12 Aug

How security plugins for Autoplay Media Studio fail, pt.2

Few weeks ago I wrote an article about misunderstood security in Autoplay Media Studio plugins. Two days later, author of DCrypto plugin released an updated version of the plugin. And just recently, he started to sell his plugin by making some pretty bold claims:

I present to you DCrypto with an advanced encryption that allows you to obfuscate your LUA 1.5 code in 256 Bit encryption with one of the best encryptions on the market, in addition to optimizing your source code, it will be protected with super protection.

Let's see how super this protection really is! smile
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19 Jul

How security plugins for Autoplay Media Studio fail

Every once in a while I encounter a strange anti-reverse engineering protection. Protection authors are so focused on improving one specific aspect of the protection that completely overlook other, much easier ways how the system can be defeated.

Their logic is like this - someone stole my code, I better protect it. I've heard that cryptography is good, so I'll use that. Oh no, someone stole my code again! Let me add another layer of encryption over it! Few days/weeks/months later - Those bloody hackers won't stop! Let me protect my encryption code with another encryption!

Facepalm.

What the authors should do instead is stop and think. What do I want to protect? Against whom? For how long? What kind of loss is acceptable to me?

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31 Dec 2021

Update of unpackers

Enigma Virtual Box unpacker

There are plenty of changes.

  • Properly detect versions 9.50..9.90
  • Unpacks files packed with 9.80 and 9.90
  • Added command-line parameter "/nodiskspace", as requested by some users. If it crashes during unpacking because it ran out of disk space, it's your problem.
  • Unpacker properly handles invalid input filename

Molebox 2.x unpacker

  • Support more versions of very old Molebox
  • Unpacking files with digital signatures should be improved
  • Some rare bugs have been fixed

Autoplay Media Studio unpacker

  • Added support for AMS version 8.5.3.0.
  • Support for Imagine MemoryEx encrypted files, as requested by someone.

What is MemoryEx?

MemoryEx is a plugin released by Imagine Programming, allowing for more advanced operations from within the Lua environment you will find in Autoplay Media Studio 8.

While it's not a very common plugin, there are several niche programs which use this plugin. For example, most programs from dindroid.com use it.

When you unpack such file, please pay attention to the "Found protected file" messages:

As you can see, unpacker created some .luac files.

Next, you will need to find a LUA decompiler and decompile these files. I suggest you try unluac, luadec or whichever LUA decompiler you prefer.

Decompiler should produce .lua file which contains all the interesting stuff. For example, part of G-Nerator code looks like this:

That's all folks, have fun using it!

As always - if you notice any bugs, please report them. And most importantly - Happy New Year everybody! smile

24 Jun 2021

WordPress Fancy Product Designer exploit

Today in my web server logs I noticed repeated scans for "fancy-product-designer" - a WordPress plugin which I most definitely don't have installed.

Few Google searches later, I found an article by Wordfence titled "Critical 0-day in Fancy Product Designer Under Active Attack". As usual, all the important details were missing from their article, so I decided to fill-in the gaps. smile

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22 Apr 2021

Kaswara exploit or how much Wordfence cares about user security

Yesterday, an alert describing vulnerability in Kaswara Modern VC Addons was published on WPScan.

The plugin allows unauthenticated arbitrary file upload via the 'uploadFontIcon' AJAX action. The supplied zipfile being unzipped in the wp-content/uploads/kaswara/fonts_icon directory with no checks for malicious files such as PHP.

Alert explicitly warns that the bug is actively being exploited. Alert also provided a very limited indicators of compromise - incomplete but at least something..

Later that day, "WordPress security vendor" Wordfence published their article Remove Kaswara Modern WPBakery Page Builder Addons Plugin Immediately.

They repeated what was already said in the alert mentioned above and gave 2 extremely "useful" suggestions. First suggestion is in the post title - remove the plugin. Second suggestion is to pay for Wordfence services. Because Wordfence free version will start protecting users only in end of May 2021:

May 21, 2021 – Wordfence Free users receive the firewall rules.

Think about it for a moment..

Wordfence knows the issue is actively being exploited. They know exactly what the issue is. But they don't care about you or your security! All they care about is their profit. So, unless you pay a hefty sum for their "services", you're screwed.

I think it's wrong, so let's fix that! smile

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15 Aug 2020

Deobfuscating AutoIt scripts, part 2

Almost 4 years ago, I wrote a blogpost about deobfuscating a simple AutoIt obfuscator. Today I have a new target which is using a custom obfuscator. smile

Update: This obfuscator is called ObfuscatorSG and can be downloaded from Github. Thanks Bartosz Wójcik!

Author had a very specific request about the methods used to solve the crackme:

If I'm allowed to be picky, I'm primarily interested in scripted efforts to RegEx analyze strings/integers. Very little effort (as in none) went into hiding the correct string. The script was merely passed-through a self-made obfuscator.

In this article I'll show the things I tried, where and how I failed miserably and my final solution for this crackme. I really suggest that you download the crackme from tuts4you and try replicating each step along the way, that way it will be much easier to follow the article.

So, let's get started!
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10 May 2020

Update of unpackers

I'm trying to get back into reversing. Slowly.

So, here's a long-promised update to Molebox unpacker. It fixes unpacking of very, VERY, VERY old Molebox versions. The only file I have ever seen packed with it, is SCWU role playing game.

Enigma Virtual Box unpacker

This was done long time ago but I never posted it publicly. Support for Enigma Virtual Box 9.30/9.40. Should support 9.50 but it's not tested.