Last week we noticed this tweet on twitter from @JohnLaTwc: https://twitter.com/JohnLaTwC/status/952948929628291072
We are big fans of John’s tweets, and often use his discoveries to help build simulated malware campaigns for clients in Red-Teaming. This one was particularly interesting so we decided to dive into this one a little deeper.
The macro payload can be found here:
There appears to be different payloads targeted at different Microsoft Operating Systems:
- Windows 7
- Windows 8- 8.1
- Windows 10
Netscylla decided to take a look at the Windows 10 payload (payloadv10.exe). It looks like it has already been uploaded to virus total and hybrid analysis from @CryptoInsane (twitter).
- https://www.reverse.it/sample/0acc9adbbdbd6db359552e2919aabc3ca4a42a28b3b7c3d26fb8f0699d23bdc2?environmentId=100 SureRansom.exe appears to be the real binary compiled name, and initial inspection looks like some form of British Ransomware demanding £50GBP to recover your files.
The Desktop Wallpaper is replaced with ‘Hard Drive Encrypted‘ ransom’ Further examination of the hybrid analysis and virus total reports, reveals the following IP addresses:
Whois on IP Address
The IP address belongs to cloud infrastructure provider Digital Ocean, this is likely the Command and Control interface for this piece of malware?
NetRange: 188.8.131.52–184.108.40.206 CIDR: 220.127.116.11/16 NetName: DIGITALOCEAN-15 Reverse DNS: competitivebeauty.com
Diving Deeper into the Payloadv10.exe
First we give the executable a once over with PEStudio for some hints to its maker, operation and possible code-base.
There is a big clue in the debug path:
Now we have some hints that the author is Surecloud and that this executable is part of a Red-Team, penetration test or ransomware simulation!
Lets take this a little bit further…
The executable is a .Net compiled executable so we can use JustDecompile to disassemble the application into .Net classes and procedures
This executable has the following operations:
Call home IP matches the C2 address from earlier:
The malware collects information on local and domain users:
The malware sends all collected data unencrypted over the public internet:
Did we forget something? Isn’t this meant to be ransomware…
Not really, as the decompiled code clearly indicates this is a simulation.
LinkedIn quick search for Surecloud, confirms a professional Penetration Test Team in United Kingdom:
Ransom? What Ransom?
Looking at the decompiled code, there is no functionality to process or take payments. This ‘malware’ is only a simulated exercise!
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