Skip to main content

Snort:Intrusion Detection System

Snort is a lightweight intrusion detection system that can log packets coming across your network. This
program can be used on smaller networks but on larger ones, with Gigabit Ethernet, snort can become
unreliable. Snort doesn't require that you recompile your kernel or add any software or hardware to your
existing distribution but it does require that you have root privileges.

Now we'll take a look at some basic rules to see how they work. The basic format of a rule is as follows:
function protocol source_ip/mask source_port -> destination_ip/mask destination_port options
A rules file will contain many lines of rules and it can look a little complicated at first. Here’s an example.
# look for stealth port scans/sweeps
alert tcp any any -> $HOME_NET any (msg:"SYN FIN Scan"; flags: SF;)
alert tcp any any -> $HOME_NET any (msg:"FIN Scan"; flags: F;)
alert tcp any any -> $HOME_NET any (msg:"NULL Scan"; flags: 0;)
alert tcp any any -> $HOME_NET any (msg:"XMAS Scan"; flags: FPU;)
alert tcp any any -> $HOME_NET any (msg:"Full XMAS Scan"; flags: SRAFPU;)
alert tcp any any -> $HOME_NET any (msg:"URG Scan"; flags: U;)
alert tcp any any -> $HOME_NET any (msg:"URG FIN Scan"; flags: FU;)
alert tcp any any -> $HOME_NET any (msg:"PUSH FIN Scan"; flags: FP;)
alert tcp any any -> $HOME_NET any (msg:"URG PUSH Scan"; flags: PU;)
alert tcp any any -> $HOME_NET any (flags: A; ack: 0; msg:"NMAP TCP ping!";)
# IMAP buffer overflow
alert tcp any any -> $HOME_NET 143 (msg:"IMAP Buffer Overflow!"; content:"|E8C0FF FFFF|"; flags: PA;)
# x86 named buffer overflow
alert tcp any any -> $HOME_NET 53 (msg:"named Buffer Overflow!"; content:"|CD80E8D7 FFFF FF|"; flags: PA;)

Now lets try to make our own rule and test it out....

Step1: Making rule:

Step2: Now run snort with this rule and try to telnet to this machine to generate alert messages.

You can use many options with snort to get better console display.To check out other option just type snort --help in terminal.

check out the log directory which we have defined with -l option.


Popular posts from this blog

Install Virtual Box On Kali Rolling

If you facing problem with virtualbox installation on kali rolling edition because of its outdated kernel 4.3.0-kali1-amd64 then this post is for you only.

Step1: Install latest kernel. First search the cache for list of available ones apt-cache search linux-headers
Depending upon the list choose one from the set and install install it.
you can download kernel file using wget from ubuntu source also.
for more refer to this post: link

Edit the boot entry /boot/vmlinuz-(New Linux kernel Version) & /boot/initrd.img-(New Linux kernel version) in grub menu.

Before making boot entry changes be sure these files exist in the /boot directory after running install command.
In my case following new file got created in /boot folder:


Thats all you need to do to install any virtual software on kali r…

Hacking Windows 10 UWP App: DLL Injection & common Vulnerabilities

I recently started working on  widows 10 Apps( Apps not Applications) security. Before diving deep in hacking terms lets try to understand what's new in Windows 10 UWP( Universal Platform) as compared to old Apps. Lets begin with how apps actually work on windows 10(desktop/tablet). Now windows 10 comes with a container only for running apps inside the isolated environment. By default, /APPCONTAINER(Linker Flag) is off. This option modifies an executable to indicate whether the app must be run in the appcontainer process-isolation environment. Specify /APPCONTAINER for an app that must run in the appcontainer environment—for example, a Windows Store app. (The option is set automatically in Visual Studio when you create a Windows Store app from a template.) For a desktop app, specify /APPCONTAINER:NO or just omit the option. The /APPCONTAINER option was introduced in Windows 8.
Now there is no registry entry concept for these app in the System HIVE rather they install they own hiv…

Assignment 01(Enroll TO Offensive-Security Course)

Steps 1:download the page.
2:open fc4.js in your favourite editor and add following lines in it or just replace it with vode given below.
3:then open the download html file in browser and fill the form with your email and a garbage value string.
4:thats it? it will show you the real security string??
yeah but  ...theirs another challenge waiting for you ... :D

function fc4me(srvstr) {

   if(! || !document.pleazfc4me.securitystring.value) {
      alert("Please fill in all the required fields!");
      return false;
   else {
   var t=hexMD5("\x74\x72\x79\x68\x61\x72\x64\x65\x72"+srvstr)

Finally Got In :-)