Lately, my honeypot has seen an upsurge in SSH bruteforce login attempts. Among quite a few attackers, one particular IP address in Italy – 79.0.43.89 – is seen more often than the others. I’m seeing login attempts from this IP on other systems as well, so this is a busy one. What’s funny about this […]
Building upon a sysadvent article I wrote at work, I’ve set up a dedicated Response Policy Zone using the freely available data files from the Malware Domain Blocklist. There are different ways to do this, but for this particular purpose I’ve imported the text file and generated a single zone file locally. BIND supports up […]
In the continuing quest to install security software on Raspberry Pis, testing their capacity to be used as small nodes that can be placed here and there on demand, the time has come for installing Bro. The hardware/OS in question is a Raspberry Pi 2, with 1G RAM and 4 CPU cores. It’s running the […]
After running a small SSH-only honeypot for a week or so, I’m a bit surprised with the complexity of some of the attempted passwords. The passwords that are most frequently attempted are quite simple, as shown in the top 5 passwords for the root account: root [no password] 123456 synopass !Q@W#E These are less obvious: […]
Did you ever wonder where your network traffic goes (and originates from)? With the SiLK suite and optionally some JavaScript map classes it’s quite easy to find out. SiLK is a tool quite equal to Cisco‘s NetFlow, and SiLK does indeed accept NetFlow output from a router. Just like NetFlow tools, SiLK stores network traffic […]
Inspired by the efforts of a previous Redpill Linpro colleague, Espen Grøndahl, I’ve revived (or rather re-invented) his project “Fireplot”. By analyzing and filtering firewall logs, Fireplot graphs attempts to access blocked firewall ports, visualizing unexpected and unwanted activity towards my network. The Y axis is logarithmic, since activity towards lower ports is often more […]
In an earlier article, I described how to stream captured network traffic to a remote host for IDS analysis with Snort. Mikrotik units can stream captured traffic elsewhere using the TaZmen Sniffer Protocol (TZSP). tcpdump and Wireshark natively decode this protocol, but unfortunately it doesn’t seem to be supported by any other of the large […]
Our three kids very seldom agree which TV program or movie to watch. Allowing for less discussion when screen time is granted, I’ve set up a mobile entertainment center where each kid may watch the movie of their choice – this may be used during long drives, on trains or buses, and everywhere else where […]
For those still inclined to use kermit for serial console access, these are the commands for connecting to a MikroTik CRS125 with default settings: # kermit C-Kermit 8.0.211, 10 Apr 2004, for Linux Copyright (C) 1985, 2004, Trustees of Columbia University in the City of New York. Type ? or HELP for help. (/root/) C-Kermit>set […]
UPDATE: For more flexible streaming, and for not having to hack your Snort init scripts, you might want to consider this article as well. Now back to the scheduled program. Port mirroring on a strategically positioned switch can be the best setup for an IDS sensor. If that’s not an option, RouterOS-based MikroTik devices support […]