, (base + segStart + segLen) * 16, "", "", 0)
sel = ida_segment.find_selector(base + segStart)
seg = ida_segment.getseg(segBase)
ida_segment.set_segm_addressing(seg, 0)
segtable[i] = seg
segimportstable[i] = segImports
if i + 1 == AutoDataSegNo:
ida_segment.set_segm_name(seg, "_DATA", 0)
ida_segment.set_segm_class(seg, "DATA", 0)
dataSel = sel
else:
ida_segment.set_segm_name(seg, "_TEXT", 0)
ida_segment.set_segm_class(seg, "CODE", 0)
if AutoDataSegNo == 0:
dataSel = sel
ida_segregs.set_default_dataseg(dataSel)
#parse enttable
pENT = pEntTab
currord = 1
while pENT < pEntTab + cbEntTab:
bundleCount = ida_bytes.get_byte(pENT)
bundleFlags = ida_bytes.get_byte(pENT + 1)
if bundleCount == 0 and bundleFlags == 0:
break
pENT += 2
for i in range(bundleCount):
if bundleFlags == 0xFF:
ordFlags = ida_bytes.get_byte(pENT)
if ordFlags & 0x80:
toexport.append(currord)
segNo = ida_bytes.get_byte(pENT + 3)
segOff = ida_bytes.get_word(pENT + 4)
enttable[currord] = (segtable[segNo - 1].start_ea // 16, segOff)
pENT += 6
else:
ordFlags = ida_bytes.get_byte(pENT)
if ordFlags & 0x80:
toexport.append(currord)
segOff = ida_bytes.get_word(pENT + 1)
enttable[currord] = (segtable[bundleFlags - 1].start_ea // 16, segOff)
pENT += 3
currord += 1
modulename = readPASSTR(pNamTab)
make_entry(StartProc, modulename.capitalize() + "Start")
make_entry(LoadProc, modulename.capitalize() + "Load")
make_entry(FreeProc, modulename.capitalize() + "Free")
#export named ordinals
namedordtable = loadExportsF(f)
for i in toexport:
if i in namedordtable:
name = namedordtable[i]
else:
name = modulename + "_" + str(i)
(base, off) = enttable[i]
addr = base * 16 + off
ida_entry.add_entry(i, addr, name, 1)
#process imports
ida_segment.add_segm(0xF000, 0xF0000, 0xF0000 + importCount * 2, "IMPORTS", "XTRN", 0)
ida_segment.set_segm_addressing(ida_segment.getseg(0xF0000), 0)
import_ea = 0xF0000
for seg in segtable:
segend = segtable[seg].end_ea
f.seek(MGROUPStart + segend)
for i in range(segimportstable[seg]):
count = DB(f)
mode = DB(f)
relocStart = DW(f)
module = DW(f)
proc = DW(f)
if(module == 0xFFFF):
(base, off) = enttable[proc]
else:
modulestr = readPASSTR(pStrTab + module)
if (proc & 0x8000) != 0: # read by ord
ordinal = proc & 0x7FFF
procname = modulestr + "_" + str(ordinal)
if not modulestr in importedmodules:
if os.path.isfile(modulestr + ".EXE"):
importedmodules[modulestr] = loadExports(modulestr + ".EXE")
else:
filename = ida_kernwin.ask_file(0, modulestr + ".EXE", "Select file to name exports")
if filename is not None and os.path.isfile(filename):
importedmodules[modulestr] = loadExports(filename)
else:
importedmodules[modulestr] = None
if modulestr in importedmodules and (importedmodules[modulestr] is not None) and ordinal in importedmodules[modulestr]:
procname = importedmodules[modulestr][ordinal]
else:
procname = readPASSTR(pStrTab + proc)
ida_bytes.create_data(import_ea, ida_bytes.FF_WORD, 2, ida_idaapi.BADADDR)
ida_name.force_name(import_ea, procname)
ida_bytes.set_cmt(import_ea, "Imported from " + modulestr, 1)
base = 0xF000
off = import_ea - 0xF0000
import_ea += 2
for xx in range(count):
next = ida_bytes.get_word(segtable[seg].start_ea + relocStart)
if mode == 0x20:
ida_bytes.put_word(segtable[seg].start_ea + relocStart + 2, base)
ida_bytes.put_word(segtable[seg].start_ea + relocStart, off)
elif mode == 0x10:
ida_bytes.put_word(segtable[seg].start_ea + relocStart, off)
elif mode == 0x0:
ida_bytes.put_word(segtable[seg].start_ea + relocStart, base)
relocStart = next
#print "import %d: seg %d mode %s count %d relocStart %s module %s proc %s" % (i, seg, hex(mode), count, hex(relocStart), modulestr, hex(proc))
return 1