Analytics
2/4/2014
08:04 AM
Tim Wilson
Tim Wilson
Quick Hits
50%
50%

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] isn't malware," Warner writes. "It doesn't actually execute! All Windows EXE files start with the bytes 'MZ.' These files start with 'ZZP.' They aren't 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 you'd like to contact Dark Reading's editors directly, send us a message. Tim Wilson is Editor in Chief and co-founder of Dark Reading.com, UBM Tech's online community for information security professionals. He is responsible for managing the site, assigning and editing content, and writing breaking news stories. Wilson has been recognized as one ... View Full Bio

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Write a Caption, Win a Starbucks Card! Click Here
Latest Comment: This comment is waiting for review by our moderators.
Current Issue
DNS Threats: What Every Enterprise Should Know
Domain Name System exploits could put your data at risk. Here's some advice on how to avoid them.
Flash Poll
Threat Intel Today
Threat Intel Today
The 397 respondents to our new survey buy into using intel to stay ahead of attackers: 85% say threat intelligence plays some role in their IT security strategies, and many of them subscribe to two or more third-party feeds; 10% leverage five or more.
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2013-7445
Published: 2015-10-15
The Direct Rendering Manager (DRM) subsystem in the Linux kernel through 4.x mishandles requests for Graphics Execution Manager (GEM) objects, which allows context-dependent attackers to cause a denial of service (memory consumption) via an application that processes graphics data, as demonstrated b...

CVE-2015-4948
Published: 2015-10-15
netstat in IBM AIX 5.3, 6.1, and 7.1 and VIOS 2.2.x, when a fibre channel adapter is used, allows local users to gain privileges via unspecified vectors.

CVE-2015-5660
Published: 2015-10-15
Cross-site request forgery (CSRF) vulnerability in eXtplorer before 2.1.8 allows remote attackers to hijack the authentication of arbitrary users for requests that execute PHP code.

CVE-2015-6003
Published: 2015-10-15
Directory traversal vulnerability in QNAP QTS before 4.1.4 build 0910 and 4.2.x before 4.2.0 RC2 build 0910, when AFP is enabled, allows remote attackers to read or write to arbitrary files by leveraging access to an OS X (1) user or (2) guest account.

CVE-2015-6333
Published: 2015-10-15
Cisco Application Policy Infrastructure Controller (APIC) 1.1j allows local users to gain privileges via vectors involving addition of an SSH key, aka Bug ID CSCuw46076.

Dark Reading Radio
Archived Dark Reading Radio

The cybersecurity profession struggles to retain women (figures range from 10 to 20 percent). It's particularly worrisome for an industry with a rapidly growing number of vacant positions.

So why does the shortage of women continue to be worse in security than in other IT sectors? How can men in infosec be better allies for women; and how can women be better allies for one another? What is the industry doing to fix the problem -- what's working, and what isn't?

Is this really a problem at all? Are the low numbers simply an indication that women do not want to be in cybersecurity, and is it possible that more women will never want to be in cybersecurity? How many women would we need to see in the industry to declare success?

Join Dark Reading senior editor Sara Peters and guests Angela Knox of Cloudmark, Barrett Sellers of Arbor Networks, Regina Wallace-Jones of Facebook, Steve Christey Coley of MITRE, and Chris Roosenraad of M3AAWG on Wednesday, July 13 at 1 p.m. Eastern Time to discuss all this and more.