McAfee Labs

Free Ransomware Available on Dark Web

The McAfee Advanced Threat Research team recently analyzed a ransomware-as-a-service threat that is available for free and without registration. This malware was first seen in July 2017 with the extension .shifr. It has now appeared in recent detections with the extension .cypher. Ransomware-as-a-Service Ransomware-as-a-service is a cybercrime economic model that allows malware developers to earn money …

McAfee Labs

Stopping Malware With a Fake Virtual Machine

As we explained in a previous post, some advanced malware can detect a virtual environment such as a sandbox to avoid detection and analysis. Some threats can also detect monitoring tools used for malware analysis. Often such malware will not execute or change their behavior to appear harmless. Because some malware uses these tactics, planting …

McAfee Labs

An Overview of Malware Self-Defense and Protection

Many malware authors spend a great deal of time and effort to develop complex code. Their success depends on a threat’s remaining undetected and avoiding sandbox analysis, antivirus efforts, or malware analysts. This post offers an overview of the mechanisms used by malware to evade detection. If malware is detected quickly, it has little time …

McAfee Labs

Zcrypt Expands Reach as ‘Virus Ransomware’

Intel Security has recently seen a new kind of ransomware–Zcrypt—that can self-replicate. This “virus ransomware” arrives via email in a malicious attachment or by usurping an Adobe Flash Player installation. The malware copies itself onto removable drives to infect other machines. Zcrypt uses the Nullsoft Scriptable Install System, which works like a Zip file, decompressing …