WannaCry Analysis
Table of Contents
Malware Analysis - This article is part of a series.
Introduction: #
WannaCry is a ransomware attack that affected computer systems across the globe in May 2017. It spread through a worm-like mechanism, infecting vulnerable systems that had not applied the latest security updates. WannaCry encrypts user files and demands payment in exchange for the decryption key. In this report, we will analyze the technical aspects of the WannaCry ransomware and its propagation mechanism.
Propagation Mechanism: #
WannaCry uses the EternalBlue exploit, which targets a vulnerability in the SMBv1 protocol used by Windows systems. The exploit takes advantage of a buffer overflow in the implementation of the protocol, allowing remote code execution. Once a system is infected, WannaCry uses a worm-like mechanism to spread to other vulnerable systems on the same network. It does this by scanning for open SMB ports and attempting to exploit the vulnerability.
Technical Analysis: #
The WannaCry ransomware is written in the programming language C++. It uses a customized implementation of the Microsoft Cryptographic Application Programming Interface (CryptoAPI) to generate and manage encryption keys. The malware uses the RSA-2048 algorithm to encrypt user files, appending the .WCRY file extension to each encrypted file. The ransom note is displayed as a pop-up window, which contains instructions on how to pay the ransom in Bitcoin to get the decryption key.
WannaCry has two components: a worm component and a ransomware component. The worm component is responsible for spreading the infection to other systems on the same network. It scans for open SMB ports and sends the exploit code to vulnerable systems. The ransomware component is responsible for encrypting user files and displaying the ransom note.
Prevention and Mitigation: #
To prevent infection, it is recommended to keep operating systems and software up to date with the latest security patches. It is also advised to disable SMBv1 protocol on all systems, as this protocol is no longer secure and has several known vulnerabilities. Organizations can also deploy security solutions, such as intrusion detection systems (IDS) and firewalls, to prevent the spread of the ransomware.
Conclusion: #
WannaCry ransomware attack was a global cybersecurity incident that caused significant damage to businesses and individuals. The ransomware used the EternalBlue exploit to infect vulnerable systems and spread like a worm. The malware encrypted user files using the RSA-2048 algorithm and demanded payment in Bitcoin. To prevent future attacks, it is crucial to keep software up to date, disable outdated protocols, and deploy security solutions.