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Brute Force Attack

Discussion in 'Security' started by bluerayconcepts, Jun 24, 2014.

  1. bluerayconcepts

    bluerayconcepts Active Member

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    So this morning I starting getting a myriad of email alert fro CSF about blocked IP's. I am use to seeing the IP blocked for yada yada every so often but this morning it started in earnest.

    CSF is doing its job blocking the IP's after 5 failed attempts but I have never seen this many come in before. Every email is showing the same thing just with different IP and different host name.

    2014-06-24 13:29:25 [25199] dovecot_plain authenticator failed for (JAVIER-RRR) [190.147.132.98]:52839 I=[xx.xx.xx.xx]:25: 535 Incorrect authentication data (set_id=richard)
    2014-06-24 13:29:31 [25199] dovecot_login authenticator failed for (JAVIER-RRR) [190.147.132.98]:52839 I=[xx.xx.xx.xx]:25: 535 Incorrect authentication data (set_id=richard)
    2014-06-24 13:29:38 [25274] dovecot_plain authenticator failed for (JAVIER-RRR) [190.147.132.98]:52896 I=[xx.xx.xx.xx]:25: 535 Incorrect authentication data (set_id=richard@mail.xx.xx)
    2014-06-24 13:29:48 [25274] dovecot_login authenticator failed for (JAVIER-RRR) [190.147.132.98]:52896 I=[xx.xx.xx.xx]:25: 535 Incorrect authentication data (set_id=richard@mail.xx.xx)
    2014-06-24 13:58:25 [4921] dovecot_plain authenticator failed for (JAVIER-RRR) [190.147.132.98]:63786 I=[xx.xx.xx.xx]:25: 535 Incorrect authentication data (set_id=richard)

    My question is as this has been going on for the last 4 hours or so, what else should I do at this point.
     
  2. quizknows

    quizknows Well-Known Member

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    If your server is otherwise operating as normal, there's not much you can do. Maybe increase the deny IP limit in CSF conf for a while. The attack should go away eventually.
     
  3. bluerayconcepts

    bluerayconcepts Active Member

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    Looks like it just did finish. Server was fine, no extra load, just lots of denied ip's, more than usual.

    I called the customer whose id was being used and made sure they were aware of it, and suggested they run malware and virus scan on their computers just as a precaution.

    I have read lots of info on the brute force botnet style attacks, none of it really says what to do other than what I already have done, so I can at least take comfort in that. I guess I was more curious if there was some authority to submit info to to help them track this kind of stuff down or if it would even be worth it.

    Thanks
     
  4. SS-Maddy

    SS-Maddy Well-Known Member

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    There is nothing more can be done from your side. It could be a compromised machine trying to access the mails.
     
  5. cPanelMichael

    cPanelMichael Forums Analyst
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    Hello :)

    Yes, there's not much you can do to prevent the brute force attempt itself, so blocking the IP addresses is really the main step to take in cases like this.

    Thank you.
     
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