GameOver Zeus Authors Try A New Tactic: Encryption

Authors of malicious GameOver Zeus exploit dodge detection with new encryption scheme

The authors of the GameOver Zeus malware are taking a new approach to avoiding detection: encryption.
According to a
blog posted Sunday
by researchers at Malcovery Security, the new approach could enable the malware to escape conventional security defenses.
Gary Warner, co-founder and CTO at Malcovery, writes that GameOver Zeus authors are encrypting their EXE file so that as it passes through your firewall, Web filters, network intrusion detection systems, and any other defenses you may have in place, it is doing so as a non-executable .ENC file.
While antivirus tools and other products have recently improved their ability to detect and block the dangerous Zeus variant, the encrypted attack was not detected by any of the 50 products used by VirusTotal, according to the blog.
Why? Well, because technically, [the encrypted ENC file] isnt malware, Warner writes. It doesnt actually execute! All Windows EXE files start with the bytes MZ. These files start with ZZP. They arent executable, so how could they be malware? Except they are.
In the blog, Warner gives many examples that show how the campaign works and how the malware is delivered. He also offers a bit of advice.
If you are in charge of network security for your enterprise, you may want to check your logs to see how many .ENC files have been downloaded recently, the blog warns.
Have a comment on this story? Please click Add a Comment below. If youd like to contact
Dark Readings
editors directly,
send us a message
.

Last News
▸ DHS-funded SWAMP scans code for bugs. ◂ Discovered: 23/12/2024 Category: security	▸ Debunking Machine Learning in Security. ◂ Discovered: 23/12/2024 Category: security	▸ Researchers create BlackForest to gather, link threat data. ◂ Discovered: 23/12/2024 Category: security

**Cyber Security Categories**
Google Dorks Database	Exploits Vulnerability	Exploit Shellcodes

CVE List

Tools/Apps

News/Aarticles

Phishing Database

Deepfake Detection

Trends/Statistics & Live Infos

Tags:
GameOver Zeus Authors Try A New Tactic: Encryption