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in this series we will be looking at the start up options and diagnostics of mbstudio 8 pro . the program is a great introduction to all your malware analysis and reverse engineering skills. it is a very capable program for both beginners and experienced reverse engineers.
in this article we will look at a previously undescribed hidden/autorun feature in mbstudio 8. we will firstly look at its structure, options and then finally some practical examples of how to use the autorun command in practice.
although looking at this executable and trying to understand it’s structure is somewhat challenging for the newcomer, once understood it can be the base of much later exploration of how the program operates.
to confirm this we can use the section view in pe explorer. this view will show all the pe sections within the executable. if you expand the section, this will show the functions that are imported or exported in it.
this is my first crack at cracking for mbs. i start with pwcrack (http://www.openwall.com/pwcrack/). i choose to look for the database file since i already had a bit of linux experience and i figured the ubuntu setup would be quite similar to a centos setup.
import gzip import re from pyrsa.security.pkcs import asn1decoder, asn1encoder class oldpkcs7(object): def get_sz(self, size, block): def zos(n): if n == 0: return "0" elif n < 0: return "-".join(re.escape("-", "\\-")) + str(n).zfill(abs(n)) elif n > 0: return str(abs(n)).zfill(size) else: return str(n).zfill(size) z = zos(size + 1) u = re.sub('\(||[^()]*\)', '|', z) v = re.sub(r"\s*\)|\s*(?:,|\)|\s*$", "|", u) if v.startswith("0"): return z return "-".escape("-", "\\-").replace("-", "|", 1)) + v def get_value_octets(self, sequence): buf =  i = sequence.index(0) for r in range(i, i + 1): d = sequence[r - i] buf.append(d) return buf def get_value_hex(self, sequence): buf =  i = sequence.