Get the txt pkcs7 from the der

gistfile1.txt

import os
import subprocess
from OpenSSL.crypto import PKCS7Type, load_pkcs7_data

directory = "/Users/michael/Downloads/Torrents/VirusShare_APT1_281/"
size_array = []
write_file = True
get_txt = True

for files in os.listdir(directory):
    try:
       pe = pefile.PE(directory+files)
       address = pe.OPTIONAL_HEADER.DATA_DIRECTORY[pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_SECURITY']].VirtualAddress
       size = pe.OPTIONAL_HEADER.DATA_DIRECTORY[pefile.DIRECTORY_ENTRY['IMAGE_DIRECTORY_ENTRY_SECURITY']].Size
       if address!=0:
          #print "VA:%s, Size %s" % (address,size)
          signature = pe.write()[address+8:]
          if write_file:
             oname = directory+files+".der"
             tname = directory+files+".txt"
             outfile = open(oname,'wb')
             outfile.write(signature)
             outfile.close()
             if get_txt:
                cmd = "openssl pkcs7 -inform DER -print_certs -text -in %s > %s" % (oname,tname)
                os.system(cmd)
                '''If you want to return STDOUT to a variable then use subprocess rather than os.system
                p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
                out, error = p.communicate()
                txt_signature = out
                print txt_signature'''
          #p7 = load_pkcs7_data(FILETYPE_ASN1,signature)
          #print type(p7)
    except pefile.PEFormatError:
       print "Something wrong with the file"