As Tinkster said, there are tools like rkhunter and chkrootkit, but these are not usually the best place to start. LQ Sec can definitely help you to determine if your system has been compromised by guiding you through an investigation of the situation. The investigation process focuses on diagnostics to gain facts and clues regarding the state of the system. Like with hunting for ghosts, we sometimes find rational explanations for seemingly compromise behavior and other times we get real evidence of a compromise.
As Tinkster pointed out the first step is to take the machine off line. It is best to do this by either disconnecting the network cable or putting up a firewall (iptables) to only allow SSH connections from a trusted source. Once you have secured the machine you can work with much less possibility of interference. The next step would be to review the CERT intruder detection checklist. It will give you an overview of the investigation process. Don't worry if a lot of it doesn't make sense, we can help with that.
Now, to begin, would you please describe what is happening that leads you to suspect that your machine may have been compromised? Please provide as much specific detail as possible, including log entries if you have them.
As Tinkster pointed out the first step is to take the machine off line. It is best to do this by either disconnecting the network cable or putting up a firewall (iptables) to only allow SSH connections from a trusted source. Once you have secured the machine you can work with much less possibility of interference. The next step would be to review the CERT intruder detection checklist. It will give you an overview of the investigation process. Don't worry if a lot of it doesn't make sense, we can help with that.
Now, to begin, would you please describe what is happening that leads you to suspect that your machine may have been compromised? Please provide as much specific detail as possible, including log entries if you have them.
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- How to block Little Snitch from calling home and killing numbers:
- 1. The first step is to block Little Snitch with Little Snitch. Create two new rules in Little Snitch as below:
- a) Deny connections to Server Hostname http://www.obdev.at in LS Configuration. The address that will appear if you do it correctly is 80.237.144.65. Save.
- and the next is:
- b) Deny connections in LS Config to the application Little Snitch UIAgent (navigate to /Library/Little Snitch/Little Snitch UIAgent.app, any server, any port.
- 2. After that is done, open the Terminal (in your Utilities) and paste in:
- sudo /Applications/TextEdit.app/Contents/MacOS/TextEdit /etc/hosts
- (Hit return and type in your admin password). A TextEdit window will open behind the Terminal window. Command+Tab to it - this is your hosts file.
- 3. Place your cursor at the end of the text there, type or leave one vertical space and paste in the following:
- # Block Little Snitch
- 4. Close TextEdit, hit Command+Tab to return to the Terminal window, and paste in the following:
- sudo dscacheutil -flushcache
- 5. Hit the Return key and quit Terminal. You're finished now.
- 6. Easy, isn't it. If only everyone would do this, the developer would cease and desist from killing the number that you personally are using successfully on your Mac. At least until the next version is released…
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Dec 16, 2007 Anonymous wrote:I just installed Little Snitch (after having used it in the past) and I had 'racoon' pop up with a UDP connection to port 32788. Mar 11, 2010 I have recently installed little snitch, later i prefer to uninstall that, because, whenever i open any application, immediately one notification window.