Let’s Analyze: Dridex (Part 2)
In the previous article we went over how to dump the names of the majority of functions dridex resolves dynamically to complicate analysis. Today we will be using some similar methods to get the other main piece of the puzzle (encrypted string). Encrypted Strings As we’ve already got a nice list …
Let’s Analyze: Dridex (Part 1)
Due to popular request I’m starting a new reverse engineering article series which will detail how I go about analyzing various samples, instead of just presenting my findings like I normally do. Most of the posts will be centered around IDA Pro (evaluation edition should work too) with WinDbg as …
DDoSing with Other People’s Botnets
While I was reverse engineering ZeroAccess in order to write a monitoring system, I had an idea which would allow me to use ZeroAccess C&C infrastructure to reflect and amplify a UDP based DDoS attack, which I’d found to be beautifully ironic. After further analysis, I discovered it may even …
Necurs.P2P – A New Hybrid Peer-to-Peer Botnet
Last week I received a tip about a sample displaying some indication that it could be peer-to-peer (a large amount of UDP traffic being sent to residential IPs), after a couple days of analysis I was able to confirm that not only was it peer-to-peer but also currently active. The person …
When Scriptkiddies Attack
Usually I don’t blog about the hundreds of ridiculous or down right crazy emails I receive each year, but this exchange makes all the others seem completely reasonable in comparison. Normally my unwanted emails range from people asking obviously blackhat questions presented as whitehat questions to offers of under the …
Backdoored Ransomware for Educational Purposes
Here is an interesting article I found this week, it’s about how A researcher released two pieces of ‘educational’ ransomware which were secretly backdoored in order to own some advanced and prolific cyber-criminals a small number of scriptkiddies. There two pieces were HiddenTear (a ransomware with deliberately insecure cryptography designed to …
Exploring Peer to Peer Botnets
Peer to Peer and Everything In between Back in October I’d gotten bored of the endless stream of cryptolockers and PoS trojan, so decided to look at something old school, that something was Kelihos. Since then, I’ve come to realize that P2P botnet monitoring brings together two of my favorite …
Kelihos Analysis – Part 1
In the recent years I’ve noticed a shift in the malware economy from botnets to ransomware, which is likely due to the AV industry employing more aggressive tactics against botnets resulting in a drop in profitability. As I’ve said before: ransomware is about as interesting to me is watching oil …
Device Guard – The Beginning of the End for Malware?
Finally I manage to put together a computer capable of running Device Guard and I’ve had a little bit of time to play around with the code signing part. Everyone is probably already familiar with x64 driver signature enforcement (64-bit Windows systems can only load signed drivers); Well, now Microsoft …
Hidden VNC for Beginners
Hidden VNC is a creative solution to a solution to a problem which stemmed from banking fraud. Back years ago when fraud was uncommon, most banks only had basic IP or Geo-location checks to flag or block accounts if someone logged in from another computer. To combat this, banking trojans …