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starting removing the PE parsing in ExtractOffsets.py to get rid of r2

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This commit is contained in:
Maxime Meignan
2023-10-27 16:18:42 +02:00
parent aa408ced60
commit d38b84d179
3 changed files with 66 additions and 24 deletions
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EDRSandblast/Utils/PdbParser.c
+2
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@@ -1,5 +1,7 @@
#include <Windows.h>
// Written from information found here: https://llvm.org/docs/PDB/index.html
typedef DWORD ulittle32_t;
typedef struct SuperBlock_t {
EDRSandblast_StaticLibrary/EDRSandblast_StaticLibrary.vcxproj
+6
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@@ -127,6 +127,9 @@
</SubSystem>
<GenerateDebugInformation>true</GenerateDebugInformation>
</Link>
<Lib>
<IgnoreSpecificDefaultLibraries>libcmt.lib</IgnoreSpecificDefaultLibraries>
</Lib>
</ItemDefinitionGroup>
<ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
<ClCompile>
@@ -147,6 +150,9 @@
<OptimizeReferences>true</OptimizeReferences>
<GenerateDebugInformation>true</GenerateDebugInformation>
</Link>
<Lib>
<IgnoreSpecificDefaultLibraries>libcmt.lib</IgnoreSpecificDefaultLibraries>
</Lib>
</ItemDefinitionGroup>
<ItemGroup>
<ClCompile Include="EDRSandblast_API.c" />
Offsets/ExtractOffsets.py
+58 -24
View File
@@ -129,33 +129,57 @@ def get_field_offset(symbols_info, field_name):
else:
return 0
from pefile import PE, DIRECTORY_ENTRY
def get_file_version(path):
# dump version number using r2
r = run(["r2", "-c", "iV", "-qq", path], capture_output=True)
for line in r.stdout.decode().splitlines():
line = line.strip()
if line.startswith("FileVersion:"):
return [int(frag) for frag in line.split(" ")[-1].split(".")]
pe = PE(path,fast_load=True)
pe.parse_data_directories(directories=[DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_RESOURCE']])
if not 'VS_FIXEDFILEINFO' in pe.__dict__ or not pe.VS_FIXEDFILEINFO:
raise RuntimeError("Version info not found in {pename}")
verinfo = pe.VS_FIXEDFILEINFO[0]
filever = (verinfo.FileVersionMS >> 16, verinfo.FileVersionMS & 0xFFFF, verinfo.FileVersionLS >> 16, verinfo.FileVersionLS & 0xFFFF)
return filever
print(f'[!] ERROR : failed to extract version from {path}.')
raise RuntimeError("get_file_version error")
# Takes a path to a PE file as argument, download the associated PDB
# Return True if it succeeded of if the PDB was already present
def get_pdb(pe_path, verbose=False):
pdb_file_path = pe_path.rsplit(".", maxsplit=1)[0] + ".pdb"
if not os.path.isfile(pdb_file_path):
if verbose: print(f"[*] Downloading missing {pdb_file_path}")
pe = PE(pe_path, fast_load=True)
pe.parse_data_directories(directories=[DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_DEBUG']])
guid_string = f"{pe.DIRECTORY_ENTRY_DEBUG[0].entry.Signature_Data1:08X}" + \
f"{pe.DIRECTORY_ENTRY_DEBUG[0].entry.Signature_Data2:04X}" + \
f"{pe.DIRECTORY_ENTRY_DEBUG[0].entry.Signature_Data3:04X}" + \
f"{pe.DIRECTORY_ENTRY_DEBUG[0].entry.Signature_Data4:02X}" + \
f"{pe.DIRECTORY_ENTRY_DEBUG[0].entry.Signature_Data5:02X}" + \
pe.DIRECTORY_ENTRY_DEBUG[0].entry.Signature_Data6.hex().upper()
age_string = f"{pe.DIRECTORY_ENTRY_DEBUG[0].entry.Age:X}"
pdb_filename = pe.DIRECTORY_ENTRY_DEBUG[0].entry.PdbFileName.decode().replace("\x00","")
pdb_url = f'https://msdl.microsoft.com/download/symbols/{pdb_filename}/{guid_string}{age_string}/{pdb_filename}'
try:
pdbContent = get(pdb_url)
assert len(pdbContent.content) > 0
with open(pdb_file_path, 'wb') as f:
f.write(pdbContent.content)
if verbose: print(f'[+] Finished download PDB of {pe_path} version (file: {pdb_file_path})!')
