Mumblehard Malware

Mumblehard is a strain of malware that primarily targets web servers running Linux and BSD operating systems and surreptitiously uses the infected systems as spamming bots.

The security firm ESET discovered the Mumblehard malware in April 2015, but there is evidence of the malware remaining under the radar for at least the past five years. ESET gave the malware the Mumblehard moniker because it “mutters spam from your servers,” according to the security research firm.

How Mumblehard Works and How to Prevent It from Starting

The Mumblehard malware exploits vulnerabilities in WordPress and Joomla to execute two components written in Perl. The first component is a backdoor that requests commands from the malware’s command and control server, and the second is a spammer daemon that can be launched via a command received by the backdoor.

In addition to exploiting vulnerabilities in WordPress and Joomla, the Mumblehard malware can also be installed through the distribution and installation of backdoored “pirated” versions of a Linux and BSD program called DirectMailer, which is a software tool used for sending out e-mails in bulk.

The Mumblehard malware backdoor is typically installed in the /tmp or /var/tmp directories, and ESET recommends mounting these directories with the noexec option to prevent the Mumblehard backdoor from being able to start. Those concerned with whether Mumblehard is already installed on a server should first look for unsolicited cronjob entries for all users on the server(s) suspected of being infected.

Forrest Stroud
Forrest Stroud
Forrest is an experienced, entrepreneurial and well-rounded professional with 15+ years covering technology, business software, website design, programming and more.

Top Articles

The Complete List of 1500+ Common Text Abbreviations & Acronyms

UPDATED: This article was updated April 6, 2021 by Web Webster   From A3 to ZZZ we list 1,559 text message and online chat abbreviations to...

How to Create a Website Shortcut on Your Desktop

UPDATED: This article was updated April 6, 2021 by Web Webster   This Webopedia guide will show you how to create a desktop shortcut to a...

Windows Operating System History & Versions

The Windows operating system (Windows OS) refers to a family of operating systems developed by Microsoft Corporation. We look at the history of Windows...

What are the 5 Generations of Computers?

UPDATED: This article was updated on April 6, 2021 by Web Webster   Learn about each of the 5 generations of computers and major technology developments...

Random Access Memory (RAM)...

UPDATED: This article Updated April 6, 2021 by Web Webster   Random Access Memory (RAM)...

OEM – original equipment...

UPDATED: This article was updated April 6, 2021 by Web Webster OEM (pronounced as...

Best ERP Software for...

UPDATED: This page was updated April 6, 2021 by Web Webster   Enterprise resource planning...