Dedicated Server - Windows Server 2008 Standard. Been told it is sending syn floods

Discussion in 'Malware Help - MG (A Specialist Will Reply)' started by PHinett, Jun 8, 2011.

  1. PHinett

    PHinett Private E-2

    Hi,

    I'm not sure if this is the correct place to ask for a help in hand here, but i'm having trouble tracking down the source of a problem. My dedicated server provider has informed me that 1 of my servers has been sending syn flood attacks to another one of my servers connected to the same router and has unplugged the network cable on it for now as a precaution.

    I can still remote desktop to the machine to work on it though.

    Here is what they sent me:
    This was a flood of traffic between the following two IPs 174.*.*.218,
    174.*.*.219 Mainly traffic from 174.*.*.218 to the 174.*.*.219. All
    4096 packets, that are the limit for a capture on the router, were strictly
    traffic to and from these two IPs, and mainly traffic from 174.*.*.218 to the
    .219 IP. This traffic was causing the CPU on the router to spike, thus causing
    packetloss on the device.

    It would appear that the 174.*.*.218 server was
    performing a syn attack to the server 174.*.*.219. As this traffic was
    originating from a host on this router to another host on this router. Cisco
    Guard would not have mitigated this issue.

    ---

    Now I have done some tests with netstat -o to try and find any rouge applications but everything seems normal to me, I have done a scan with Avast server edition and also MalwareBytes to see if anything could be picked up but both came back clean.

    Has anyone got any advice?

    Paul
     
    PHinett, Jun 8, 2011
    #1
  2. Kestrel13!

    Kestrel13! Super Malware Fighter - Major Dilemma Staff Member

    Re: Dedicated Server - Windows Server 2008 Standard. Been told it is sending syn floo

    Welcome to Major Geeks!

    Please read ALL of this message including the notes before doing anything.

    Please follow the instructions in the below link:

    READ & RUN ME FIRST. Malware Removal Guide


    and attach the requested logs when you finish these instructions.
    • **** If something does not run, write down the info to explain to us later but keep on going. ****
    • Do not assume that because one step does not work that they all will not. MGtools will frequently run even when all other tools will not.

    • After completing the READ & RUN ME and attaching your logs, make sure that you tell us what problems still remain ( if any still do )!
    Helpful Notes:

    1. If you run into problems trying to run the READ & RUN ME or any of the scans in normal boot mode, you can run the steps in safe boot mode but make sure you tell us what you did later when you post logs. See the below if you do not know how to boot in safe mode:
    2. If you have problems downloading on the problem PC, download the tools and the manual updates for SUPERAntiSpyware and Malwarebytes ( links are given in the READ & RUN ME) onto another PC and then burn to a CD. Then copy them to the problem PC. You will have to skip getting updates if (and only if) your internet connection does not work. Yes you could use a flash drive too but flash drives are writeable and infections can spread to them.
    3. If you cannot seem to login to an infected user account, try using a different user account (if you have one) in either normal or safe boot mode and running only SUPERAntiSpyware and Malwarebytes while logged into this other user account. Then reboot and see if you can log into the problem user account. If you can then run SUPERAntiSpyware, Malwarebytes, ComboFix and MGtools on the infected account as requested in the instructions.
    4. To avoid additional delay in getting a response, it is strongly advised that after completing the READ & RUN ME you also read this sticky:
    Any additional post is a bump which will add more delay. Once you attach the logs, your thread will be in the work queue and as stated our system works the oldest threads FIRST.
    ​
     
    Kestrel13!, Jun 8, 2011
    #2
  3. PHinett

    PHinett Private E-2

    Re: Dedicated Server - Windows Server 2008 Standard. Been told it is sending syn floo

    Here are my 2 log files from SuperAntiSpyware + MalwareBytes attached.

    MGTools log coming up next.
     

    Attached Files:

    PHinett, Jun 9, 2011
    #3
  4. PHinett

    PHinett Private E-2

    Re: Dedicated Server - Windows Server 2008 Standard. Been told it is sending syn floo

    MGTools log files zipped.

    These are the only applications I could run due to my O/S being windows server 2008 x64.

    Paul
     

    Attached Files:

    PHinett, Jun 9, 2011
    #4
  5. Kestrel13!

    Kestrel13! Super Malware Fighter - Major Dilemma Staff Member

    Re: Dedicated Server - Windows Server 2008 Standard. Been told it is sending syn floo

    Download Cleano 0.61

    Download it to your desktop, Right click the cleano.exe file and run as admin > and place check marks in the boxes as follows

    [​IMG]

    Click clean now and exit the program.

    I am seeing alot of strange DLL's in a temp location. Other than that, not seeing anything like malware.

    How are things running after clearing out temps? :confused
     
    Kestrel13!, Jun 9, 2011
    #5
  6. PHinett

    PHinett Private E-2

    Re: Dedicated Server - Windows Server 2008 Standard. Been told it is sending syn floo

    Hi,

    Thanks for your help, I have ran the Cleano software ok.

    I am too a little confused about this situation...I can't really tell if the problem has been rectified yet...I have emailed my datacenter to see if they can bring the server back online and to keep an eye on it for me.

    I will keep this thread open until I here back from them.

    Paul
     
    PHinett, Jun 9, 2011
    #6
  7. Kestrel13!

    Kestrel13! Super Malware Fighter - Major Dilemma Staff Member

    Re: Dedicated Server - Windows Server 2008 Standard. Been told it is sending syn floo

    Yes of course, the thread will remain open. Let me know how you get on. :)
     
    Kestrel13!, Jun 9, 2011
    #7

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