Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Attacks/Breaches

12/19/2012
04:40 PM
Connect Directly
Twitter
RSS
E-Mail
50%
50%

New Apache Server Attack Discovered

Exploit ultimately leads to theft of online banking credentials via Zeus variant

One of the most popular Web server platforms is now serving up malware in an attack that ultimately aims to steal online banking credentials.

A new Apache exploit discovered and analyzed by Eset injects malware into Web pages on a Web server. The so-called Linux/Chapro.A variant has multiple features to camouflage its presence, and basically "tricks" the unsuspecting Apache software into infecting a visitor's machine, according to Eset's findings.

The malware injects an iFrame onto the server that ultimately leads to the installation of Zeus variant Win32/Zbot. It also links to the so-called Sweet Orange exploit kit landing page, out of Lithuania.

"More than half of all web servers on the Internet use Apache, so when we discovered a malicious Apache module in the wild last month, being used to inject malicious content into web pages displayed by compromised web servers, we were understandably concerned," says Pierre-Marc Bureau, security intelligence program manager at Eset, in a blog posting on the malware.

Linux/Chapro.A injects iFrames by sending an HTTP POST request to its command-and-control server every 10 minutes.

The malware pushes a pop-up message to the banking customer asking for a bank card CVV code: If the user falls for it and provides it, that information as well as banking credentials go to the bad guys.

Just how it all starts is still unclear. "This is a malicious module installed on an otherwise non-malicious server. This implies the controls protecting server access were circumvented or there is an insider involved. However, we also need to consider the module could have been part of a corrupted Linux distribution or application package," Bureau told Dark Reading.

He says Eset doesn't know how the module got onto the server to begin with: "Could be a weak password, vulnerable Web application, etc. The user needs high privileges to load the module so, he most probably had root on the machine," Bureau says.

"We don't know who is spreading this but probably a gang specializing in such attacks, then renting 'traffic' to other groups," he says.

The attack employs multiple stealth modes to mask it from website operators, including checking for known bots and active SSH systems. "If a visitor browses a page using any of the same IPs involved in a SSH connection, it will not be served the malicious content. This helps hide the malicious content from system administrators, Web developers, and others who might be working on the Web server," Bureau says.

Linux/Chapro.A also places a cookie in the visitor's browser before the malware injects the iFrame into the Web content. "Malicious content will not be served if the visiting browser already had that cookie set. This helps ensure that visitors will not receive malicious content over and over again, making it more difficult to determine how a system was infected," he says. And the malware ensures that it only infects a victim once by keeping a list of IP addresses it has infected.

The malware's command-and-control server was hosted in Germany, but since has gone offline.

"This complicated case spreads across three different countries, targeting users from a fourth one, making it very hard for law enforcement agencies to investigate and mitigate," Bureau blogged. "It is not clear at this point in time if the same group of people are behind the whole operation, or if multiple gangs collaborated, perhaps with one to drive traffic to the exploit pack and sell the infected computers to another gang operating a botnet based on Win32/Zbot."

The full Eset blog post is here.

Have a comment on this story? Please click "Add Your Comment" below. If you'd like to contact Dark Reading's editors directly, send us a message.

Kelly Jackson Higgins is the Executive Editor of Dark Reading. She is an award-winning veteran technology and business journalist with more than two decades of experience in reporting and editing for various publications, including Network Computing, Secure Enterprise ... View Full Bio

Comment  | 
Print  | 
More Insights
Comments
Threaded  |  Newest First  |  Oldest First
Edge-DRsplash-10-edge-articles
I Smell a RAT! New Cybersecurity Threats for the Crypto Industry
David Trepp, Partner, IT Assurance with accounting and advisory firm BPM LLP,  7/9/2021
News
Attacks on Kaseya Servers Led to Ransomware in Less Than 2 Hours
Robert Lemos, Contributing Writer,  7/7/2021
Commentary
It's in the Game (but It Shouldn't Be)
Tal Memran, Cybersecurity Expert, CYE,  7/9/2021
Register for Dark Reading Newsletters
White Papers
Video
Cartoon
Current Issue
The State of Cybersecurity Incident Response
In this report learn how enterprises are building their incident response teams and processes, how they research potential compromises, how they respond to new breaches, and what tools and processes they use to remediate problems and improve their cyber defenses for the future.
Flash Poll
How Enterprises are Developing Secure Applications
How Enterprises are Developing Secure Applications
Recent breaches of third-party apps are driving many organizations to think harder about the security of their off-the-shelf software as they continue to move left in secure software development practices.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2021-27491
PUBLISHED: 2021-07-30
Ypsomed mylife Cloud, mylife Mobile Application:Ypsomed mylife Cloud,All versions prior to 1.7.2,Ypsomed mylife App,All versions prior to 1.7.5,The Ypsomed mylife Cloud discloses password hashes during the registration process.
CVE-2021-27495
PUBLISHED: 2021-07-30
Ypsomed mylife Cloud, mylife Mobile Application:Ypsomed mylife Cloud,All versions prior to 1.7.2,Ypsomed mylife App,All versions prior to 1.7.5,he Ypsomed mylife Cloud reflects the user password during the login process after redirecting the user from a HTTPS endpoint to a HTTP endpoint.
CVE-2021-32807
PUBLISHED: 2021-07-30
The module `AccessControl` defines security policies for Python code used in restricted code within Zope applications. Restricted code is any code that resides in Zope's object database, such as the contents of `Script (Python)` objects. The policies defined in `AccessControl` severely restrict acce...
CVE-2021-22521
PUBLISHED: 2021-07-30
A privileged escalation vulnerability has been identified in Micro Focus ZENworks Configuration Management, affecting version 2020 Update 1 and all prior versions. The vulnerability could be exploited to gain unauthorized system privileges.
CVE-2021-34629
PUBLISHED: 2021-07-30
The SendGrid WordPress plugin is vulnerable to authorization bypass via the get_ajax_statistics function found in the ~/lib/class-sendgrid-statistics.php file which allows authenticated users to export statistic for a WordPress multi-site main site, in versions up to and including 1.11.8.