Results for Floser Bacurio and Roland Dela Paz

Threat Research

Cracking Locky’s New Anti-Sandbox Technique

The last few weeks saw new variants of the Locky ransomware that employs a new anti-sandbox technique. In these new variants, Locky’s loader code uses a seed parameter from its JavaScript downloader in order to decrypt embedded malicious code and execute it properly. For example, the downloaded Locky executable is executed by the JavaScript in the following manner: sample.exe 123 Below is a screenshot of it in action: This new trick may pose challenges for automated Locky tracking systems that utilize sandboxing due to the following...