There’s a theory that a thousand monkeys typing away at a thousand typewriters will eventually reproduce the works of Shakespeare. I got home one day to find a JavaScript downloader semi-randomly creating dynamic functions until one of them worked and downloaded some malware that I hadn’t seen before. Continue Reading
Malware Analysis
Posts discussing malware analysis techniques.
Previous posts in this series have demonstrated how unpack.py, when used on a CryptoLocker variant, extracts the malicious PE file injected in to explorer.exe, and how it can also be used to analyse the injected PE file. This post demonstrates how unpack.py can now be used to analyse our CryptoLocker variant’s network communications by dumping the cleartext traffic sent over its HTTPS connections.
This is the second part in a series of posts showing how we can use my unpack.py script to find quite a bit of useful information about a CryptoLocker variant. This post will analyse the unpacked payload that we found in part one. Continue Reading
My automated unpacking script (which really needs a sensible name!) is a few years old now, so I was interested to see how it would go with some malware that was developed after it was. That is, I wanted to answer the question ‘is my script still useful?’. It turns out it is still useful, and this post is the first of a few posts that aim to demonstrate why. Continue Reading
… and without touching Perl I might add. So, someone has just handed you a collection of Microsoft Word documents that they believe are malicious and you’re keen to investigate them to see if you can get your hands on some more malware to analyse. Here is how you can analyse Microsoft Word documents in a Linux environment, without using Microsoft Word (and without using Perl). Continue Reading
I was just in the middle of doing a post on analysing a malware sample and I thought that I should start it off by documenting my setup. It then occurred to me that doing so was making my post somewhat longer, and since the setup would apply pretty much to all of my malware analysis work, I should document it separately. So here it is — my malware analysis setup. Continue Reading
It’s been about a year and a half since I wrote about a behavioural approach to automated unpacking, and I figured it was time to add some more functionality to unpack.py. This time, I’m going to look at malware decrypting/decompressing code from within itself, and process hollowing, and see if we can capture the decrypted/decompressed/newly written memory. Let’s spruce unpack.py up a tad. Continue Reading
