A julgar pela velocidade com que novas iterações são introduzidos no selvagem, quem está por trás do ransomware GandCrab não vai parar tão cedo. O ransomware foi apenas atualizado em duas novas versões – GANDCRAB v5.0.1 and GANDCRAB v5.0.2 that are currently being deployed against victims worldwide.
CVE-2018-0896 Used in Latest GandCrab Ransomware Campaigns
Security researchers were able to uncover that the ransomware operators are using several known vulnerabilities, including the Fallout exploit kit which was also used in September 2018 campanhas. This EK was unearthed by security researcher nao_sec at the end of August 2018 and is once again part of the operators’ distribution arsenal.
As for the vulnerabilities, it appears that GandCrab operators are increasingly using CVE-2018-0896 which is known as a “Windows Kernel Information Disclosure Vulnerability”. Here’s its official descrição:
The Windows kernel in Microsoft Windows Server 2008 SP2 e R2 SP1, janelas 7 SP1, janelas 8.1 and RT 8.1, Windows Server 2012 e R2, janelas 10 Ouro, 1511, 1607, 1703, e 1709, Windows Server 2016 e Windows Server, versão 1709 allows an information disclosure vulnerability due to the way memory addresses are handled, aka “Windows Kernel Information Disclosure Vulnerability”.
Analysis by 360 Total Security researchers also revela that the ransomware is commonly distributed via the following technique:
- Software bundlers, or presenting itself as normal software in download sites;
- By cracking weak passwords;
- By using the Apache Tomcat exploit;
- By using Jboss and WebLogic server flaws;
- By using Struts vulnerabilities.
GandCrab September campaigns were extensively relying on the Fallout EK. The EK was being installed on compromised websites and was attempting to exploit vulnerabilities present in the potential victim’s system. The EK was detected exploiting two known exploits – one for Adobe Flash Player (CVE-2018-4878) and one for the Windows VBScript engine (CVE-2018-8174).