except Exception as e:
print(f'[!] ERROR : Could not download PDB of {pe_path} (URL: {pdb_url}): {str(e)}.')
return False
return True
def extractOffsets(input_file, output_file, mode):
if os.path.isfile(input_file):
try:
# check image type (ntoskrnl, wdigest, etc.)
r = run(["r2", "-c", "iE", "-qq", input_file], capture_output=True)
for line in r.stdout.decode().splitlines():
line = line.lower()
if "ntoskrnl.exe" in line:
imageType = "ntoskrnl"
break
elif "wdigest.dll" in line:
imageType = "wdigest"
break
elif "ci.dll" in line:
imageType = "ci"
break
pe = PE(input_file,fast_load=True)
pe.parse_data_directories(directories=[DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_EXPORT']])
name = pe.DIRECTORY_ENTRY_EXPORT.name.decode().lower()
if "ntoskrnl.exe" in name:
imageType = "ntoskrnl"
elif "wdigest.dll" in name:
imageType = "wdigest"
elif "ci.dll" in name:
imageType = "ci"
else:
print(f"[*] File {input_file} unrecognized")
return
@@ -179,7 +203,7 @@ def extractOffsets(input_file, output_file, mode):
# print(f'[*] Processing {imageType} version {imageVersion} (file: {input_file})')
# download the PDB if needed
r = run(["r2", "-c", "idpd", "-qq", input_file], capture_output=True)
get_pdb(input_file)
# dump all symbols
r = run(["r2", "-c", "idpi", "-qq", '-B', '0', input_file], capture_output=True)
all_symbols_info = [line.strip() for line in r.stdout.decode().splitlines()]
@@ -225,7 +249,7 @@ def extractOffsets(input_file, output_file, mode):
except Exception as e:
print(f'[!] ERROR : Could not process file {input_file}.')
print(f'[!] Error message: {e}')
print(f'[!] If error is of the like of "\'NoneType\' object has no attribute \'group\'", kernel callbacks may not be supported by this version.')
#print(f'[!] If error is of the like of "\'NoneType\' object has no attribute \'group\'", kernel callbacks may not be supported by this version.')
elif os.path.isdir(input_file):
print(f'[*] Processing folder: {input_file}')
@@ -249,6 +273,17 @@ def loadOffsetsFromCSV(loadedVersions, CSVPath):
for peLine in csvReader:
loadedVersions.append(peLine[0])
def sortOutputFile(csvFile):
def lineKey(line):
major = int(line.split("_")[1].split("-")[0])
minor = int(line.split("-")[1].split(".")[0])
return (major, minor)
with open(csvFile) as f:
header_line = f.readline()
content = f.readlines()
with open(csvFile, "w") as f:
f.write(header_line)
f.writelines(sorted(set(content), key=lineKey))
if __name__ == '__main__':
parser = argparse.ArgumentParser()
@@ -291,8 +326,6 @@ if __name__ == '__main__':
except (subprocess.CalledProcessError, FileNotFoundError):
print('[!] ERROR : On Linux systems, radare2 needs cabextract to be installed to work with PDB.')
exit(1)
if "R2_CURL" not in os.environ:
print("WARNING : On Linux systems, radare2 may have trouble to download PDB files. If offsets are reported as 0, export R2_CURL=1 prior to running the script.")
# If the output file exists, load the already analyzed image versions.
@@ -324,3 +357,4 @@ if __name__ == '__main__':
# Extract the offsets from the specified file or the folders containing image files.
extractOffsets(args.input, args.output, mode)
sortOutputFile(args.output)