An insidious spam botnet attacks Charly
BOT POSSE
While going about his normal duties, Linux Magazine author Charly Kühnast was hit with a mean attack. Charly’s separate anti-spam server, which sits in front of his mail server, saved him from the mail storm.
A sunny Tuesday in July. I’m just typing my Sysadmin column for Linux Magazine. It’s 2.00 pm by the time I take a glance at the monitor that gives me the latest load and traffic data for the critical servers I manage. Lo and behold, the reject line in the spam filter graph has just skyrocketed (See Figure 1). The article will have to wait. The server is rejecting large quantities of mail at an early stage of the SMTP dialog. I suspect a wave of spam with clumsily spoofed envelopes. That’s nothing new: for each legitimate email I receive, I get at least two spam mails. But I still decide to open an SSH connection to the spam filter, which is running on a separate machine, and I can’t believe my eyes when I discover 140 parallel SMTP connections. That’s ten times the normal level. And it’s unusual for the server just to drop the connections like that.
Buy this article as PDF
(incl. VAT)
Buy Linux Magazine
US / Canada
UK / Australia
News
-
ExTiX 22.9 Released with Support for Installing Android Apps
The developers of the ExTiX Linux Distribution have released a new version that includes added support to make installing and using Android apps on the desktop a breeze.
-
System76 Skips Pop!_OS 22.10 to Focus on COSMIC Desktop
In a move that is sure to raise some eyebrows, System76 has chosen to concentrate on COSMIC Desktop instead of staying in step with Ubuntu releases.
-
New Look for System76 Thelio
System76 has given their already stellar Thelio desktop computer a redesign by way of the chassis accent panel.
-
Ubuntu Software Store Rumored to Replace Gnome Software
An alternative to GNOME Software has been written, using Flutter, and it’s making enough noise that Canonical is rumored to be considering using it as the default.
-
A New Arch-Based Linux Distribution Has Arrived
Crystal Linux is a new distribution with the goal of bringing the power of Arch Linux to the masses.
-
Fedora 37 Beta Available
The Fedora development team announced the beta for version 37 of the open-source operating system would be released on time on September 13, 2022.
-
Salix 15.0 Offers Updates and a Modernized Look
Salix is a Slackware-based Linux distribution with a new look and a goal of being fast, user-friendly, and highly stable.
-
Ubuntu 20.04.5 LTS Release Now Available
The latest point release of the Ubuntu 20.04 LTS distribution is now available and sports kernel 5.15.
-
MX Linux 21.2 Offers Improvements and Bug Fixes
MX Linux 21.2, aka “Wildflower,” is now officially available and is the second refresh of the MX-21 release.
-
Gnome Project Releases New Telemetry Data Collection Tool
The GNOME developers have announced the release of a new tool to collect anonymous information about your system.