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Couple of machines potentially sending spam. Which of them are still infected?


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#1 Skyline969

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Posted 24 April 2013 - 03:48 PM

Hello. I work at an ISP and, to my shock, noticed that there was spam being sent from an IP that was in use by someone I knew. They got blacklisted, cutting off their ability to send spam, and I contacted them and went to work. In Safe Mode I ran scans with the latest version of Malwarebytes' Anti-Malware, on both machines this returned clean. Now, I am relatively new to ComboFix, but I ran it on both machines. After looking at the documentation here I realized that this is not the best practice, but it's too late to undo it. Both machines rebooted back to Windows just fine. After realizing that I must use DDS to get a log file to post here, I ran it on both of their machines (not in safe mode at this point). The logs are attached, I have appended a letter to each of them to help determine which computer is which.

 

Note that I have already ran a scan with Malwarebytes' Anti-Malware and ComboFix in safe mode prior to running DDS. MBAM returned clean for both computers. I have the scan logs for both computers from ComboFix should you need them.

 

If someone could help me out in determining if the machines are still infected, I would greatly appreciate it. I apologize for not completely following protocol, but I was unaware of it prior to looking up when I was going to post here for help.

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#2 HelpBot

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Posted 29 April 2013 - 03:50 PM

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#3 Skyline969

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Posted 30 April 2013 - 09:38 AM

Currently, I am still unsure of whether or not these machines are infected after performing a removal myself. I am not able to produce a new DDS log since I do not have physical access to the machines, but I know for certain that they have not seen much use since my original post. However, I can provide as much information as you may need.

 

PC #1 (W):

Windows 7 Professional x64

 

PC #2 (E):

Windows 7 Ultimate x86

 

I have the Windows discs for both of these computers, and if need be I can get physical access to them (involves a 4 hour drive which I'd rather not make unless absolutely necessary).

 

If you require any more information, please do not hesitate to ask and I will get it to you ASAP.



#4 Elise

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Posted 01 May 2013 - 03:53 PM

Hello, my name is Elise and I'll assist you with this issue.

We try always to avoid working on multiple machines in one topic, this can cause confusion (which log belongs to which computer, and so on).

 

When spam is being sent out, and the computer seems clean, the most important thing is to make sure the email password(s) is changed and a strong password is used (containing uppercase/lowercase letters, numbers in random order).  

 

The provided logs are clean.


regards, Elise


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#5 Skyline969

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Posted 01 May 2013 - 04:01 PM

Thank you for your assistance Elise. I am going to change their passwords and remove their IP from the blacklist. In the future I will refrain from working on multiple machines in one topic, and instead I will create multiple topics (one per machine).

 

What struck me as odd is, if their accounts were compromised (password was known to a malicious party) our logs would've indicated that the spam was being sent from their account, but also from a remote IP address unless the spammer was coming from the same IP which is highly doubtful. Nonetheless, I think it would be a good idea to change their email passwords. Thanks again for analyzing the logs. If the issue persists, would you rather have me reply to this topic or create a new one?



#6 Elise

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Posted 02 May 2013 - 01:00 AM

I'd appreciate it if you could let me know here in this topic as I'm subscribed now. :) If you don't need further assistance this topic will be closed.


regards, Elise


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#7 Skyline969

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Posted 03 May 2013 - 02:46 PM

It looks like we're good to go! I removed their blacklist entry on our servers after changing their passwords, and so far we haven't had an issue. Thank you for your assistance.



#8 Elise

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Posted 03 May 2013 - 03:18 PM

I'm glad to hear that and you're most welcome. :)


regards, Elise


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#9 Elise

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Posted 03 May 2013 - 03:18 PM

It appears that this issue is resolved, therefore I am closing the topic. If that is not the case and you need or wish to continue with this topic, please send me or any Moderator a Personal Message (PM) that you would like this topic re-opened.

regards, Elise


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