Test subject – Troldesh/Shade ransomware
This is a 0-day variant of Troldesh/Shade ransomware. The ransomware family has a five-year history and has seen many improvements since the first version. It’s typically distributed via email campaigns, weaponizing office documents, using social engineering to manipulate users.
Troldesh/Shade ransomware test facts
The new variant is also very clever. It uses a TOR client to communicate with the command and control servers, encrypting all transmissions. It’s also a combo, as it is not just ransomware, but also a crypto-mining malware and servers/websites hacking tool.
The attack begins as soon as the js is executed by downloading all the necessary payloads from the infected servers. The payloads are packed in such ways, that they clearly attempt to avoid detection by antimalware solutions as much as possible. Once downloaded, they are executed in a specific order, using command line interpreters, in another attempt to avoid detection. They are also digitally signed, although the signature is invalid. The payloads collect many sensitive data, such as user name, public IP, hardware related specifics etc.
Once everything is in place, encryption starts, which is the first phase of the attack. The files are renamed, their original names are base64 encoded, and they also receive a new extension “.crypted000007”. The desktop background is changed and ransom notes are dropped in many places. Volume shadow copies are also deleted.
The second phase consists of executing the secondary downloads. These are CMS brute-forcers, SQL injectors, and crypto-mining software which will run every time the OS starts, also packed in a similar way as the ransomware component, to avoid detection. These will basically attempt to hack other websites, host malicious payloads, and also to perform mining activities to obtain different cryptocurrencies using the victim’s hardware resources.
This is not an ordinary malware. It’s part of a coordinated malware operation, which is, at some level, self-sustainable and also anonymized. This variant of Troldesh/Shade is one of the most sophisticated ransomware we’ve seen lately. The group’s different crypto-currency wallets, at the time of writing this article, exceeded $200.000 in total.
Troldesh/Shade ransomware test results
TEMASOFT Ranstop detects this version of Troldesh/Shade ransomware soon after it starts encrypting files. Upon detection, alerts are fired off, and the malware process is stopped and quarantined. The affected files are automatically restored so that the user doesn’t lose any important information.
About TEMASOFT Ranstop
TEMASOFT Ranstop is an anti-ransomware software that detects present and future ransomware, based on file access pattern analysis with a high degree of accuracy. At the same time, it protects user files so that they can be restored in case of malware attacks or accidental loss.
For more information, follow us on social media and subscribe to our newsletter.